IMIESA October 2019

www.infrastructurenews.co.za

IMESA The official magazine of the Institute of Municipal Engineering of Southern Africa

i n f r a s t r u c t u r e d e v e lo p m e n t • B u i l d i n g • M a i n t e n a n c e • s e rv i c e d e l i v e ry

INDUSTRY INSIGHT

Energy

Run-of-river hydropower in the DRC

Always staying ahead

Dinesh Chaithoo Managing Director, Chaithoo

entsika making a difference by investing in technical excellence IN THE HOT SEAT We have created an independent R&D Department, which works closely with Much Asphalt and other AECI companies, to expand our expertise and explore new markets.” Eddie Jansen van Vuuren General Manager, SprayPave ISSN 0257 1978

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INSIDE

volume 44 no. 10 October 2019

www.infrastructurenews.co.za

IMESA The official magazine of the Institute of Municipal Engineering of Southern Africa

ROADS & BRIDGES Setting the PG standard

I N F R A S T R U C T U R E D E V E LO P M E N T • B U I L D I N G • M A I N T E N A N C E • S E RV I C E D E L I V E RY

INDUSTRY INSIGHT

Energy

Regulars

Run-of-river hydropower in the DRC

Always staying ahead

Dinesh Chaithoo Managing Director, Chaithoo

Editor’s comment President’s comment Africa round-up Index to advertisers

entsika

Making a difference by investing in technical excellence

IN THE HOT SEAT We have created an independent R&D Department, which works closely with Much Asphalt and other AECI companies, to expand our expertise and explore new markets.” Eddie Jansen van Vuuren General Manager, SprayPave ISSN 0257 1978

Hydropower 3 5 12 79

Cover Story

making a difference by investing in technical excellence

6

Run-of-river hydropower in the DRC

44

Water & Wastewater Introducing Nafasi Water Optimising the treatment process The power of anaerobic digestion The uMkhomazi Water Project Addressing vulnerabilities

49 51 53 54 56

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Hot Seat

Expanding its range of capabilities year-on-year, Entsika Consulting Services now offers the market a multidisciplinary and integrated range of services encompassing engineering and construction, plant infrastructure asset management, consulting, internal auditing, training and skills development, and enterprise development. P6

Perfecting the grade

10

Industry Insight Always staying ahead

14

Roads & Bridges Start with the best lifetime option 16 Embracing the future today 19 Mogale City Junior Traffic Training Centre gets a revamp 20 Plastic paves the path to new roads 22 Sabita member listing 25 Engineering world-class routes 27 Setting the PG standard 28 A green and versatile course layer 31

Rehabilitating a critical airstrip

32

Partners in Infrastructure Embracing change and innovation Economic lull harming transformation

IN THE HOT SEAT

34 37

Ammann’s strategic focus on SMMEs ELB is Ammann’s best compaction dealer

Specialised water storage solutions Keeping urban dams clean and safe

59 60

Construction Law Practical solutions to avoid conflict and disputes in construction contracts 62

Pipes, Pumps & Valves Take a look inside your pipes Optimising multistage performance Relief for drought-stricken Sutherland Debunking the myths around HDPE mechanical joining

65 67 69 71

Human Settlements 72

Waste Management Old landfills – a resource tank waiting to be unlocked?

Landfill ban presents opportunities

75 77

Cement & Concrete

Transport, Logistics, Vehicles & Equipment

SprayPave’s 360-degree approach to customer service, quality and product innovation positions the company for sustained growth in the local and cross-border markets. General manager Eddie Jansen van Vuuren talks about current capabilities and future plans. P10

Dams & Water Storage

Housing as urbanism

Runways

44

28

39

Floors that don’t crack A solid foundation for growth Simplifying large tile adhesion

78 78 79

41

Environmental Engineering Going green with gabions

69

Hydropower Run-of-river hydropower in the DRC

42

Pipes, pumps & valves Relief for drought-stricken Sutherland

INDUSTRY INSIGHT

14 The days of consulting engineering firms simply offering a design and construction management service are rapidly being replaced by the demand for a new, multifaceted skill set that embraces technology and the community.

Dinesh Chaithoo, managing director of Chaithoo, shares his perspective.

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EDITOR’S COMMENT MANAGING EDITOR Alastair Currie SENIOR JOURNALIST Danielle Petterson JOURNALIST Nombulelo Manyana Head OF DESIGN Beren Bauermeister Chief SUB-EDITOR Tristan Snijders ContributorS Nico-Ben Janse van Rensburg, Randeer Kasserchun, Neeraj Mannie, Natalie Reyneke, Peter Townshend, Brendon van Niekerk CLIENT SERVICE & PRODUCTION MANAGER Antois-Leigh Botma Production COORDINATOR Jacqueline Modise financial MANAGER Andrew Lobban BOOKKEEPER Tonya Hebenton DISTRIBUTION MANAGER Nomsa Masina Distribution coordinator Asha Pursotham SUBSCRIPTIONS subs@3smedia.co.za Printers Paarl Media KZN +27 (0)31 714 4700 ___________________________________________________

Forging a common vision

E

stablishing a common vision for the South African construction market is now more essential than ever, given a continued lag in fortunes for this vital sector. I regularly attend conferences where public and private sector leaders share the stage, but often appear to do so in isolation from each other.

Government has its mandate; business has theirs – and both assume the other side understands and embraces the same priorities. But clearly that’s not the case.

For example, public bodies express their unhappiness about the pace of socio-economic transformation, while the construction sector decries the lack of infrastructure investment, challenges the protracted tender process, and points to the constant job losses being experienced in the sector. Communication and the playing of open cards are the key, especially in segments like construction and mining, which play such a critical role in shaping South Africa’s GDP. Overall, South Africa’s economy remains in positive territor y, as indicated by the recent Q2 GDP data released by Stats SA. These GDP results showed an unexpectedly positive upturn, increasing by 3.1%. Q2 also saw a 6.1% improvement in gross fixed capital formation, following five consecutive dips. Machiner y and equipment imports were among the key contributors, partly influenced by a more buoyant mining and quarr ying industr y. The latter’s contribution rose by 14.4%, accounting for 1% of GDP. Sadly, the construction industr y’s role in the mix remained in negative territor y, with this sector only contributing -0.1% and contracting by 1.6%. This is the fourth successive quarter-on-quarter contraction.

According to Trading Economics, South African construction’s historical contribution

Advertising Sales key account manager Joanne Lawrie Tel: +27 (0)11 233 2600 / +27 (0)82 346 5338 Email: joanne@3smedia.co.za ___________________________________________________

Publisher Jacques Breytenbach Novus Print (Pty) Ltd t/a 3S Media 46 Milkyway Avenue, Frankenwald, 2090 PO Box 92026, Norwood 2117 Tel: +27 (0)11 233 2600 www.3smedia.co.za Annual subscription: R600.00 (INCL VAT) ISSN 0257 1978 IMIESA, Inst.MUNIC. ENG. S. AFR. © Copyright 2019. All rights reserved. ___________________________________________________ IMESA CONTACTS HEAD OFFICE: Manager: Ingrid Botton P.O. Box 2190, Westville, 3630 Tel: +27 (0)31 266 3263 Email: admin@imesa.org.za Website: www.imesa.org.za BORDER Secretary: Celeste Vosloo Tel: +27 (0)43 705 2433 Email: celestev@buffalocity.gov.za EASTERN CAPE Secretary: Susan Canestra Tel: +27 (0)41 585 4142 ext. 7 Email: imesaec@imesa.org.za KWAZULU-NATAL Secretary: Ingrid Botton Tel: +27 (0)31 266 3263 Email: imesakzn@imesa.org.za NORTHERN PROVINCES Secretary: Ollah Mthembu Tel: +27 (0)82 823 7104 Email: np@imesa.org.za SOUTHERN CAPE KAROO Secretary: Henrietta Olivier Tel: +27 (0)79 390 7536 Email: imesasck@imesa.org.za WESTERN CAPE Secretary: Michelle Ackerman Tel: +27 (0)21 444 7114 Email: imesawc@imesa.org.za

to GDP peaked at around R110.1 billion in Q4 2016 and stood at approximately R106.4 billion in Q2 2019. Although this seems like a sizeable number, it will need to grow significantly if we want to sustain our industr y and grow South Africa as a major trading nation.

For South Africa to succeed, it has to restore the trust that’s been lost between the public and private sector. This is especially the case when it comes to late payments that have forced both larger and smaller construction companies to close their doors. Continued underspending of approved infrastructure budgets is another compounding factor. So if the current government procurement model isn’t working, let’s change it. Then we can effect real socioeconomic transformation.

As taxation revenues shrink, it, in any case, seems inevitable that private sector infrastructure funding will become an increasingly important part of the mix in sustaining the industr y. That, of course, needs to be in alignment with government strategy.

The local and international appetite for public sector investments will depend on how current and future debt is leveraged, as well as the cost of borrowing.

That depends on clearer policy certainty. A silo approach isn’t going to work.

Alastair

FREE STATE & NORTHERN CAPE Secretary: Wilma Van Der Walt Tel: +27 (0)83 457 4362 Email: imesafsnc@imesa.org.za All material herein IMIESA is copyright protected and may not be reproduced either in whole or in part without the prior written permission of the publisher.

The views of the authors do not necessarily reflect those of the Institute of Municipal Engineering of Southern Africa or the publishers. _____________________________________________ Novus Holdings is a Level 1 Broad-Based Black Economic Empowerment (BBBEE) Contributor, with 135% recognised procurement recognition.

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urenews.co

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Infrastructure News

IMESA magazine The official of the Institute Engineerin g of Municipal Africa of Southern

INFRASTR

E V E LO P M UCTURE D

LDING ENT • BUI

Run-o

ahead Always staying Dinesh Chaithoo Director, Managing

NA • MAINTE

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Cover opportunity

Ener gy

IND UST RY T INSIGH

ower f-river hydrop

in the DRC

In each issue, IMIESA offers advertisers the opportunity to get to the front of the line by placing a company, product or service on the front cover of the journal. Buying this position will afford the advertiser the cover story and maximum exposure. For more information on cover bookings, contact Joanne Lawrie on +27 (0)82 346 5338.

Chaithoo

entsika

rence making a diffe l excellence g in technica

by investin

SEAT

Much closely with ent, which works ent R&D Departm and explore an independ our expertise We have created s, to expand SprayPave other AECI companie General Manager, Asphalt and van Vuuren 5.00 Eddie Jansen 019 • R5 October 2 new markets.”

IN THE HOT

1978 ISSN 0257

• 4 No.10 Vo l u m e 4

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IMIESA October 2019

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President’s comment

IMESA

Analysis and execution Asset management is a critical discipline for municipal managers and engineers, especially when it comes to infrastructure maintenance and service delivery. It begins with the establishment of an asset register and thereafter tying this into a planning and project management tool.

B

udget information needs to be included, along with timelines and allocated costs for routine inspections, maintenance and upgrades. Then everyone needs to know their job within the matrix and make sure it’s executed correctly for the whole system to work.

Although an obvious and internationally benchmarked practice, and a requirement in terms of South African legislation, a number of our municipalities are still falling short in these areas. In some instances, asset management registers and systems are either not in place or have not been updated for years.

Without accurate data, this means some municipalities are operating blindly and without precise knowledge of their ageing assets.

In the absence of systematic conditioning monitoring, essential predictive maintenance practices are not in place. Maintenance then becomes reactive when sudden failures occur, like a pipeline burst or a substation fire. Even worse, without accurate assessments, there could be a potential health and safety risk, such as a bridge collapse or sewage spillage.

Getting the numbers right is the responsibility of the accounting officer and municipal manager. There has to be a clear financial and risk management strategy, with provision made for future expenditure. At the operational end, it’s equally vital that municipal engineers are equipped with the right tools to assess,

measure, monitor and report back to a central decision-making task team.

AMPLE approach Around 2012, IMESA had already identified the need for asset management training as an essential skill set. Thanks to an agreement concluded with GHD’s Global Assessment Group, IMESA was granted a licence to use the AMPLE tool suite. AMPLE stands for Asset Management Programme Learning Environment and is designed as an e-learning package.

There are three levels, starting with an introduction to the subject and transitioning to the ultimate stage. The end goal is to become a master tactician: providing world-class service delivery at the lowest life-cycle cost.

We believe AMPLE is an excellent tool that will simplify the development of your sustainable asset management strategic plans. It can be accessed via our website (at www.imesa.org.za/asset-management-2).

There are a few details that need updating, but the learning modules are all ready for use now.

Although it’s designed to be a self-learning package, we understand the benefits of having expert instruction and support. In response, IMESA will be rolling out regional AMPLE workshops in 2020, running alongside our growing series of industry-specific training courses.

More benefits for IMESA members

online membership system, which is expected to go live before the end of 2019.

Members will be able to update their contact details and access member-specific facilities being developed. Online services will include event registration, for branch meetings and workshops, and the ability to track individual IMESA CPD activities. We also plan to include news and forum pages. Affiliate members will also be featured.

Moving forward, IMESA remains committed to empowering municipal engineers so that they can fulfil their role as essential change agents. We need to protect our assets.

Randeer Kasserchun, president, IMESA

Allied to this, we are currently working on a full

IMIESA October 2019

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Cover story

Entsika - Making a difference

by investing in technical excellence Expanding its range of capabilities year-on-year, Entsika Consulting Services now offers the market a multidisciplinary and integrated range of services encompassing engineering and construction, plant infrastructure asset management, consulting, internal auditing, training and skills development, and enterprise development. They all work together to ensure seamless project and service delivery.

A

n Auditor General (AG) media release, published on 26 June 2019, flagged a lack of accountability as the major cause of poor local government audit results and the report lists a number of main indicators for the deteriorating accountability during the year under the review – one being the “shortcomings in the development and maintenance of infrastructure”. These included the underspending of grants, delays in project completion, and non-compliance with supply chain management legislation.

The AG cited as a key concern “the lack of attention paid to water and sanitation infrastructure”.

He said the condition of water and/or sanitation infrastructure was not assessed by 32% of the municipalities responsible for water and sanitation; and almost half did not have policies for maintenance. Furthermore, the AG found that 39% of the municipalities that disclosed their water losses reported losses of more than 30%, resulting in an overall loss of R2.6 billion.

The AG also highlighted that the maintenance of roads did not receive the necessary attention, with the condition of roads not being assessed by 23% of the municipalities responsible for roads and 41% not having a road maintenance plan.

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IMIESA October 2019

COVER STORY

Quoting directly from the AG’s media release, “These findings indicate major shortfalls in fiscal discipline, maintenance planning and project execution,” says Clifford Makoloane, director, Entsika. “The upside is that they also open the door to new business opportunities for contractors as municipalities weigh up the benefits of outsourcing operations and maintenance management to specialist engineering service providers.”

Entsika is a Level 1 BBBEE Contributor and is a black-owned and -managed business. It was founded by professionals with extensive experience in plant infrastructure asset management (maintenance management), consulting, internal auditing, training and skills development, enterprise development, as well as engineering and construction.

Entsika has delivered on various large projects at both national and local levels. These include water and wastewater pump station maintenance, asset and infrastructure management, water conservation and water demand management, Green and Blue Drop, and water quality management projects. Other projects completed or in progress include process improvement projects, verification of property rates and taxes arrears across 133 municipalities, asset and expenditure verification, and the installation and equipping of boreholes. Entsika works with leading organisations such as the Department of Public Works, Department of Rural Development and Land Reform, Department of Social

Development, Rand Water, and ERWAT, to name a few.

Investing in people Entsika’s technical excellence success hinges on its people. The company employs more than 60 field-proven experts in its Asset Management (maintenance management), and Engineering and Construction divisions. They comprise mechanical, electrical and civil engineers, as well as qualified artisans. In conjunction with TVET colleges, Entsika’s skills programmes train, develop and qualify a growing pool of fitters and turners, electricians, and instrumentation specialists, supported by semi-skilled and assistant workers who are being mentored to grow into any one of these fields.

Growth areas The asset and infrastructure management side of the business is undergoing rapid expansion, with a niche focus on the water, wastewater,

mining and power sectors. Central to Entsika’s future growth strategy is the expansion of its engineering and construction capabilities.

Entsika is currently graded as an 8MEPE, 5EPPE, 6CEPE, and 1GBPE contractor in terms of the Construction Industry Development Board system. The business, in all areas, serves the Southern African region, for both private and public sector clients.

Entsika has set its sights on business expansion in the water and wastewater segment by providing specialist O&M services to clients, helping them manage their infrastructure assets across the mechanical, electrical, instrumentation and civil disciplines.

“Infrastructure such as electrical equipment, roads, water and wastewater systems are ageing, and their maintenance should be placed as a high priority on the strategic and operational plans of municipalities,” says Makoloane. “It’s one of the keys to sustainable development and economic growth within the country.”

The benefits of infrastructure maintenance are that it: • k eeps infrastructure operational and delivering services • creates sustainable jobs • saves costs in the long term, and often in the short term as well • will ensure that more funds for new infrastructure will be available in the future.

OEM partnerships Entsika – in partnership with key OEMs that include Xylem, a leading US-based multinational – installs and services OEM submersible pump systems, including associated equipment and/or components for both public and private sector clients in the water and wastewater segments.

Entsika believes that the private sector has much to offer in the maintenance of infrastructure and that it can be given the opportunity to do so through the establishment of strategic partnerships in terms of service level agreements (SLAs) between government institutions, including municipalities.

SLAs are important to ensure the maintainability, availability and reliability of

Entsika membership and accreditations:

Partnering with:

IMIESA October 2019

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Cover story existing and future infrastructure, ensuring sustainable service delivery provision at all times. To top it off, such SLAs have the potential to encourage further investment and stimulate job creation, locally, provincially and nationally.

Bespoke services Entsika provides asset management services that are tailor-made in collaboration with its clients across all industry sectors, and the company assists them to: • maximise operational availability and reliability through the application and execution of sustainable asset management practices • identify, review and develop asset management strategies, plans, processes and practices, and implement them organisation-wide to achieve maximum long-term operational availability and reliability • review and optimise the management of assets in line with operational objectives and targets.

Entsika believes that effective and efficient asset maintenance execution is one of the tools to optimise operations without compromising the safety, health, environment and quality of the organisation.

Its maintenance team has the capacity to meet the asset maintenance needs of any client. Services include the following: • asset maintenance planning and scheduling of preventative, corrective and predictive (condition-based) maintenance tasks • asset maintenance execution in terms of servicing, repairs and refurbishment of mechanical, electrical and instrumentation equipment and machinery, including facilities maintenance • asset maintenance spare parts and inventory management • development of asset maintenance strategies and plans

• refurbishment of equipment and machinery, such as pumps, motors, valves, gearboxes, to name a few • performance monitoring and reporting (i.e.

KPAs/KPIs) • safety management in terms of the Occupational Health & Safety Act (No. 85 of 1993) requirements.

The company provides a comprehensive, full-service package to asset owners to fully or partly outsource the maintenance of their assets. Furthermore, the company also collaborates and partners with other likeminded service providers such as the likes of Electrical and Pump Centre, that possesses excellent technical skills in the repairs of pumps, motors and gearboxes amongst others, using advanced designs and modern techniques.

Engineering and construction Entsika’s Engineering and Construction Division provides a wide range of mechanical, electrical, instrumentation and civil engineering services across all industry sectors. These include: • the design, supply, installation, construction and commissioning of plant, equipment and machinery, including the provision of technical assistance to client staff • civil works, which includes the construction, upgrading and rehabilitation of roads, stormwater infrastructure, paving of streets, bridge construction, including mass earthworks and geotechnical surveys • general building works, which includes foundation and geotechnical works, various brick works, concrete works, paving, roofing, and plumbing works associated with residential and commercial buildings • r e-engineering and refurbishment of equipment, machinery and facilities • project management services on any turnkey engineering and construction project, including feasibility studies, project scoping, planning and scheduling, as well as material procurement and quality management, just to name a few.

Minecrete-S3 Furthermore, Entsika, in partnership with South African Mining & Engineering Supplies, provides a product named Minecrete-S3 as an alternative solution to existing and/or new civil infrastructure works. Clients can reduce their shotcrete application by half with Minecrete-S3.

This product can be used for sealing of existing waterways, roadway structures, water canals and damage associated with water flow, among other applications.

Some of the key features of MineCrete-S3 are as follows:

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IMIESA October 2019

ENTSIKA FOUNDATION Through the Entsika Foundation, the group is committed to rebuilding and developing South African society and making a long-lasting impact.

These initiatives include community development by providing mentorship programmes and supporting young people to become great leaders.

Entsika strives to contribute towards alleviating poverty in the country and make a long-lasting difference. The company embraces social development not because it is compelled to, but because it is driven by a desire to make a difference!

This entails: • education of children with disabilities • youth development through awarding of bursaries and mentorship programmes • provision of school uniforms to disadvantaged learners • construction of schools in previously disadvantaged areas • provision of food security for childheaded families and the impoverished in rural areas and townships.

• Minecrete-s3 is a super strong shotcrete with excellent bond and water permeability characteristics.

• Minecrete-s3 is a quick cure product, achieving up to 70% of its total strength after one day.

• Minecrete-s3 is a 100% water sealing product.

• Minecrete-s3 has excellent energy absorption strengths of 915 J in 24 hours for ground movement.

“Proper maintenance of water and wastewater infrastructure is critical to the long life and safe operation of plant and equipment, and Entsika is committed to making a difference by providing municipalities with a comprehensive infrastructure maintenance proposal,” says Makoloane.

“That will also address service delivery challenges, without compromising on the safety, health, environment and quality of the assets and/or plant,” he concludes.

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Creating Concrete Possibilities

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GREAT ROADS START HERE

Hot Seat

Perfecting the grade SprayPave’s 360-degree approach to customer service, quality and product innovation positions the company for sustained growth in the local and cross-border markets. IMIESA speaks to general manager Eddie Jansen van Vuuren from all of our branches. We do have other products under about current development, but can’t give capabilities and anything away just yet. immediate assurance future plans. of quality.

What does SprayPave offer the roads industry?

EJvV SprayPave’s mission is to be the preferred supplier and distributor of quality bitumen binders in South Africa.

We create value for our customers by integrating innovative people with technology to supply a comprehensive range of fit-for-purpose, SABS-approved products to suit different road designs. Our on-site laboratories allow for the issuance of product test result certificates prior to dispatch, giving the customer

A SprayPave tanker at work

10

IMIESA October 2019

The SprayPave fleet, managed and maintained internally, offers an additional delivery and application service. We have 11 tankers in our bitumen distribution fleet, equipped with the Etnyre spraying system, which can spray anything from emulsions and cutback to penetration grade and homogeneous modified bitumen.

Four 29 t capacity bitumen haulers move products internally and externally.

Do you have any new products on the market?

We recently started manufacturing a highly modified crack seal called Opti-Crackseal.

This new product line is available to the road maintenance industry

What are the most important changes you’ve made in the past year?

Technology has been one of the most significant improvements at SprayPave in terms of capabilities and output volumes.

We have created an independent R&D Department, which works closely with Much Asphalt and other AECI companies, to expand our expertise and explore new markets. The key focus in the 2019/20 period is new product R&D, including capital investment in test equipment.

Customer service has also been a key focus area, which has been improved by employing expert sales representatives at our three branches. A new SMS update service is working well

Eddie Jansen van Vuuren, general manager, SprayPave

to keep customers informed on the progress of their orders.

Customer feedback is vital for continuous improvement. We interact with our customers on a quarterly basis through customer surveys.

At SprayPave, our goal is zero harm. We aspire to operate sustainably, without harm to people, the environment and the communities in which we operate. We recently adopted the AECI SHEQ framework, which is our standardised approach to managing risk and improving SHEQ performance.

How do you add value to the capabilities of the Much Asphalt group?

SprayPave provides in-house

Hot Seat

Lusanda Jele, branch administrator (left), and Angel Gumede, production supervisor, show their solidarity with the Zero Harm Safety Pledge at SprayPave’s Durban branch

solutions to Much Asphalt in the form of polymer modified bitumen (PMB) and a range of bitumen grades that are unavailable to the market from the local refinery.

The latter capability comes in the form of a multistage bitumen converter acquired from Technix Industries in New Zealand in 2017. This enables SprayPave to convert bituminous products from one grade to another and, therefore, enhance the penetration grades of bitumen required for asphalt production.

Bitumen is produced by refineries as a by-product of crude oil, but can only be supplied in broad grade ranges that seldom meet asphalt design specifications.

Danashia Padayachee, technical manager at SprayPave, tests a sample produced by the multistage bitumen converter

Our 20 tph converter operating in Cape Town uses pressure, heat and air to precisely convert bituminous products in a way that is predictable and repeatable. Various properties of the bitumen – including softness, penetration index and physical properties – can be changed to exact design specifications.

How has the bitumen converter technology impacted your business and the industry?

Output from the converter has steadily increased since 2017.

As this was only the second unit to be commissioned worldwide, the technology presents a learning curve and offers new avenues that are yet to be explored.

Bitumen supply is unfortunately always a sore point, as the incoming material to the converter is still bitumen, albeit a softer grade. However, the

About SprayPave SprayPave has manufacturing facilities in Gauteng, Durban and Cape Town and is a wholly owned subsidiary of Much Asphalt – Southern Africa’s largest commercial supplier of asphalt products.

converter has certainly helped to mitigate the shortage of supply of penetration grades of bitumen required by the asphalt industry.

While multigrade bitumen is still in the development stage, the converter is able to make SABS-approved 50/70, with a certification process under way on the 35/50 bitumen grade.

has also been commissioned recently in KwaZulu-Natal.

High shear mills have been installed at the Durban and Alrode facilities to produce high-quality PMB. PMB improves strength, cohesiveness and fatigue resistance to withstand heavy-duty traffic and extreme weather.

Can you comment on upgrades to your plants?

Do you have plans for expansion?

There have been several plant upgrades at SprayPave’s branches across the country and a new mobile emulsion plant is now based in Polokwane. A state-of-the-art emulsion mill

Yes, the acquisition of Much Asphalt by AECI in 2018 has opened up opportunities in other markets locally and across borders. We believe we can benefit from AECI’s extensive footprint and experience on the continent. Watch this space.

The mobile emulsion plant in Polokwane also provides good opportunities to expand our footprint. For customers in Africa who require drummed products, SprayPave’s mobile decanting plants and static tanks ensure that hot bitumen is always available in the quantities determined by the project.

www.spraypave.co.za

IMIESA October 2019

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INFRASTRUCTURE NEWS

FROM AROUND THE CONTINENT

$349 billion

SA alone needs more than $349 billion to reach 2050 national climate goals

Southern Africa Boosting climate investments The Development Bank of Southern Africa (DBSA) and the Green Climate Fund (GCF) have signed an agreement that will launch a programme to accelerate investments into climate projects and break market barriers.

The agreement seals the GCF’s investment of US$56 million (R837 million) into the DBSA’s Climate Finance Facility (CFF), a first-of-its-kind climate finance facility in Africa using a pioneering green bank model. The programme will target South Africa, Namibia, Lesotho and eSwatini, but has a strong potential to be replicated in other developing countries to rapidly scale up private sector climate investments.

The CFF will break existing market barriers to climate financing by providing credit enhancements such as subordinated debt tranches and tenor extensions to de-risk and increase the bankability of climate projects, in order to crowd in significant investments from commercial banks and project sponsors.

“Climate change is a severe and growing threat that affects Africa’s economies, natural resources, livelihoods and social stability. The signing of this agreement today is a significant milestone that

Ethiopia Corridor Project to kick off in 2020 Ethiopia has secured finance for Phase 1 of the Ethiopia-Djibouti Road Transport Corridor Project.

The total cost of the project is US$255 million (R3.36 billion), comprising an African Development Fund (ADF) grant of $98 million (R1.46 billion) to the government of Ethiopia, an ADF grant of $5.3 million (R79.2 million) to the government of Djibouti and a co-financing contribution of $151 million (R2.26 billion) by the government of Ethiopia.

The project will kick off in 2020 and be implemented over a five-year period. The project consists of the construction of the

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IMIESA October 2019

The Ethiopia-Djibouti Road Transport Corridor Project will kick off in 2020

represents our concerted effort to address climate change and contribute to the broader low-carbon and resilient development trajectory in Southern Africa,” says Patrick Dlamini, chief executive, DBSA. “The CFF will enable the DBSA to increase our finance support to climatefriendly projects in the region and crowd in private capital investors.”

Southern Africa is exceptionally susceptible to the adverse effects of climate change, such as extreme droughts and rainfall fluctuations. Moving national economies away from fossil fuels, which still dominate the energy mix in the region, will come at a high price. It is estimated that in South Africa alone, more than $349 billion (R5.22 trillion) will be needed to reach national 2050 goals established in the country’s Nationally Determined Contributions.

first 60 km of a four-lane expressway section of the new 126 km stretch from Adama to Awash, and includes the design of a onestop border post at Dewele.

The project will enhance trade by significantly reducing transport costs, thereby accelerating the economic growth of Ethiopia and its neighbour Djibouti, as it is part of the main import-export corridor.

The expressway is expected to improve access to markets for farmers and rural communities. Other beneficiaries include some 3 000 truck drivers who work the 900 km between Djibouti and Addis Ababa, and youths, who will receive over 95% of the job opportunities during the construction phase.

350 km

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Once complete, Pwalugu Dam will have a maximum reservoir area of 350 km2

Ghana Green light for Pwalugu Dam Construction works on Ghana’s multipurpose dam at Pwalugu are set to begin in November this year.

The construction of the dam has become crucial as a result of annual floods and deaths in the areas within the flow-way of the Bagre Dam from upstream Burkina Faso. According to officials of the Upper East Region, 7 488.94 ha of farms were destroyed by floods as livestock were carried away in the waters in 2018.

Sensitisation and evacuation plans have already begun in the Pwalugu flood area, following plans by the Burkinabe authorities to open the dam in a few days.

The dam will supply water to communities in the catchment area and comes with a 25 000 ha irrigation scheme expected to increase food production. The project will also include a solar component to balance hydroelectricity with solar power to enhance the reliability of power supply.

Once complete, the multipurpose Pwalugu Dam will have an elevation of 165 m, near the Pwalugu Bridge on the White Volta River, and a maximum reservoir area of 350 km2. The project will also have a powerhouse consisting of two turbines with 60 MW of installed capacity and 16.5 MW of firm continuous capacity, as well as 15 km of overhead lines.

Among other benefits, the dam will reduce the cost of power distribution to the northern regions of Ghana while improving industrialisation, modern commercial agriculture and value chain activities, as well as the general socioeconomic environment. The construction phase is also expected to create thousands of jobs.

Mali Rolling out rural renewable energy Mali has received an additional US$22.7 million (R339.2 million) in financing for the Mali Rural Electrification Hybrid System Project, which aims to improve access to modern services and promote the deployment of renewable energy in rural areas.

The overall project is expected to benefit approximately 760 000 people, including households, businesses and community service facilities that are connected to mini-grids. The grant will also support the installation of solar home systems in households not living within the vicinity of a mini-grid, the deployment of solar lanterns, and the delivery of communication and awareness-raising campaigns in targeted areas.

“By introducing lower-cost financing for renewable energy generation in rural areas, the project contributes to reducing the cost of providing affordable and reliable electricity services, facilitates the expansion of energy access, and strengthens Mali’s rural electrification business model,” said Charles Joseph Cormier, practice manager: Energy and Extractives Global, World Bank.

Senegal Supporting agriculture through water supply development The government of Senegal has been granted a €87 million (R1.427 billion) loan by the African Development Bank (AfDB) to implement its Project to Improve the Water Supply for the Development of Value Chains (Provale-CV).

The project, which is valued at an estimated €122 million (R2 billion), aims to sustainably increase agricultural production, employment and incomes in rural areas through the use of surface and underground water. It comprises the management of 12 730 hectares,

760 000

The Mali Rural Electrification Hybrid System Project will benefit 760 000 people

including 7 950 hectares fed by retention dams, 3 980 recovered hectares, 800 hectares of boreholefed market gardens, production roadways, warehouses and pastoral infrastructure.

This project will have a direct impact on 38 000 households, or about 300 000 people. The actions planned for the project will help create 28 000 decent jobs, 30% of which will be for women and 40% for young people, together with an average increase in earnings from agricultural production of around €1 520 (R24 938) per beneficiary.

Developed with the support of the AfDB, Provale-CV is the first project under Senegal’s small-scale Local Irrigation National Development Programme. It operates in three agro-ecological areas in the country – Les Niayes, the Groundnut Basin and Casamance – and covers eight administrative regions: Kaolack, Fatick, Kaffrine, Diourbel, Thiès, Ziguinchor, Sédhiou and Kolda.

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Industry INSIGHT

Always staying ahead The days of consulting engineering firms simply offering a design and construction management service are rapidly being replaced by the demand for a new, multifaceted skill set that embraces technology and the community. Dinesh Chaithoo, managing director of Chaithoo, shares his perspective.

Dinesh Chaithoo, managing director of Chaithoo

F

ounded in 2013, Chaithoo is a visionary consulting engineering, project management and transactional advisory leader committed to bridging the skills and infrastructure gaps faced in South Africa and Africa. This vision is based on years of experience, which have proven what works best in theory and in practice.

In refining its capabilities, Chaithoo has supported this approach by recently attaining ISO 9001:2015 accreditation. That ensures that every process implemented by the company has a systematic and verified execution model.

The company is focused on local and international expansion. Within South Africa, projects include design services for road and bridge infrastructure, combined with asset management condition assessments, geotechnical studies, bankable feasibility analysis for public-private partnership initiatives, forensic infrastructure reports, and renewable energy proposals.

Key services - Consulting engineering - Project management - Transaction advisory services - Training and development

Recent local project examples include the design and construction of a new Gauteng river bridge and the demolition of the old one at an approximate value of R30 million. The existing low-level river bridge was under-designed in terms of its hydraulic capacity, resulting in overtopping during flood conditions.

Also in 2019, Chaithoo concluded a comprehensive asset management and bridge condition assessment for the City of Ekurhuleni.

A total of 171 bridges were assessed, with an in-house geographic information management system developed for this purpose.

Past work within this metro includes assisting project owners for the Ekurhuleni Gravel Roads project, where roads were upgraded in areas such as Etwana, Leachville, Daveyton and Watville.

“Providing accurate reports on ageing transportation infrastructure is vital in terms of assessing future capex budgets for new construction and maintenance. It’s also a major safety consideration,” Dinesh

explains. “These are all areas where we have extensive experience.”

Demonstrating its project flexibility, Chaithoo also works extensively in the property development sector. Past examples include the City of Tshwane’s 400 unit Akasia Place social housing development.

Cross-border market Cross border, one of Chaithoo’s major strategic moves has been its registration of a company in Cameroon. Key developments to date have focused on providing transactional advisory services for government departments in the country.

This includes the groundwork for the country’s hosting of the Africa Cup of Nations in February 2020.

In Botswana, Chaithoo also provided the transactional advisory services for the Botswana Green Housing Solution initiative, which is investigating the widespread adoption of rooftop solar power.

“Across Africa, renewables and cogeneration are the future, and in both respects there are abundant resources,” he asserts.

Another African market with great potential is Mozambique, where Dinesh sees growth in the transportation, mining and allied industrial sectors.

“The cyclone events that swept through Mozambique

Industry INSIGHT

AWARDS - Acquisition International | Leading Advisor Awards 2018 - Advisory Excellence 2019 Winner - ACQ5 Global Awards 2019: • South Africa: “Consultancy of the Year (Infrastructure Asset Management)” • South Africa: “Game changer of the Year (Engineering/Consulting)” - Global Law Experts 2019 Winner

earlier in 2019 caused extensive damage to homes and infrastructure,” he says. “In a number of cases, the impact of the storm and ensuing floods was more severe than necessary due to the fact that formal infrastructure was absent. This presents major opportunities to design and construct a range of new services that will add value to their local economy, particularly in the roads and bridges segment.”

Performance-based road contracts A number of these projects will be backed by institutional funding from donor countries, as well as World Bank loans. This has a bearing on which forms of contract are chosen for tender awards. For example, output and performance-based road contract (OPRC) procurement documentation is the preferred route chosen by international agencies.

Dinesh has gained extensive experience with OPRCs while working for a leading multinational consulting firm prior to forming Chaithoo, which included working in Mozambique. Chaithoo is currently in discussions with Mozambique’s roads agency (Administração Nacional de Estradas) to offer transactional advisory services on a range of projects.

“Key OPRC benefits include an emphasis on long-term maintenance and life-cycle road optimisation, with contract obligations ranging up to 10 years,” he explains. “In the right hands, that ensures the best measurable return on investment for public and institutional investors, since contractors and consultants are paid on a performance outcome basis. For this reason, the introduction of OPRCs in South Africa would also make commercial sense.”

Another concept being advocated by Chaithoo is the wider implementation of context-sensitive

design (CSD) transportation methodologies in line with global best practice. CSD encourages full private and public participation, while taking into account environmental, community, historical landmark and socio-economic factors when building or upgrading future road corridors.

In May 2019, Chaithoo was appointed as one of uPhongolo Local Municipality’s panel of planning consultants for a three-year period. The end goal is to assess the current economy in the town of Pongola and make recommendations for its revitalisation as a Northern KwaZulu-Natal economic hub. “Taking a CSD approach will yield the best results,” Dinesh insists.

From a purely stormwater and roads perspective, Chaithoo was also recently appointed to the Kgatelopele Local Municipality’s consulting panel for the period July 2019 to June 2022. In Setswana, ‘kgatelopele’ means progress, and this Northern Cape district recognises the need for advanced infrastructure to make this happen.

Alongside its other specialisations, Chaithoo has identified the geotechnical sector as a key growth market, for both green- and brownfield expansions. Recent projects include foundation investigations for 14 existing private hospitals in KwaZulu-Natal as part of future on-site expansion plans.

Mathematics as a change agent Chaithoo’s technical ability is well-proven, but what makes the company especially unique is its commitment to building future skills capacity in the broader construction sector.

And that has an immediate and more forwardthinking strategy.

Initiatives include the introduction of Chaithoo’s Maths+ Division, which provides an alternative approach to mathematics education at primary and secondary level.

Dinesh is a registered member of Coaches and Mentors of South Africa (Comensa). As defined by its website, “Comensa’s core purpose is to empower coaches and mentors to make a positive contribution to the people of South

Africa.” Dinesh is also a member of AMESA (Association for Mathematics Education of South Africa).

He takes this a step further by actively leading in formal academic engineering education. Dinesh is a lecturer on two key courses in civil engineering at the University of South Africa’s Civil Engineering Department, teaching Geometric Design IV and Foundation Engineering IV. He is also the author of the revised Foundation Engineering IV course.

“Engineers cannot work in isolation. They need to share and communicate their purpose and how it’s achieved. That builds trust and commitment, which is essential when it comes to meaningful service delivery,” Dinesh explains.

“If we want to truly empower individuals and communities, and effect real transformation, mathematics is the critical route for careers in construction and most other industries,” says Chaithoo, who is currently working on a book that demonstrates how students can more simply master complex mental arithmetic calculations.

“Without a solid and practical understanding of mathematics, that will present critical barriers to the essential pipeline of engineers, technologists and engineers needed to build public and private sector capacity,” he continues. “However, if young people embrace and become excited about the subject, there will be a direct and lasting benefit for our economy.”

Chaithoo was a proud sponsor for the 2019 Mathematics Olympiads for the Department of Education – Sedibeng East District, Gauteng.

www.chaithoo.com

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Roads & Bridges

ABOVE Bryan Perrie, managing director, The Concrete Institute LEFT A concrete road under construction

Start with the best lifetime option Concrete roads invariably turn out to be the best economic and community option when thorough life-cycle cost analysis (LCCA) calculations are done to decide between concrete or alternative materials for pavements, says Bryan Perrie, managing director of The Concrete Institute.

A

ll roads authorities and municipalities want to invest in sustainable structures that require only minimal maintenance and offer a high level of ser viceability over the longest possible time. The technical considerations may be decisive when choosing a particular pavement structure, but the choice often depends on economic considerations such as: • expenditure associated with the construction of the infrastructure or the capital cost • budget for subsequent maintenance, preser vation and rehabilitation • economic repercussions of a lack of maintenance, preser vation and rehabilitation operations

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IMIESA October 2019

• economic impact of delays suffered by people and businesses because of traffic jams caused by road works, and reduced availability of infrastructure.

“The initial investment cost is often and misguidedly used as a primar y economic criterion, but this approach can be wrong purely in economic terms if the costs of maintaining the new structure are excessive,” explains Perrie.

“The useful lifetime of a pavement clearly plays an important role and there are mathematical and probabilistic models that can be used to arrive at long-term decisions of this kind in the context of short-term budgetar y restrictions,” he states.

Perrie says an LCCA can help to assess the long-term return of various alternative investment options. In its most

comprehensive form, the LCCA takes account of the costs to both the road owner/manager and road user, and all other relevant costs throughout a pavement’s lifetime for various types of pavement.

In this way, utility owners can arrive at an option with lowest long-term cost, but still with the desired per formance.

Key considerations To assess the whole-life costs, the following aspects need to be considered: • Pavement construction costs: These should include all costs, including agency costs, in administering the project, consultants’ fees for design and super vision, and the contractor’s total costs, including preliminar y and general expenditure, and overheads.

• Pavement maintenance costs: These should include all costs as detailed above for annual routine maintenance, periodic treatment, such as joint resealing and overlaying during the analysis period – and it should be total costs and not only unit rates.

• Residual value of the pavement: This will depend on continued use of the alignment, anticipated condition at the end of the analysis period, feasibility of upgrading or strengthening, or the need to remove the pavement before reconstruction. One approach is to value the contribution the pavement would make at the end of the analysis period to the next life cycle of the pavement.

Roads Roads && Bridges Bridges

Perrie says a sensitivity analysis should be done using different analysis periods and real discount rates reflecting the actual cost of expenditure.

PWOC case study

TOP Concrete works in progress ABOVE Deciding on the optimal road pavement design starts with a life-cycle cost analysis

• Vehicle operating costs and normal travel time costs: These costs tend to increase as pavement condition deteriorates prior to major rehabilitation.

The rate of increase will be different for varied pavement types and strategies.

• Road-user delay costs: These are due to the unavailability of the pavement.

• Pavement construction delay costs: If a pavement is to be placed on an existing

operational road alignment, there is usually some traffic disruption. If the pavement type chosen will affect the duration of the work, the increase in vehicle operating and travel time costs for each alternative should be estimated • Pavement maintenance delay costs: With pavement alternatives that require frequent major maintenance, the road user costs associated with this work may be significant.

• Accident costs: These should only be considered when different pavement types and maintenance strategies may result in pavement deficiencies causing accidents.

“The effect of using inaccurate maintenance costs in an LCCA has already been shown in South Africa. For a rehabilitation contract on the N3 outside Pietermaritzburg, an analysis of concrete and asphalt alternatives using the present worth of cost (PWOC) was carried out in 1984,” he explains.

“The initial costs were based on the average of the three lowest tenders and certain maintenance strategies were assumed. In this analysis, concrete was 18% more expensive than asphalt, but the decision was still made to use concrete for the highway construction.

“In 1998, the actual maintenance costs occurred on the highway over 15 years were used to recalculate the PWOC arrived at in 1984. The results showed that concrete was then only 1.3% more expensive.

This shows the importance of accurate maintenance data when using LCCA to assess various options for pavements,” Perrie adds.

“Often only the construction and maintenance costs – and perhaps the costs of demolition and reconstruction – are considered for such assessments,” he concludes.

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FORWARD-THINKING ROAD INNOVATION

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Delivering value across the pavement lifecycle, we design modular systems that enable multiple data collection sensors to meet and exceed the toughest pavement and asset management specifications.

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Roads & Bridges

Embracing the future today VNA Consulting, a Durban-based and 100%-empowered company, recently acquired a major Australian enterprise and is investing extensively in sophisticated, state-of-the-art pavement strength-testing and road surveying equipment in a drive to remain ahead of the Fourth Industrial Revolution development curve.

T

he Fourth Industrial Revolution brings global high-speed and fundamental technological change in the way people live and work, unlocking the ability of leaders and business to harness convergent technologies, giving effect to a future that is both inclusive and human-centred. The road survey equipment field is no exception to such change and, with rapidly increasing traffic volumes on South African roads, government, municipalities and traffic authorities need the means for ever more effective asset management in order to keep this country’s wheels turning.

Recognising new technological opportunities, VNA Consulting went on the offensive through the acquisition of the equipment assembly and software business of the Australian Road Research Board (ARRB). The move led to the establishment of Automated Road Rehabilitation

Business Systems South Africa (ARRB SA), positioning the new enterprise as a leading road asset management service provider in South Africa, the SADC region and across the globe.

Vikash Narsai, chairman of ARRB Systems SA, says, “The digital age is well and truly here and it affects ever y sector of the economy. We acknowledge that technology is the future and we have today embraced that future – a future driven by speedy, technological breakthroughs and the immense impact new systems have on countries, cities and societies across the world.”

ARRB Systems SA has access to such internationally acclaimed and technologically advanced equipment as the Intelligent Pavement Assessment Vehicle (iPAVe), Intelligent Sur face Assessment Vehicle (iSAVe), Digital Laser Profiler, GipsiTrac Geometry, Hawkeye Onlooker Live and

Hawkeye Processing Toolkit series, as well as the Walking Profiler G3, Roughometer III and IV, and Hawkeye Insight apparatus.

“Through our equipment, we can offer clients the benefits of highly sophisticated and advanced technology, coupled with highly qualified staff, hugely experienced in pavement data collection,” he adds.

Narsai concludes: “We are poised now to grow ARRB SA’s footprint across the countr y, Africa and the developing world, providing roads authorities and pavement engineers with exceptional data and scalable solutions, from which to make informed decisions about road infrastructure maintenance.

With its equipment already used globally to measure the quality of road networks, the company continuously strives to exceed international market standards, while applying the latest product technology trends to meet user requirements.

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The South African Road Federation, together with partners 3M South Africa and Mogale City, is implementing a programme to prioritise road safety at schools in Mogale City. SARF recently facilitated the launch of a Junior Traffic Training Centre.

Mogale City Junior Traffic Training Centre gets a revamp

Mogale City Junior Traffic Training Centre before and after

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IMIESA October 2019

Sponsors of the Mogale City JTTC

Roads & Bridges The Mogale City mayor together with local ward councillors and representatives from Mogale City’s engineering and traffic departments, 3M South Africa and SARF at Tsholetsega Public School

N

elson Mandela once noted that “safety and security don’t just happen. They are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear.”

The South African Road Federation (SARF) has partnered with Mogale City Municipality and 3M South Africa in the Mogale City Child Road Safety Challenge in order to prioritise road safety at schools in the city. The project is funded by the Swiss Fondation Botnar as part of its Botnar Child Road Safety Challenge, which seeks to address locally relevant road safety problems with practical, innovative and evidence-based interventions.

Revitalising the Junior Traffic Training Centre During discussions with Mogale City’s Department of Public Safety, it was discovered that the municipality had an old Junior Traffic Training Centre (JTTC) that had not been used for many years.

In a state of disrepair and not funded by the Botnar Child Road Safety Challenge project, funding was needed to revitalise the JTTC. Basil Jonsson, operations director, SARF, together with Garth Strong from DeltaBloc SA and Garry Savill from SARTSMA

rallied support from the SARF Northern Region members.

George Tekane from the Mogale City Traffic and Security Department approached Mogale City Parks Department to cut the tall grass and remove 22 large tree stumps on the JTTC premises. The municipality also repaired a water seepage problem on the Coronation Street side of the centre.

Much Asphalt supplied the hot-mix asphalt and appointed a subcontractor to repair and repave all the roads at the JTTC, as well as place kerbs around all the roads.

Savill, through SARTSMA members, manufactured and supplied all the traffic signs and special plastic poles, which were erected by the Mogale City Traffic Department teams who also painted all the road markings with road-marking paint supplied by SARF. Mentis supplied fencing, which was erected

by DeltaBloc. The new fence keeps cows and sheep from the nearby farm animal centre out of the JTTC, where they were previously grazing and messing on the JTTC roads.

SARF also supplied paint to repaint the JTTC training venue and palisade fence, and donated 16 wire cars. A further 16 wire cars were donated by Aurecon. Children attending road safety best practice training at the centre will use these cars are part of the learning process.

Mogale City Child Road Safety Challenge The Tsholetsega Public School was the first school to receive road safety upgrades as part of the Mogale City Child Road Safety Challenge.

SARF, Mogale City and 3M conducted infrastructure upgrades around the school, including the construction of raised pedestrian crossings, repainting all the road markings and putting up new traffic signs.

Notably, the team received permission from the Road Traffic Management Corporation (RTMC) to use a new reflective yellow/green ‘School Zone’ sign. This is part of a pilot project that the RTMC will monitor in Mogale City.

A new gate will also be installed at the school to create a safe zone for parents to drop off their children away from the main road.

“Road safety in South Africa is a critical problem and a large percentage of fatal crashes include pedestrians that are children. Children have different mental and physical characteristics that limit their ability to handle complex traffic situations. We need to educate children – learners in schools – about road safety. Too many of our JTTCs in South Africa are now derelict and unusable,” says Saied Solomons, president, SARF. “We would like to thank all of our members who contributed to the Mogale City JTTC and, ultimately, to child safety in the city. Without them, we could not have made this a reality,” adds Jonsson.

Once officially launched by the Mogale City Mayor Naga Patrick Lipudi, the JTTC will provide small-scale simulated road environments where Mogale City traffic officers can teach primary school learners good road safety habits.

A new reflective yellow/green ‘School Zone’ sign is being piloted in Mogale City with permission from the RTMC New raised pedestrian crossing at Tsholetsega Public School

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Roads & Bridges

Plastic paves the path to new roads

In only the second trial ever of recycled plastic asphalt paving to be conducted in South Africa, Shisalanga Construction showed yet again why it is the leading asphalt paving company in the countr y.

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IMIESA October 2019

Roads & Bridges

T

uesday 10 September 2019 saw the gathering of officials and representatives from all major roads authorities in KwaZulu-Natal, as well as from national agencies, to witness a global technology in action. This follows the first road surface trial using this phenomenal plastic paving technology at Shisalanga’s Cliffdale depot in KwaZulu-Natal, By adding recycled plastic generated in South Africa, not only does Shisalanga contribute to reducing a serious waste concern, but its improvement on an international formula achieves at least 6% recycled plastic material content. Recycled plastic has long been used in some international countries, but only recently has Shisalanga Construction introduced this technology into the country.

With the globe suffering from environmental fatigue due to so many different influencing

factors, it is an outstanding achievement by a South African company using local raw material and specifically local recycled plastic to find a way to improve the road surface conditions in our country. A further plus is the use of recycled plastic waste material.

“Our aim is to continue perfecting this technique,” explains managing director Deane Koekemoer. “We have already advanced on international technology in that we have applied a considerably higher percentage of HDPE recycled plastic in our formula – in fact, almost double what some international companies have achieved.

“We see this as the first step of many to supporting our roads agencies to not only continue maintaining our road infrastructure, but to do so in a way that we consider what impact we can have on the environment,” he continues.

“We won’t stop at this point. We have other plans afoot to take this technology and incorporate it into potential community projects, which we trust will not only create employment, but will also improve community road quality,” says Koekemoer.

An expanding footprint Shisalanga Construction, a subsidiary of Raubex Ltd, operates in KwaZulu-Natal and the Eastern Cape, but has plans to grow a broader footprint.

“Our technology is transportable and the formula can be easily reproduced in other provinces in South Africa,” says Wynand Nortje, technical manager, Shisalanga Construction. “We have plans to start the process in other regions in the country once we are satisfied that the process is well received and offers what we promise.

We are working with the roads agencies at

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Roads & Bridges

About Shisalanga Established in 1998, Shisalanga has grown from strength to strength in the road construction industry and now not only manufactures and paves hot mix asphalt, but manufactures highquality cold mix asphalt and provides specialist solutions in lay surface and slurry seals, crack sealing, deep and shallow milling, in situ stabilising and hydrocutting surface treatment.

Shisalanga has become a leader in new innovations, leading the way with products such as steel slag manufactured asphalt, also a first in South Africa. This product is the preferred aggregate used for asphalt manufacture on the busiest highway in South Africa, the National Route 3 (N3).

We are working with the roads agencies at various levels and see this plastic paving technology as being a new dimension in our industry.”

various levels and see this plastic paving technology as being a new dimension in our industry.”

Comment from roads agency authorities is that they are very pleased with the technology and the advancement made in a direction that lends itself to including the use of waste materials.

Industry feedback Kit Ducasse from the KwaZulu-Natal Department of Transport says: “The recycled plastic road trials being conducted are significant – if we can help the environment, it is better for us and future generations. Shisalanga is an innovative company and innovation that works is great. More tests will be conducted over time and once the technology has been proven, then it will be used. What I’ve seen to date is great.”

Shisalanga Construction will continue to trial and roll out this technology and associated projects incorporating this new intellectual property, along with the sound conventional products that have made the company such an incredible household brand in the South African road surfacing industry.

www.shisalanga.com

Roads & Bridges

Sabita listing Title Initials Last Name

Company

Postal Address

City

Mr Mr Mr Mr Ms Mr Ms Mr Mr Mr Ms Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr

F J D JJS AJ R J C N P L JG W AL D W A A P B H B RC WAG R M

Kemp Pelser Agenbag Weidemann Broom Lehman Browne Burns Pienaar Grindley Mthethwa Robertson Nelson Botha Smith van Niekerk Greyling Hill Neal Ballantyne Groenewald Theron King Venter Ntombela Lehoko

Actop Asphalt (Pty) Ltd Actophambili Roads (Pty) Ltd Advanced Polymers (Pty) Ltd AECOM SA (Pty) Ltd AJ Broom Road Products cc Ammann Construction Machinery SA Anton Paar Southern Africa Aqua Transport & Plant Hire (Pty) Ltd Aspasa/Sarma Astec Technologies (Pty) Ltd Astron Energy Aurecon SA (Pty) Ltd BituGuard SA Bitumen Supplies & Services (Pty) Ltd Bitumen World (Pvt) Ltd BSM Laboratories (Pty) Ltd BVi Consulting Eng. Wc (Pty) Ltd Cape Laboratory Equipment Cape Peninsula Univ of Technology CIM Chemicals (Pty) Ltd Colas South Africa (Pty) Ltd Concor Infrastructure Dick King Lab Supplies (Pty) Ltd DMV Harrismith (Pty) Ltd Dow Southern Africa (Pty) Ltd Dubang Roads & Environmental Solutions

PO Box 16661 PO Box 16661 PO Box 742 PO Box 3173 PO Box 16421 Suite 253, Private Bag X43 PO Box 50471 Private Bag X11 PO Box 1983 P O Box 140 5 Century Boulevard PO Box 494 Cambridge Street 32 PO Box 1028 PO Box AY 20 PO Box 15318 PO Box, 86 PO Box 20244 ABC Building, 1st Floor, Symphony Way Postnet Suite 479 P/Bag X29 PO Box 1007 PO Box 585 PO Box 82138 PO Box 912 PO Box 3332 PO Box 782

Atlasville, Boksburg Atlasville, Boksburg Gallo Manor Pretoria Dowerglen Rynfield, Benoni Randjiesfontein Ashwood Ruimsig Rothdene Century City Cape Town Bethlehem Sunninghill Amby, Harare Westmead Century City Big Bay Bellville Gallo Manor Krugersdorp Bedfordview Southdale Harrismith Halfway House Melrose Arch

Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Ms Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr

TW TD G AJ B GM L B C AJ G M N S R J PA GR P AD MC MA N V

McKune La Grange Brown Moffett Cilliers Hattingh Moshoane Henning Bradley Laatz Clunnie Bechan Mzinyane Tinarwo Burger Van Niekerk Olivier Tyndall Pratt Wills Barnard Van Reenen Berning Makabate

Durban University of Technology EFG Engineers (Pty) Ltd Gavin Brown & Associates GIBB (Pty) Ltd GladAfrica Consulting Eng. (Pty) Ltd GMH/Tswelelo Consulting Engineers Green Asphalt (Pty) Ltd GT Designs & Technologies (Pty) Ltd Hatch Africa (Pty) Ltd HHO Africa Imesa Impact Chemicals (Pty) Ltd Industrial Oleochemical Products (Pty) Ltd Instant Tar Surfaces iX engineers (Pty) Ltd Javseal (Pty) Ltd JG Afrika (Pty) Ltd Kantey and Templer (Pty) Ltd Kaymac (Pty) Ltd T/A Kaytech Kraton Polymers Nederland Bv Leo Consulting (Pty) Ltd Letaba Laboratory (Pty) Ltd Liesen Bitumen (Pty) Ltd Mafate Business Enterprises

PO Box 101112 PO Box 3800 24 Botanic Grove PO Box 3965 PO boX 3893 PO Box 2201 Stand 541, Road D1660, Cyferskuil Unit 6 Sugarbush Plce, 10 Sugarbush Cres PO Box 25401 PO Box 6503 PO Box 2190 PO Box 30792 PO Box 12080 PO Box 17219 PO Box 398 PO Box 28041 PO Box 1109 PO Box 3132 PO Box 116 PO Box 201636 PO Box 32798 PO Box 739 Postnet Suite 228, P/Bag X9063 PO Box 380

Pietermaritzburg Durbanville Berea Cape Town Cape Town Randburg Moreleta Dist NW Pinetown Gateway, Durban Roggebaai Westville Kyalami Jacobs, Durban Norkem Park Bellville Malvern Sunninghill Cape Town Pinetown Durban North Totiusdal White River East London Steelpoort

Postal Code 1465 1465 2052 0001 1612 1500 1683 3605 1732 1964 7441 8000 9701 2157 3608 7446 7448 7530 2052 1740 2008 2135 9880 1635 2076 3209 7551 4001 8000 8000 2125 0483 3608 4321 8012 3630 1684 4026 1631 7535 4055 2157 8000 3600 4016 0135 1240 5200 1153

IMIESA October 2019

25

Roads & Bridges

Title Initials Last Name

Company

Postal Address

City

Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mr Mrs

D SRM W B O JR BC DS F M J N D B

Moodley Adande Reusch Burger Peringuey Uys Greyling Judd Samaai Manicum Strydom Nathoo Bennett van der Wat

Masana Petroleum Solutions (Pty) Ltd Mdubane Energy Services (Pty) Ltd Milling Techniks (Pty) Ltd Mmila Civils & Traffic Services (Pty) Ltd More Asphalt (Pty) Ltd Mott MacDonald Africa (Pty) Ltd Much Asphalt (Pty) Ltd N3 Toll Concession (Pty) Ltd Nadeson Consulting Services Naidu Consulting (Pty) Ltd Namibia Technical Services cc Nathoo Mbenyane Engineers National Asphalt (Pty) Ltd Nelson Mandela University

PO Box 1085 214 9th Avenue PO Box 779 PO Box 40158 PO Box 2180 PO Box 7786 PO Box 49 PO Box 67166 PO Box 51121 PO Box 2796 PO Box 30623, Pioneers Park PO Box 47595 PO Box 247 Dept Civil Eng. Block C, Room C210

Mr Mr Mr Mr Mr Mr Mr Ms Mr Mr Mr Mr Mr Mr

L T N W P J L S J G T D G T

Heathcote Freestone Burger Venter Chirnside Nicholson Cochrane Rattray Louw Catin Saks Weldrick Joffe Thothela

PO Box 3186 PO Box 288 PO Box 129 3 Van Eyck Crescent 15 Alice Lane, 3rd Floor 1550 Tiburon Boulevard, Suite B1 Cnr Jurgens Street & Jet Park Road PO Box 50566 PO Box 3722 PO Box 10302 PO Box 911-489 Bldg 4, Quodrum Office Park PO Box 84513 Whitby Manor Office Prk, 14th Rd

Mr Mr Mr Mr Mr Mr Mr Mr Ms Mr

PB JB BI A S RL WRJ C K E

Outeniqua Lab (Pty) Ltd Polokwane Surfacing (Pty) Ltd Power Construction (Pty) Ltd Pride Lab Equipment (Pty) Ltd Puma Energy SA (Pty) Ltd Raetex Industries Rand Roads (a div of Grinaker-Lta) Ltd Rankin Engineering Consultants Raubex (Pty) Ltd Raubex KZN (Pty) Ltd Reliance Laboratory Equipment (Pty) Ltd Rettenmaier South Africa (Pty) Ltd Road Material Stabilisers (Pty) Ltd Royal Mndawe Holdings (T/A ROMH Consulting) Royal HaskoningDHV (Pty) Ltd Salphalt (Pty) Ltd SARF Sasol Chemicals (a div of Sasol SA Ltd) Sasol Energy (a div of Sasol SA Ltd) Shell Downstream SA (Pty) Ltd Shisalanga Construction (Pty) Ltd SMEC South Africa (Pty) Ltd Specialised Road Technolgies (Pty) Ltd Spraypave (Pty) Ltd

Saxonwold Morningside, Durban Gillits Faerie Glen Durbanville Roggebaai Eersterivier Highveld Park V & A Waterfront Westway Office Park Windhoek Greyville Bon Accord Summerstrand Campus George Industria Ladanna Blackheath De La Haye Bellville Sandton Tiburon, Ca Jet Park, Boksburg Lusaka, Zambia Bloemfontein Ashwood Rosslyn Johannesburg Greenside Noordwyk, Midrand

PO Box 867 PO Box 234 PO Box 8379 Sasol Place 6th Floor 50 Katherine Str PO Box 5486 27 Canterbury Village, 3 Blessing Ninela PO Box 1657 PO Box 72927 PO Box 15324 PO Box 674

Gallo Manor Isando Birchleigh Sandton Johannesburg Hillcrest Hillcrest Lynnwood Ridge Westmead, Pinetown Alberton

2146 1600 1621 2000 2000 3610 3650 0040 3608 0009

Tau Pele Construction (Pty) Ltd Tekfalt Binders (Pty) Ltd Tosas (Pty) Ltd Total SA (Pty) Ltd Tpa Consulting (Pty) Ltd Tshepega Engineering (Pty) Ltd Tzaneen Asphalt & Paving Manufacturers University of Pretora, Dept Civil Eng University of Stellenbosch Worldwide Tanks On Hire cc WSP Group Africa (Pty) Ltd Zebra Surfacing (Pty) Ltd Zimile Consulting Engineers (Pty) Ltd Zydex Industries Pvt Ltd

PO Box 13125 PO Box 531 PO Box 14159 3 Biermann Ave PO Box 1575 PO Box 33783 Site 800 Nkowankowa Industrial Lynnwood Road, Private Bag X1 PO Box 2250 PO Box 98867 PO Box 14335 Postnet Suite 252, P/Bag X11 G1 Gotri Sevsai Rd, Sevasi Vadudara

Noordstad Bergvlei Wadeville Rosebank Westville Glenstantia Nkowankowa Hatfield Matieland Durban Sloane Park Kenwyn Halfway House Gujarat

9302 2021 1422 2132 3630 0010 0870 0002 7602 4000 2152 7790 1685 39021

Mr Mr Mr Mr Mr Prof Mr Prof Prof Ms Mr Mr Mr Mr

26

Joubert Lansdell Jonsson Marais Shabalala Hornsey Nortje Botha Makamu Jansen van Vuuren MP Prinsloo L Qhobela D Pagel V Nel RB Purchase GJ Jordaan V Mabunda WJVDM Steyn KJ Jenkins R Ganga M Muthen JM Pearce S Gama P Sreedhar

IMIESA October 2019

Postal Code 2132 4001 3603 0043 7550 8012 7103 0169 8002 3635 4023 0009 6001 6536 0704 7581 7530 2196 94920 1459 9300 3605 0200 2034 1687

Roads & Bridges

Bakwena Platinum Corridor Concessionaire is a caring and responsible road authority that finances, builds, operates and maintains sustainable and safe road infrastructure.

B

akwena manages a 385 km N1-N4 network that serves a steadily rising volume of traffic.

Monitoring vehicle patterns and ensuring that the optimal accident prevention measures are in place are top priorities.

A recent example is Bakwena’s decision to install median concrete barriers on the N4 at Helen Joseph interchange in Rustenburg.

Solomon Kganyago, commercial manager, Bakwena, says the toll concessionaire had noted a significant increase in the number of crashes over this section due to motorists making illegal U-turns. An urgent intervention was required.

Together with the relevant authorities, Bakwena researched the best solution. A key consideration was that the traffic measures chosen would not create an additional hazard.

Investigations showed that concrete barriers were the fastest and most effective option.

To create space for the concrete medians, the existing shoulders were reduced from 2.5 m to 1.5 m. The installation was carried out by Basella Maintenance and took approximately three weeks. During this time, stop/go controls in both directions were in place to ensure the safety of motorists.

As an additional measure to protect vehicles, TAU Tube crash cushions have been installed at the end points of the concrete barriers.

Supplied by Lindsay Africa, the TAU Tube system is designed to meet EN1317-3 50 km/h, 80 km/h, 100 km/h and 110 km/h test criteria in a 6 m footprint.

Concrete median barriers being positioned on the N4

Engineering world- class routes No more U-turns: Bakwena is committed to ensuring that its network meets the best local and international safety standards

Previous enhancements to the Helen Joseph interchange have included: • widening of the embankments at the northern and southern terminals to allow for the provision of two through lanes northbound and southbound on Helen Joseph Road itself • the provision of a dedicated right-turn lane at the northern terminal • the provision of a dedicated left-turn slip lane at the southern terminal • the provision of traffic signals at the northern and southern terminal • enforcement by traffic authorities to prosecute vehicles that ignored the road signage and markings prohibiting U-turns.

“We approach safety in two key ways: first, through engineering design and construction, and second, via safety awareness and simulated emergency incident training, working with local traffic authorities,” says Kganyago.

“It’s a continuous process as we find new ways to improve driver behaviour,” he concludes.

Solomon Kganyago, commercial manager, Bakwena

A TAU Tube crash cushion: these products are designed to shield concrete barriers, bridge piers and steel barriers

www.bakwena.co.za

IMIESA October 2019

27

Roads & Bridges

Setting the PG standard Durability, riding performance and safety are key factors motivating the adoption of industryrecognised performance grade (PG) specifications for bitumen in South Africa.

T

he modern era of higher traffic volumes and loads demands an improvement in the durability of paved roads. Current empirical binder testing provides limited information on future pavement per formance and, moreover, empirical tests cannot effectively characterise modified binders, which are being increasingly used throughout the world. This has resulted in a move internationally to establish specifications based on fundamental engineering properties capable of better

guidance in considering the performance requirements of asphalt mixes.

This evolution has not escaped South Africa: it started tackling a possible new specification way back in 2003, with the intent that PG should: • include measures describing stress/strain relationships under field loading • consider the pavement conditions: temperature, traffic speed, traffic volume and pavement structure • include acceptance limits derived from experience and actual field performance.

This initiative was given further impetus with the development of the South African Road Design System and the new Asphalt Mix Design Manual (Sabita Manual 35/TRH8), both calling for performance-tested characteristics.

Basis of the specification Asphalt layers and spray seals in service are required to resist the following forms of distress: • distortion – permanent deformation • fracture due to:

Table 1 SA technical specification and report values

PERFORMANCE GRADE Test property

58S -22

58H -22

Maximum pavement design temperature, Tmax (˚C) Minimum grading temperature, Tmin (˚C)

58E -22

64S -16

64H -16

64V -16

64E -16

70S -10

70H -10

64 70 -16 -10 ORIGINAL BINDER Compulsory report only during implementation phase Compulsory report only ≤ 0.9

Storage stability at 80°C (% diff, G*T and G*B) at Tmax 1

≤ 15

Flash Point (˚C) G* and δ at TIT , Pa, degrees Mass Change (m/m), (%) ≤ 4.5

≥ 230 AFTER RTFO AGEING Compulsory report only during implementation phase ≤ 1.0 ≤ ≤ ≤ ≤ ≤ ≤ 1.0 ≤ 0.5 ≤ 4.5 ≤ 2.0 ≤ 0.5 2.0 1.0 4.5 2.0 1.0

Ageing Ratio, G*RTFOT/G*Original G* and δ at TIT, Pa, degrees Creep stiffness, S (60s) at Tmin + 10oC, MPa, m (60s) at Tmin + 10oC, minimum, MPa/s ΔTc =Tc S – Tc, m, (0C) Ageing Ratio, G*PAV/G*Original Note: 1 While the binder is sampled at 80°C, G* is determined at Tmax

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IMIESA October 2019

70V 70E -10 -10

58 -22

G* and δ at TIT, Pa, degrees G*/sinδ, at 10 rad/sec and Tmax , (kPa) Viscosity @ 165°C, ≥30 s-1 , (Pa.s)

JNR @ Tmax, (kPa-1)

58V -22

AFTER RTFO AND PAV AGEING Compulsory report only during implementation phase ≤ 300 ≥ 0.300 ≥–5 ≤ 6.0

≤ 0.5

Roads & Bridges

– fatigue or loss of durability – temperature fluctuations.

In addition, they should be durable – i.e. maintain their properties to counter distress for a long period. As a result, the concept of damage-resistance characteristics developed in 2010 in the USA was introduced to provide a specification framework to gauge the binder’s resistance to damage resulting from: • permanent deformation (viscous flow) – at elevated temperatures and slow rates of loading • cracking – at intermediate temperatures • temperature fracture – at low temperatures.

The specification framework should facilitate the rational selection of binders on the basis of: • traffic volumes and speed

• climate (max and min temperatures) • binder durability.

Further to the above performance-related properties, additional requirements have been set in the interests of safety, storage stability and viscosity limits to facilitate handling and application at elevated temperatures.

This draft specification has now been published as a SABS Technical Specification, SATS 3208. While SANS 4001-BT1 will for now still be the applicable standard of compliance for those that carry the SABS mark, SATS 3208 allows for the market to specify performance-related specifications in South Africa. Sanral and certain other roads authorities will now call for compliance to SATS 3208 in tender documents.

Detailed laboratory testing protocols have been developed for these tests and will be published as Sabita Manual 39.

Roads & Bridges

Colas recently completed the first Valorcol trial at its bitumen storage facility in Durban using 100% recycled asphalt

A green and versatile base course layer Colas South Africa introduces Valorcol, a Colas speciality solution that provides an environmentally friendly and economic way to upgrade gravel roads, re-profile existing roads or build stabilised base layers.

V

alorcol is a cold-mix technology made with anywhere from 1% to 100% reclaimed asphalt, the balance comprising new aggregate or, alternatively, the in situ material.

Aggregates are carefully selected and subject to a detailed mix design process performed in Colas’ state-of-the-art laboratories.

A mixture of aggregate and bitumen emulsion is processed in a fit-for-purpose, mobile cold recycling mixing plant, which can be established anywhere in the country in close proximity to the customer’s site. Since the process is cold, this results in a safer work environment, easy application and significant reduction in energy usage. The product is also workable for longer periods when compared to hot-mix alternatives.

Application process Valorcol is applied using only a grader or asphalt paver and compacted using pneumatic and steel drum compactors. Depending on the design, Valorcol is placed in a layer from anywhere between 3 cm to 30 cm. The pavement can be opened to traffic as soon as compaction is completed. A seal coat can be applied to create a waterproof seal and set any loose course material.

ABOVE RIGHT Valorcol is applied using only a grader or asphalt paver and compacted using pneumatic and steel drum compactors

solving social issues such as dust pollution and mobility challenges. The product is also ideal for labour-intensive construction techniques.

This innovative product has been successfully used by Colas around the world on a variety of projects, from wearing course applications in the southern French Alps to sub-base replacement in a new build on Reunion Island.

Main uses - Maintenance: levelling, re-profiling - Pavement reinforcement - Base for new pavements - Upgrading of gravel roads - Logistic facilities and storage yards

Durban

Advantages - Uses recycled asphalt pavement - Savings on materials, binder and transportation - Conserves natural aggregate resources - Cold-mix technique with significant energy savings - Lower emissions and fumes - Storable and workable for longer periods - Characteristics adapted to requirements, depending on the selected application - Improvement of roadway profile - Adhesion of courses - Uniformity of structure - Can be laid down either by a paver or by a grader

Locally, Colas recently completed the first Valorcol trial at its bitumen storage facility in Durban using 70% recycled asphalt.

The existing gravel surface was uneven and corrugated, with severe drainage problems occurring during wet weather. The application of Valorcol has created a stable, smooth surface with a significant improvement in wet weather performance.

The possibilities are endless, as Valorcol offers superior performance in light to medium traffic applications, making it possible for any small contractor to deliver a quality product that meets both the client and end user’s expectations.

Valorcol has demonstrated superior performance on rural gravel road upgrades,

IMIESA October 2019

31

Runways

Rehabilitating a critical airstrip Rebuilding and extending the Rubkona gravel runway in South Sudan paved the way for larger-bodied fixed-wing transport aircraft servicing a humanitarian aid station and refugee camp for internally displaced people. Faced with a range of options, WSP Group Africa devised a value engineering approach that cut costs significantly and provided a lasting solution. By Alastair Currie

H

igh aircraft traffic volumes had progressively taken their toll on Rubkona’s airstrip, which had become heavily corrugated, with ensuing gravel loss. This was progressively exacerbated by the geology and the wet and dry extremes experienced in the region. During the rainy season, typically extending from May to October, air traffic for fixed-wing aircraft was restricted to intermittent dry runway days.

Up to 48 hours were required for the airstrip to dry out sufficiently for the safe landing of fixed-wing aircraft. During the summer months, the underlying black cotton soils also meant that severe and deeper-level surface cracking occurred – large enough to insert a closed hand – making the runway unsafe for planes.

Characterised as expansive clays, black cotton soils have a high potential for shrinkage

Each geocell panel measure 2.5 m x 10 m.

Using on-site labour, these are stretched out and stitched together

32

IMIESA October 2019

or swelling, subject to moisture variables. On this site, these soils reach a depth of up to 15 m deep, with a silty-sand layer below.

Road transport would have been an alternative option, but the general state of infrastructure is poor to the point where the route becomes non-negotiable in wet periods, hence the reliance on aviation. So when planes couldn’t land, this meant that inbound logistics for the aid mission had to be supplied by military-scale helicopters. However, given the much higher fuel burn rate of rotary aircraft, this added a greater payload cost.

Need for larger planes The client brief to WSP was to come up with a design solution that would restore and then extend the runway to accommodate larger transport planes, like Lockheed Martin’s C-130 Hercules and its civilian variant, the

L-100-30 Hercules – all year round. These aircraft are equipped to carry a cargo of approximately 19 tonnes. Prior to the upgrade, the Antonov An-26, with its approximately 5.5 tonne payload, was the largest plane that the airstrip could handle.

“During construction, a key requirement was for the airstrip to remain open to traffic,” explains Hercu du Preez, principle associate: Pavements – Transport and Infrastructure, WSP Group Africa, who led the project.

“For this reason, the works were split into two phases. The first phase entailed the rebuilding of the existing 800 m airstrip, followed in Phase 2 by extension works to establish the final 2.2 km runway,” he continues.

Sourcing the layer works materials was an immediate challenge that subsequently had a major influence on the approved design. This resulted in WSP specifying the application

Runways

With routine maintenance, WSP’s design will ensue that the Rubkona airstrip will remain functional and serviceable over its 10-year design life.” of polymeric nanocomposite alloy geocells as the preferred mechanically stabilised and accepted construction methodology.

Compared to alternative HDPE options, polymeric nanocomposite alloy geocells have exceptionally high creep resistance, which is an essential feature for runway construction.

Permanent deformation of the geocells occurs due to constant loading. Equivalent HDPE systems are not designed to achieve this result and are, therefore, unsuitable for this application.

“Geocells have a 3D honeycomb shape and each cell is filled with material to form its final integrity. At Rubkona, this comprised white silty sand sourced from a local borrow pit,” says Du Preez, adding that by confining the material, the modulus of elasticity is improved significantly, depending on the nature of the supporting layer. In this case, that was another geocell layer.

“To accommodate larger planes, you need maximum stiffness in the upper pavement layers and this was optimally achieved with the geocells,” he continues. “Thanks to the design, we were also able to keep the pavement as light as possible, to reduce the risk of any potential settlement.”

The final design After detailed assessments, the approved layer works design comprised the following: • a 150 mm gravel wearing course composed of G6-G7 ferricrete material, referred to locally as Murram • a 150 mm white sand layer mechanically stabilised with a 100 mm geocell grid • a further underlying geocell grid layer to the same specification

The sand stockpiles are back-tipped on-site and then the successive windrows are bladed into the cells using a grader

• a 40 kN geotextile separation layer above the underlying black cotton soil.

The original construction cost using a conventional chemical stablisation methodology was estimated at around $US27 million (R393 million), making it a non-starter. The accepted WSP design came in around approximately $10 million (R145.5 million), which then received the green light.

Thanks to the black cotton soils, the conventional design would have required around 600 mm of Murram to form the wearing course. But the source of the nearest Murram commercial aggregate was situated some 160 km away. Aside from the sheer distance and the constant risk posed by civil unrest, the roads leading to the site were in too poor a condition to enable on-time project delivery. Therefore, importing this wearing course was cost-prohibitive.

A calculation also showed that by going the chemical stabilisation route, at least 1 000 truck-loads of cement or lime would have been needed for the project. So going the geocell

route made things much simpler: packed in containers, they were all flown in by Antonov An-26 aircraft. An alternative G6-G7 material was also sourced closer by, for the gravel wearing course.

Construction began in November 2017 and was completed in May 2018, which is a remarkably short time frame for a project of this nature.

“Thanks to a geocell solution, fixed-wing aircraft approaching Rubkona airstrip can now land every day of the year, given permissible flying conditions,” Du Preez concludes.

Applying the final 150 mm gravel wearing course

Geocell establishment at an advanced stage of construction

A transport aircraft parked on the new runway apron

IMIESA October 2019

33

Partners in Infrastructure

Embracing change and innovation JG Afrika has embarked on a drive to position the company at the forefront of developments under way in the built environment.

T

he global engineering sector is facing major disruption, driven by, among other innovations, 3D printing, drones, alternative energy sources, sustainable materials, as well as artificial intelligence and machine learning – all areas being incorporated

by JG Afrika within its future capabilities and services.

Paul Olivier, managing director, JG Afrika, says that this drive to revolutionise the way in which the company innovates will ensure that it remains among the vanguard of the industry.

“Constant innovation has ensured that we’ve remained relevant throughout our proud 97-year history. We, therefore, have a sound basis upon which we are able to continue to build. In today’s fast-paced engineering environment, we now have a wonderful broad platform from which to fully capitalise on new ideas and developments to create new

34

IMIESA October 2019

opportunities and innovative solutions for our clients,” Olivier tells IMIESA. Led by Chris Wise, technical director at JG Afrika, a team of ‘Innovation Facilitators’ has been established to collate new ideas from staff.

“Our approach has already started paying dividends, having generated many ideas over the past few months since the initiative was launched. Moreover, we have seen that our people – JG Afrika’s strategic assets – are starting to think differently about their projects and the way they approach them,” Wise says.

This initiative is complemented by the significant cross-pollination that continues to take place between JG Afrika’s more than 20 different disciplines and among the firm’s professionals working on the company’s many projects.

Ideas range from ‘low-hanging fruits’ that can be implemented swiftly and with minimal

Paul Olivier, managing director, JG Afrika

effort through to more ambitious programmes and projects with a significantly larger impact that will be realised over the medium to long term. Olivier says that the biggest challenge is identifying those ideas that should be implemented first.

Circular economy Potential ‘quick win’ examples are innovative integrated waste management solutions to assist industries in deriving sustainable value from their residue streams, in order to achieve a more circular economy.

“We have some really creative people in the waste industry. They have helped implement the first fully integrated waste facilities in Cape Town and Durban, and have identified more opportunities to explore in terms of recycling, managing waste and energy generation, which have been implemented at these and other facilities,” Olivier says.

Notably, JG Afrika recently received a commendation at the 2019 CESA AON Engineering Excellence Awards for its work on the new portable flush toilet cleaning facility at the Borcherds Quarry wastewater treatment works site in Cape Town.

JG Afrika and Project Assignments (SA) were appointed by the City of Cape Town to design and develop this facility, which efficiently and safely disposes of the sewage collected from informal settlements. Mechanised and automated, it is believed to be the first of its kind in the world and several patent applications are pending.

Partners in Infrastructure

Constant innovation has ensured that we’ve remained relevant throughout our proud 97-year history.”

Olivier says that there is also potential for JG Afrika to grow its presence in the decentralised energy market.

“It is a growing global trend that is challenging traditional centralised generation models. South African companies are also increasingly looking at ways of generating energy from alternative sources, considering concerns around the reliability and skyrocketing costs of grid electricity. Although the costs of alternatives, such as wind and solar, are still comparatively high, they are steadily declining. In many instances, they can also be combined with a grid-tie system to produce a level of electricity saving and reliability,” he explains.

Water conservation Meanwhile, JG Afrika has also played a leading role in assisting companies, municipalities,

schools and universities to build resilience to water restrictions.

Work undertaken for the International School of Cape Town still stands out as a sound example of JG Afrika’s stellar work in the field. When all three phases of the project are implemented, the school will be able to achieve savings in water of between 95% and 98%.

The company also designed and is implementing innovative means of reusing

campus grey water in fit-for-purpose applications at Stellenbosch University. It was the winner in the Division Award – Water category in the SAICE Western Cape Regional Awards programme.

One of the largest installations of its kind in Africa, the system will significantly improve campus water supply resilience once all phases have been completed. The network will flush more than 1 300 toilets that are used by about 25 000 university students to meet between 20% and 30% of campus water supply and supplement campus irrigation.

Olivier says that JG Afrika’s innovation drive supports the company’s focus on being the best at what it does and to grow and retain a broad range of disciplines, as opposed to being the biggest in the industry.

“It will enable us to differentiate ourselves in the market and position the company in such a way that it can negotiate change easily. This is in addition to growing a new generation of thought leaders in the field and potentially opening up new operating niches or lines of service to the market,” he concludes.

2

9879_JG a5 Ad20190805_2UW.indd 2

2019/08/22 12:14

Joint Conference with

IMESA & IAWEES Institute of Municipal Engineering of Southern Africa & International Association of Water, Environment, Energy and Society

EVENT: VENUE: DATES: THEME:

84TH IMESA Conference in collaboration with IAWEES Cape Town International Convention Centre 28-30 October 2020 Synergy through Engineering

Earn 2.5 CPD points by attending

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t: +27 (031)266 3263 e: conference@imesa.org.za marketing@imesa.org.za www.imesa.org.za

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Partners in Infrastructure

Economic lull harming transformation The inertia of South Africa’s economy is having a significant negative impact on the transformation of companies, says Nonkululeko Sindane, CEO of civil engineering project management and consulting firm Mariswe.

M

ariswe, formerly UWP Consulting, rebranded in early 2019 following sweeping changes within the firm, which included the acquisition of three black-owned consultancies coupled with a strong and successful internal transformation journey.

Today, Mariswe is 100% employee owned and 55% black owned. Black women effectively own 24% of the company. Mariswe also successfully retained its Level 1 BBBEE Contributor status in its first audit under the Amended Construction Sector Codes of Good Practice in November 2018.

Mariswe CEO Nonkululeko Sindane warns that sustainable construction sector transformation depends on economic growth

“We place strong emphasis on growing our shareholding by black employees and specifically black woman employees, recognising that we started from a low base,” Sindane explains.

“But our progress is at risk in the current environment, where projects are few and far between. Our employees use their dividends to

Partners in Infrastructure pay for their shares and this is not possible without growth,” she explains.

job training are also diminished. While this is disappointing, we are focusing on protecting the gains we’ve made,” says Sindane.

Skills development at risk “Transformation is a priority for our government, so everything necessary must be done to improve the performance of the South African economy and particularly the construction industry,” she continues. “This sector fuels industries such as steel, materials and other manufacturers, banks as financiers of large projects, and many more – all strong creators of employment.”

Mariswe’s sustainability is founded on the training and development of young employees into well-rounded professionals with management and technical skills. The firm has been forced to cut back on its development programmes due to the slow economy.

“We are faced with many young people finishing their studies with hopes of candidacy training, internships and learnerships. Yet companies can no longer afford to give many of these young people opportunities for development, which also harms the industry.

Without new projects, opportunities for on-the-

38

IMIESA October 2019

Preparing for the future The firm is accredited by the National Credit Regulator to offer loans to employees to pay for their shares, with special focus on younger employees, to drive loyalty, ownership, sustainability of the company and individual financial growth of the shareholders.

A strategy to grow black woman leaders in both technical and administrative roles has included the revision of internal strategies to attract and engage women in the business. This includes improvements to policies that affect women and participation in Mariswe’s three-year Leadership Development Programme.

Management attitudes are key to building a transformation ethos, Sindane believes.

The Mariswe difference lies in understanding the challenges raised by management and finding ways of working around them. “If transformation is applied well, it should not be seen in isolation, but as an integral part of the company strategy for business growth and sustainability,” she points out.

Mariswe has grown its supplier base using preferential procurement guidelines, with a focus not only on procuring from black service providers, but also on quality and sustainability of the services procured to optimise the business.

“We are very happy with our service providers because they add real value to the products we deliver to our clients,” she adds.

“The civil engineering sector needs growth to transform and to attract young people to join the industry. It is simply not possible to keep the momentum we wish for in the current climate,” Sindane concludes.

Partners in Infrastructure An Ammann CounterFlow asphalt plant manufactured in India

Ammann’s strategic focus on SMMEs Ahead of the curve, Ammann leads the way through innovation and expert support for large and small businesses globally. Within Southern Africa, Ammann’s value-added solutions are helping to build SMME capacity and industry transformation in the roads and general construction sector.

O

n the ground in more than 100 countries worldwide, Ammann has an in-depth understanding of developed and emerging market requirements. That’s not surprising when you consider that the Group celebrated its 150th anniversary in 2019.

Early milestones that helped to shape the business include the acquisition of the Swiss patent for tar macadam machines in 1908, and the introduction of the first motorised Ammann road rollers in 1911. That formed the base for a multifaceted range of products that keeps on evolving.

Rocco Lehman, managing director, Ammann South Africa, explains, “Our business is founded on creating the best customer experience, either via our dealers or through a direct OEM interface.”

Locally, ELB Equipment is Ammann’s Southern African dealer for its machine line-up. A wholly owned South African company with a 100-year history, ELB has 20 outlets in Southern Africa.

In turn, Ammann South Africa directly sells and supports the OEM’s asphalt and cement plant series.

Business advice, training and support “Ammann doesn’t sell machines in isolation. We take a holistic approach,” Lehman continues.

“The end goal is to guide and train contractors at all levels on the best machine and plant setup to run a profitable business, whether as a road paving contractor, an asphalt supplier, or a combination of the two.”

Most construction companies across the globe start out as SMMEs and, based on expertise and reputation, progressively become leaders within their own country, and with further vision to expand internationally. While Ammann is now a major multinational, it also began life as a small, family-run business. Today, it’s managed by the fifth generation, but with the same unwavering customer-centric approach.

Lowering barriers At present, Ammann is one of the few OEMs able to provide a complete asphalt solution catering for all market requirements. Units range from highly sophisticated plants to more simplified ‘entry-level’, environmentally compliant units that meet all Sanral and allied roads agency specifications.

“High capital equipment costs and a lack of access to finance are the two main barriers to launching an SMME construction business,” says Lehman. “We make provision for this through market-specific product development, as well as provision for internal and external equipment finance.”

A good example of an SMME spec is the costcompetitive CounterFlow asphalt plant range manufactured by Ammann’s state-of-the-art production facility in India. Capacities range from 80 tph to 120 tph and meet recycled asphalt specifications.

“It’s a proven fact that SMMEs are essential – and the backbone – for any economy, whether it’s in Germany, India or South Africa. That’s why

Rocco Lehman, managing director, Ammann South Africa

Ammann has been supporting client business growth from inception through purpose-built mechanisation,” Lehman explains.

“We’re proud to state that, in the past eight years or so, we’ve worked alongside five or six new entrants into the South African and crossborder asphalt market, all of which are now operating sustainable businesses with Ammann products,” states Lehman. “Given the expected upturn in the local roads market, the potential for further strategic partnerships is much greater.”

Alongside this, ELB has supported around 10 South African SMMEs to grow their Ammann compaction and paving fleets.

In terms of equipment finance, Ammann is investigating the rent-to-own model for its asphalt plant series, with maintenance managed by the OEM. For the machine range, ELB already works with leading financial institutions that offer lease, rental, and hire purchase agreements in line with standard industry practice. In addition to this, ELB makes provision for trade-ins.

“Our next step in the value chain is to work with roads departments and allied private and public sector infrastructure stakeholders to investigate how we can help nurture South Africa’s current and future SMME contractors,” Lehman concludes.

www.ammann.com

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Partners in Infrastructure

ELB is Ammann’s best compaction dealer

T

he Ammann Top Dealer Award 2018 for Compaction Equipment recognises the Swiss OEM’s topperforming dealers and it’s a highly prized achievement.

Since taking on the agency for Ammann compaction equipment in 2014, ELB Equipment has led the brand, making massive inroads into the local compaction and road paving equipment market. In the compaction segment, Ammann is now firmly ranked in the top three locally thanks to ELB’s dedicated focus on sales and after-sales support.

Right stuff “This is a considerable achievement considering the quality and status of our opposition,” says Desmond van Heerden, divisional director,

compactors, as well as walk-behind, tandem, pneumatic tyre rollers, and soil compactors.

Contractor friendly

The Ammann brand continues to gain traction across the industry spectrum.

A comprehensive line-up of models Desmond van Heerden, ELB Equipment. “We ensures that there’s a purposedivisional director, ELB Equipment, proudly attribute our success designed machine for small- and largedisplays its Ammann Dealer to a combination of our scale projects. From international of the Year 2018 Award for excellent reputation in airport runways to national roads, compaction equipment the industry, as well parking lots and pathways, Ammann as the quality of Ammann products, our large has a solution. Within the emerging contractor support footprint and reputation for quality of market, Ammann’s walk-behind rollers and service and supply. allied compact equipment models are the ideal “With the correct ingredients, we have taken entry point. the market by storm with the right product, at ELB recently announced all-new extended an affordable price and with backup to ensure a warranties: a 36-month or 3 000-hour warranty long and productive lifespan of the equipment. is provided for all Ammann walk-behinds, As a result, it has become the product of choice rammers and plate compactors, while a twofor contractors in South Africa and a preferred year, or 2 000-hour, warranty comes standard brand when it comes to compaction and road for Ammann large compaction machines. construction,” he continues.

“This is sure to boost the range and ELB offers a full range of compaction further extend Ammann’s popularity in the equipment, including rammers and plate marketplace,” Van Heerden concludes.

A Bailey bridge supported on a gabion foundation

Environmental Engineering

Going green with gabions

Alongside conventional roles, like river erosion channels and mass gravity retaining walls, gabion and gabion mattress designs can be adapted to suit a wide range of applications that include foundation support and bioengineering.

By Alastair Currie

W

ithin the civil engineering arena, the tremendous structural strength of gabions makes them an ideal choice for bridge abutments tying into retaining wall systems. These can range from national highway-type structures to more simplified works.

A classic example in terms of the latter is the Bailey bridge originally developed for military applications during the Second World War, but still extensively in use worldwide for forming crossings that can be either temporary or permanent. They are particularly well suited for establishing quick and lasting bridge connections over rivers and gullies.

Typically constructed using modular structural steel sections, Bailey bridge components are relatively easy to transport to remote areas.

Once the construction phase begins, though, the starting point is to found and establish the abutments.

Reinforced concrete is an option, but will prove challenging from a logistics perspective in more off-the-track settings. Gabions, on the other hand, are an ideal choice. In most cases, naturally occurring rock materials can be sourced on-site to form the gabion mattress foundation and integrated retaining wall structures supporting either end of the bridge. In river crossing applications, gabion walls and gabion mattresses also provide scour protection, which is especially important during flood conditions.

Since no specialist equipment is required, these projects are ideally suited to labourintensive construction methods, which is a key consideration in addressing poverty alleviation and unemployment within rural communities.

“When properly constructed, gabion walls exhibit high compressive strengths, typically of around 300 t/m2, and so are well suited to carrying a wide range of vehicular traffic,” explains Louis Cheyne, managing director

A typical embankment protection design using a biodegradable blanket

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of Gabion Baskets, a leading manufacturer and specialist in environmentally engineered solutions.

To date, Gabion Baskets has supplied a number of gabion orders for Bailey projects.

These include installations completed by Bridges for Africa, a local company that specialises in this area.

Bioengineering Aesthetics has become a key design mandate for all built environment structures, whether they be buildings, bridges or walls. These structures increasingly incorporate vegetation, either as a landscaping element or as an integrated green façade feature to enable them to blend in with the environment.

In this respect, gabion walls and gabion mattresses naturally lend themselves to being bioengineered, or greened, and there are diverse techniques that can be used to achieve this.

A close-up view of a jute blanket

Environmental Engineering River mattress with seeded soil pockets

Seeded soil pockets made by geotextile filled with soil

Geotextile Biodegradable soil blanket

There are essentially two key techniques for grow through the gabions to completely cover establishing vegetation on a gabion retaining these structures. wall. The most common approach is to have “The harsh rock effect of a gabion retaining two thirds of each basket filled with rock. A wall can create a deliberate design impact, geotextile layer is then added and the balance especially when complemented by our special of each basket (the remaining third) is filled PVC colour coating range. However, we are with a mixture of rock together with washed- or increasingly receiving requests from developers brushed-in topsoil, held in place by a geotextile. and municipal clients to recommend how these Each step is then also covered with topsoil and seeded. The minimum recommended thickness is around 200 mm.

The second option, Topsoil over step particularly for gabion Geotextile A4 (U24) walls, is to create pockets Front section in the top of the stepped1 rock back gabion system.

(230 mm) wide filled These are lined with a Rock with topsoil with rock washed/broomed filter fabric and filled with in afterwards a mixture of rock and soil, 1 /4 full brace followed by planting with Normal water-wise plants. rock fill Geotextile A2 (U14) Since gabion frames are composed of doublehexagonal twistedwire mesh, there are endless opportunities to vegetate them. This Typical section of a vegetated includes using creepers gabion wall or shrubs designed to

can blend in more, or even be completely greened,” Cheyne expands.

Sometimes, a softer engineering approach can be adopted that provides environmental and structural benefits. This is especially the case on newly constructed slopes and mechanically stabilised earth embankments.

“It’s important to choose the right approach for the fill face,” says Cheyne. “Without an intervention, severe surface erosion can occur.

In this respect, biodegradable soil blankets are highly effective in establishing long-lasting stability. They are usually founded at the base of the embankment with coir logs or sausage gabions for controlled drainage.”

Typically made of jute, a vegetable fibre, these blankets are designed to degrade over a year or two. During this time, these blankets help to keep the soil cool and moist, allowing plant root systems to form and take hold to create a naturally occurring revetment.

“Contractors can hydro-seed the slope before applying the blanket,” Cheyne explains.

“Alternatively, small cuts can be made at preset intervals to enable the planting of shrubs that will then grow through. Research has shown that well-established root systems are very strong and effective.”

In addition to embankments, sausage gabions, which measure around 650 mm in diameter, can also be used in small river channels or for donga rehabilitation. Filled with rock, or a combination of rock and soil, they also lend themselves to the establishment of vegetation growth.

“Being permeable structures, gabions and gabion mattresses are potentially among the greenest environmentally engineered options available. Advances in specialised flat-welded mesh gabions are also proving popular for architectural cladding and walls.

Design elements here can include the planting of shrubs to enhance the final result,” Cheyne concludes.

Hydropower

A view of the entire scheme

Hydropower in Africa Constructed exclusively using local Congolese contractors, the Azambi Hydropower Project is a classic example of a fit-for-purpose approach. This was particularly the case given the fact that the appointed civil contractors had no previous experience on a dam or hydropower development.

The powerhouse viewed from the upstream right bank

T

he 11 MW Azambi hydropower plant (HPP) is located in a remote area of the Orientale province in the Democratic Republic of the Congo. It was commissioned as the third hydropower plant for the Kibali Gold Mine, a subsidiary of Barrick Gold Corporation, to meet its growing power demands. The construction implementation stage extended over an 18-month period and the hydropower station was commissioned successfully in August/September 2018.

As the appointed consulting engineer, Knight Piésold worked closely with Kibali Gold Mine to develop a purpose-built, low-impact and cost-effective installation that now produces approximately 64 GWh of renewable, reliable electricity annually, and increases the mine’s combined installed hydropower capacity to approximately 43 MW. Of this, the mine supplies 1.5 MW free of charge to local communities via its grid connection, helping to power homes and businesses

The intake area and RMC diversion weir

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Hydropower and reduce their reliance on timber to meet energy requirements.

Kibali now has three run-of-river hydroelectric plants in operation that provide the majority of its energy requirements. In the process, it has drastically reduced its reliance on diesel power, reducing energy costs from about US$400/MWh (R5 850/MWh) to close to $100/MWh (R1 460/MWh).

Historically, Randgold Resources (RRL), which recently merged with Barrick Gold Corporation, together with AngloGold Ashanti and Sokimo, purchased the Kibali Gold Mine, formerly the Moto Gold fields, in 2009.

Shift to renewables In an area with sparse infrastructure and no dedicated electricity utility provider, RRL developed the mine into what is now one of the largest gold mining operations in Africa.

Extensive advance establishment works were required, including the provision of a diesel power station and an internal power grid, with all associated transmission lines and substations.

The large Kibali and Nzoro rivers envelope the concession and RRL immediately recognised the importance of developing renewable energy resources.

A preliminary design/scoping study for potential hydropower development opportunities

A perspective of the intake from downstream, showing works at an advanced stage of completion

was conducted; in 2011, RRL earmarked four run-of-river schemes, located within 30 km of the main gold mine. The hydropower projects included sequential construction of the 22 MW Nzoro II HPP, 11 MW Ambarau HPP, 11 MW Azambi HPP and finally the 7 MW Sessenge HPP, over a 10-year period, to provide 49 MW base power to the mine grid.

The gold mine itself was developed in two overlapping phases and Nzoro II was constructed in the first phase between 2011 and 2013. Thereafter, Ambarau, Azambi and Sessenge were packaged into a single turnkey EPCM contract (named the Kibali River Hydropower Plant Projects), which was

later awarded to South African and European contractors who had been engaged on the mine establishment works.

Forming part of the original turnkey EPCM contract, a duplicate set of Kaplan turbine and generating units were purchased simultaneously and stored at the mine, intended for installation at both Ambarau and Azambi before the detail engineering designs had started.

Ambarau HPP was configured as a run-of-river station, comprising a 23 m high symmetrical hardfill dam constructed to create the required water head drop for an integrated hydropower plant. Construction of Ambarau HPP

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Hydropower

Radial gates

commenced in 2013 and the station was completed in 2016.

During its construction stage, RRL opted to terminate the original EPCM model and instead develop Azambi HPP following standard FIDIC white and modified red book contract forms.

Knight Piésold was then appointed for the full engineering design through to construction completion of the envisaged hydropower scheme, inclusive of concept and

detail design studies, procurement and fulltime construction monitoring.

Azambi’s salient features Distinctive features of the Azambi project are the inclusion of a rubble masonry concrete (RMC) gravity diversion weir, reinforced concrete intake structure with sluice and sediment scour facilities, a 1.06 km long, 45 m wide power canal, and an integrated forebay to reinforced concrete powerhouse

to tailrace. The powerhouse is equipped with the two Kaplan turbine and generating units, feeding an 11 kV switchyard and a 7 km long 66 kV transmission line.

From concept stage, engineering designs were required to follow a qualitatively balanced approach, with structural components tailored to suit the available topography, and using materials that were immediately available in the area. All this had to be achieved while maintaining sound international design and best practice quality standards.

The waterway system had to be engineered to achieve rated head and flow conditions for the particular turbine and generator units already purchased, within an unexplored project site. This was a constraint from a design perspective and certainly not the norm.

The option of constructing another large dam and integrated hydropower works was considered, but soon eliminated on the basis of risk and cost. Instead, a small diversion weir and canal system proved to be the most economical, low-risk option for Azambi.

Credit: Terry February

19-08-08_033_ID19150_eAZ_Kapstadt_Imiesa_210x148_RZgp

CAPE TOWN

EFFICIENT SEWAGE SYSTEM State-of-the-art tunnelling technology from Herrenknecht is currently being applied to upgrade the sewage system in Cape Town. 1.2 km of new, sustainable tunnel infrastructure has been constructed with minimal disruption to the local community. www.herrenknecht.com

Construction of the Cape Flats 3 Bulk Sewer – Phase 2 Client: City of Cape Town Engineer: AECOM CSV Construction

Hydropower

Project highlights The following is a summary of the highlights and innovations employed: • The overall project concept was optimised to deliver a low-impact, continuous power by run-of-river operation, utilising local materials, labour and contractors. This included optimising the location of the diversion weir in order to reduce its height and cost, and to allow for the construction of an RMC dam that would promote labourintensive construction (i.e. local training, community involvement and employment).

• The intake structure was designed to facilitate bed load sediment removal by including a forebay sediment trap and vortex de-sander to provide both continuous sediment removal downstream of the trash rack and a guaranteed continuous ecological flow release.

• The headworks were positioned on the left bank of the river, which has gentler topography and a westerly river curvature, resulting in a shorter length of the power canal to attain the required head drop for the turbine rated conditions.

• The 185 m long RMC diversion weir with adjacent radial gate allows for large flood discharge capacity.

• The 1.1 km long power canal with emergency spillway was designed for the required flow capacity and positioned on the topography so that it did not require additional canal lining, thereby reducing costs and promoting the use of local materials.

• A surface powerhouse was configured for the two horizontal axis pit Kaplan-type turbine-generator units.

• Overall optimisation of the project increased the project’s initial average annual energy estimation by approximately 5.3 GWh/year, equivalent to $19 million (R277 million) per year in energy savings.

The project was executed jointly by Knight Piésold’s Canadian and South African offices.

Overall project management responsibility was taken by Knight Piésold South Africa.

RMC construction is ideally suited to labour-intensive construction

and this formed a critical-path activity to allow construction to initiate at the time.

With the wet season approaching, a narrow section of the river was identified, and reinforced concrete abutments were constructed on either side of the riverbank.

A single-span, 36 m long weathering steel girder bridge with 80 t capacity was ordered and fully assembled on the right bank, before being lifted into position with the mine’s 300 t mobile crane. The bridge construction was expedited and commissioned within a week before the wet season arrived.

Project headworks Roads and bridges To avoid community disturbance due to driving through the local village with heavy construction equipment, a new bypass road was constructed, which also followed the alignment of the new 66 kV transmission line to the main substation.

This provided road access for construction right of way and long-term maintenance of the transmission line. A permanent bridge over Kibali River was required to reach the works

The project headworks are positioned at an outside bend of the river, at a location where a small island divided the river naturally.

The diversion weir axis ran over this island, perpendicular to the regional dip of rock strata, to simplify channelling and diverting the river during construction and to minimise the overall extent of foundation preparation.

The headpond is formed by the small reservoir created behind the weir. Since Azambi HPP will not operate as a peaking

station, only limited storage was provided. The weir is constructed to reduce the velocities of approaching river flow while directing water to the intake structure, and to pass flood events in a controlled manor. The headpond will also only settle out a limited amount of sediment and the key silt settlement facilities were installed and managed directly from the concrete intake structure.

The application of RMC for the small weir structure proved to be very successful. While promoting cost savings compared to a mass concrete equivalent, it offered a durable structure that is resistant to flood damage and was constructed with an unparalleled utilisation of labour.

In the end, and despite the need to integrate a myriad of factors and construction elements, Azambi HPP was delivered on time and at a fraction of the comparative final cost of the previous hydropower schemes.

In recognition, it recently won the Best International Project Category at the 2019 CESA AON Engineering Excellence Awards and at the 2019 SAICE Johannesburg Branch Awards.

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WATER & WASTEWATER

Introducing Nafasi Water

A

Following its sale, established water treatment company Aveng Water will now be known as Nafasi Water.

veng Water was recently bought out of the Aveng Group by Infinity Partners, owned by Suzie Nkambule and E-Squared. Now in the process of rebranding to Nafasi Water, the company retains its expert capabilities and remains true to its goal of preserving sub-Saharan Africa’s water while ensuring access to alternative sources for potable and industrial use.

Building on strong foundations With a focus on water reclamation and desalination technology for application in complex industrial and wastewater systems, Nafasi Water began a journey in 2003 to develop, implement and operate world-class industrial desalination projects.

As a 100% black-owned South African leading water technology and water utility service company, Nafasi Water partners with industry, government and local communities to provide sustainable solutions to broader water security challenges. Combining innovative technology with the funding and delivery of world-class water and wastewater treatment projects and services, the company aims to sustainably reclaim water affected by industrial and human activities.

With considerable experience in the design, construction, commissioning and operation of complex water treatment plants, the company boasts three large-scale water treatment plants under its O&M Division. These include the eMalahleni and Middleburg Water Reclamation Plants, along with the flagship Erongo Sea Water Desalination Plant in Namibia. Nafasi

Water was also responsible for the construction and former operation of the Optimum Water Reclamation Plant.

Expert capabilities Nafasi Water provides consulting and contracting services for the mining, municipal and industrial water sectors, specialising in the design and engineering of treatment plants for: • seawater desalination • industrial effluent treatment and reuse • municipal water and waste water reuse • water supply for power generation infrastructure.

For the treatment of mine water, Nafasi Water has developed a unique, internationally recognised product called HiPRO. With this, Nafasi has pioneered the application of reverse osmosis (RO) to treat mine water and achieve ultra-high water recoveries of 97% to 100%.

The HiPRO process achieves its high water recovery through the use of multiple stages of ultrafiltration and RO membrane systems, operating in series, and with interstage precipitation of low-solubility salts. This is applied without the expense of evaporators and crystallisers typically used in the final concentration step. The result is a very small brine stream that can be further treated or discharged into a lined evaporation dam.

Not only does HiPRO produce SANS-quality drinking water, it boasts lower capital and operating costs than other technologies and the recovery of potentially useful by-products.

and capability to offer project financing as build, own, operate (BOO) and build, own, operate, transfer (BOOT) contracts.

As leading providers of complete water treatment solutions, Nafasi Water offers a costeffective water management service, which includes water analysis, utility management, audit and condition monitoring, routine maintenance and equipment renewal.

The company’s unique Sigma Ops monitoring and control system adds to its O&M capabilities, allowing Nafasi Water to extract the longest possible operational life from membranes, even with very difficult to treat feedwater.

Partner of choice “Nafasi Water is a partner of choice for municipalities and organisations in search of full-scale water and wastewater treatment solutions,” says Suzie Nkambule, CEO, Nafasi Water.

“We partner closely with our clients to ensure we add value by developing local capacity through skills transfer. We are proud to be a business that contributes meaningfully to the sustainable development of the geographic markets in which we operate.”

Operations and maintenance Nafasi Water has the commercial experience

+27 10 205 1800

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AMBITIONS FOR

AFRICA

Water & Wastewater

Optimising the treatment process The University of the Western Cape has recently commissioned a treatment plant to treat a blend of borehole water. The feedwater requires a number of technologies and processes to be combined and optimised to ensure the plant meets the required output standards. By Nico-Ben Janse van Rensburg*

T

he University of the Western Cape (UWC) plant has been constructed using a combination of processes and technologies to treat the water. The process is optimised by making use of blends and bypasses – reducing capital and operating expenses, as well as cutting out the need for a stabilisation step.

Removal of monovalent salts Monovalent salts – typically sodium chloride, which mostly makes up brackish and seawater – are not easily removed from water. The exceptionally well-organised crystal structures of these monovalent salts result in a great increase in entropy when these salts dissolve.

When TDS (total dissolved solids) levels need to be reduced to potable levels, or to near-pure levels, reverse osmosis (RO) is a technology that is proven to be significantly more energy efficient than evaporation and produces little chemical waste, excluding the brine produced from the desalination process.

Similar to working with pumps and a hydraulic system, the energy required is usually given in pressure units rather than in joules. In RO, the osmotic pressure refers to the pressure required to break even with the osmotic pressure. This sentence may be rephrased as the osmotic pressure represents the energy released when the salt content is dissolved in the water.

Applying this same amount of energy places a system in equilibrium, which will produce no separation of water and salt.

Typical osmotic pressures for sodium chloride solutions are given in Table 1. The values and ranges therein are taken from experience of typical boreholes encountered.

The separation is performed by a semipermeable membrane, typically made from polyamide.

Removal of iron and manganese Iron and manganese, both considered heavy metals, are not effectively removed

by RO. Further to this, iron oxidising on the membrane surface causes rapid blockage of the membrane, resulting in the frequent need for CIP, which in turn shortens membrane life.

If iron and manganese are present in the water, the first step is to oxidise the iron and manganese to an insoluble state and then remove the particles by means of filtration.

UWC process optimisation At the UWC plant, water from a blend of borehole feeds is to be treated. The boreholes

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Water & Wastewater

Table 1 Typical osmotic pressures

Description Bottled water (from actual label) Tap water Brackish water Borehole water with seawater ingress Seawater

Typical TDS (mg/ℓ) 83 100 –1 200 1 200–2 000 2 000–21 000

Osmotic pressure at 25oC (bar) 0.071 0.086–1.03 1.03–1.72 1.72–18.43

33 000–45 000

29.36–38.33

contain high levels of iron at 2.5 mg/ℓ (SANS 241:2015 specifies 0.3 mg/ℓ or less), and levels of sodium and chloride that are slightly above the limit (SANS 241:2015 specifies 200 mg/ℓ for sodium and 300 mg/ℓ for chloride).

Apart from the levels that are above the limit, there is also calcium in the water at 120 mg/ℓ, which is good, but scaling. The calcium can be reduced to 40 mg/ℓ to provide a stable product water that is neither scaling nor corrosive.

The first step in the UWC plant is to oxidise the iron and elevated pH of 9.5, and then use a manganese dioxide catalyst filter to oxidise the remaining iron.

The iron particles – and other colloidal particles, bacteria and viruses – are

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filtered by means of ultrafiltration (UF).

The UF, therefore, has a dual purpose, for both typical pre-treatment to the RO and for the effective removal of iron and manganese, provided the oxidation process is operating optimally.

As stated above, the removal of monovalent salts takes a significant amount of energy. Since the sodium and chloride levels are so close, it is not required to run the full production through RO. Instead, the calcium levels are used as a guide, and a portion of the water is treated by RO to achieve the desired calcium levels of 40 mg/ℓ.

This results in only 14 m3/h of RO permeate being produced, and the remaining raw water from the UF to be blended to produce a total of

22 m3/h of production. This blend ratio: • reduces the energy required to remove monovalent salts and, therefore, reduces operating expenses while bringing the levels down well within limits • reduces the RO size and, therefore, the capital required to construct the plant • removes the need for a stabilisation step in the process, thereby drastically reducing chemical consumption and operating costs.

Of the critical elements mentioned in this article, final water quality shows these to be well within specifications. The following values were attained from a SANAS-accredited laboratory from the final water produced at this plant: • Chloride: 103 mg/ℓ • Sodium: 88.6 mg/ℓ • Iron: <0.024 mg/ℓ (below detection limits).

Stability of the water, as calculated by the Langelier Saturation Index, is -0.06, which is very close to the optimal zero. *Nico-Ben Janse van Rensburg is a process engineer at QFS

Water & Wastewater

The power of anaerobic digestion Given the right process conditions, wastewater treatment plants create invaluable oppor tunities for renewable energy. Chris Braybrooke of Veolia Water Technologies South Africa discusses the strategic impor tance of anaerobic digestion in South Africa’s energy, economic and environmental future.

V

eolia’s goal for South Africa’s wastewater treatment facilities with suitable chemical oxygen demand (COD) effluent conditions is to help these plants become 100% energy selfsufficient by utilising their waste as an energy source. In addition to the obvious advantages this will bring to operating and waste disposal costs, it will also help reduce energy demand on South Africa’s national power grid and, by extension, reduce the requirements for coal-based energy, lowering carbon emissions.

The science behind one the key technologies of such plants is simple: they use anaerobic biological digestion to compost organic matter, which produces biogas (mostly methane) that is then harvested and used as a fuel for the plant’s heating and cogeneration requirements. Such systems have already been installed or are being piloted by Veolia South Africa for companies in the food and beverage and municipal sectors, including Distell and eThekwini Municipality.

Veolia’s Memthane anaerobic membrane bioreactor is designed for treating high-strength effluents such as high-concentration streams (up to 250 000 ppm); ethanol waste; fat, oil and grease streams; starch slurries; and highCOD chemical applications. Memthane is being

used to achieve up to 100% energy and heat requirements in applications such as distilleries through biogas production, while efficiently treating complex compounds and reducing disposal costs.

For industrial effluents with significantly high amounts of suspended solids, Veolia manufactures the Biobulk completely stirred tank reactor (CSTR) – the Memthane combines anaerobic biological wastewater treatment and ultrafiltration in a single anaerobic equivalent to the process that is ideal for high-strength wastewaters, conventional activated sludge digestion resulting in crystal-clear effluents system. This solution is used by Distell to lower the COD load in the outfall to Stellenbosch Municipality, harvest the energy contains approximately 75% methane and can be in the wastewater for reuse, and lower the overall utilised to provide the energy needs of the entire cost of effluent treatment. wastewater treatment plant in a combined heat and power unit.

Upflow anaerobic sludge Completing Veolia’s anaerobic treatment range blanket (UASB) is its integrated fixed film activated sludge system Across the world, Veolia’s Upthane UASB (AnoxKaldnex Hybas); moving bed biofilm modular treatment system has been used to develop over reactor (AnoxKaldnes Z – MBBR); and expanded 500 energy-neutral sewage treatment plants – granular sludge blanket (Biobed) systems. and other low-strength wastewater applications Creating syngas from sludge – utilising anaerobic microorganisms. The biogas Veolia’s research and development team in France is currently experimenting with a new Veolia’s Biolbulk completely stirred tank reactor tiered gasification technology to transform is used by Distell to treat effluent and sewage sludge into energy-rich synthesis gas. harvest biogas for use as a fuel In gasifying sewage sludge, using a mixture of steam and oxygen at 700°C to 1 000°C, results to date have demonstrated the technical feasibility of the process in terms of producing a high-energy-potential gas, rich in hydrogen and methane. This research and innovation process responds to Veolia’s desire to gradually make its various wastewater treatment sites energy-independent.

“By using the energy generated from their own waste, wastewater treatment plants could in the future reduce their environmental impact along with their energy bills, ultimately becoming self-sufficient in their energy requirements,” Braybrooke concludes.

Water & Wastewater | INFRASTRUCTURE DEVELOPMENT

The uMkhomazi Water Project The answer to future regional supply, the uMkhomazi Water Project, upon completion, will be one of the largest bulk water infrastructure schemes constructed and operated in South Africa.

Thami Hlongwa, chief executive, Umgeni Water

Smithfield Dam: Volume: 251 million m³ Max wall height: 81 m FSL: 930 masl

P

1

uMWP: PSC 20 August 2014

rogress continues to be made with preparations for implementation of the multibillion-rand uMkhomazi Water Project Phase 1 (uMWP1) in the wake of growing optimism that water delivery to eThekwini Metro’s Western Aqueduct by 2027/28 still remains a possibility.

In a significant endorsement of the project and its strategic importance, Umgeni Water and the Trans-Caledon Tunnel Authority (TCTA) received approval from the Minister of Water and Sanitation to go ahead. This was in the form of a Ministerial Directive, issued in February 2019, which also defines the roles and responsibilities of Umgeni Water, TCTA and the Department of

Water and Sanitation (DWS) – the custodian of South Africa’s water resources.

• In terms of Section 103 (2) of the National Water Act (No. 108 of 1997), TCTA will fund and implement the raw water component.

• In terms of Section 29 of the Act, Umgeni Water will fund and implement the potable water component.

• Umgeni Water will develop a financial model to fund the potable water component.

• A project office will be established from where Umgeni Water and TCTA will jointly coordinate implementation of the bulk and potable water components.

• Staff will be seconded by both Umgeni Water

Phase 2: Impendle Dam

Existing Umlaas Road Reservoir

Phase 1: Smithfield Dam

WTP

2

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2 IMIESA October 2019

and TCTA in order to ensure requisite skills are available.

• There will be capacity building and transfer of skills, which will enable Umgeni Water to deliver on similar large projects in future.

• TCTA will take all reasonable measures to ensure water delivery by 2028.

Umgeni Water, TCTA and DWS officials are already working closely to resolve institutional, financial and project coordination hurdles and to also facilitate implementation of the project. Their joint efforts will ensure that preparations for implementation, which at this stage are largely in the environmental sphere, are executed timeously.

Progress to date has included agreement on the development of two project charters, one by TCTA and the other by Umgeni Water. TCTA has completed work on a draft project charter while Umgeni Water is working on its charter and the overall project charter.

Issues that have the potential to cause project delays Past occurrences show that environment-related objections have great potential to stall the implementation of projects, leading ultimately to delayed completion and commissioning. An example is the outcomes of an avifauna study that was done as part of the environmental impact assessment (EIA) for the uMWP-1.

The study concluded that the site of the proposed balancing dam is likely to adversely impact – from moderately to severely – the habitat of the endangered blue swallow bird species and their future nests. The investigation also recommended that tunnelling and blasting take place while the blue swallows are in migration.

Umgeni Water has since made changes to the system configuration, including excision of the balancing dam. Extensive discussions have been held with eThekwini Metro and approval obtained regarding the risks associated with not building the balancing dam.

Submission of an amended application for EIA to the Department of Environmental Affairs, Forestry and Fisheries (DEFF) is expected to occur by November 2019.

Water & Wastewater | INFRASTRUCTURE DEVELOPMENT

Investigating the best approach The uMWP-1 has been identified as the most financially viable option to sustainably meet the long-term water requirements of domestic and industrial water users in the Inner and Outer West areas of eThekwini and parts of Pietermaritzburg.

There is widespread concern in political and business circles that further delays could impact negatively on economic growth in eThekwini and Msunduzi, and on household consumption.

The most recent mandatory water restrictions in the Mgeni System, including eThekwini, were lifted in July 2018 after the end of a protracted drought. The restrictions were 15% for domestic, commercial and industrial, and 50% for irrigation users.

Reconciliation studies conducted by the Department of Water and Sanitation triggered alarm bells when it was concluded that the water requirements of Durban’s Western Aqueduct would not be met in full without augmentation of the Upper Mgeni System (Mearns Weir, Spring Grove Dam and Midmar Dam).

These studies showed that the long-term water requirements of eThekwini Metro, Msunduzi Local Municipality and surrounding areas would exceed the assured yield of the entire Mgeni System (Midmar, Albert Falls, Nagle, Inanda and Spring Grove dams, and Mearns Weir) from 2016. This system’s deficit would increase to 202 million litres per annum in 2040.

In an attempt to manage this potentially serious risk, Umgeni Water investigated wastewater reuse and seawater desalination as possible alternatives to a conventional water storage, treatment and supply scheme.

However, reuse and desalination were ruled out as expensive short-term solutions, and it was found that supply derived from these sources would soon be outstripped by demand.

The uMWP-1, therefore, emerged as the preferred option.

Factors that favoured the uMWP-1 It will be a gravity scheme and consequently carry lower energy requirements and associated operating costs. An additional advantage is that it will be able to meet increasing demand in the long term (>25 years) and it will also be financially viable, especially in the context of capital and operating costs.

Conditional on obtaining EIA authorisation, it is anticipated that design for the uMWP-1 could begin in early 2021. The tunnel is on the critical path and it will take about five years to construct. If construction of the tunnel begins by 2023, commissioning of the scheme could be between 2028 and 2030.

What the uMWP-1 will comprise and its magnitude The uMWP-1 will be comparable to the Lesotho Highlands Water Project Phase 2 in terms of volume, tunnel length and diameter.

The following are the components of the scheme: Raw Water Component: • Smithfield Dam, situated on the uMkhomazi River where it passes through the Ingwe Local Municipality • a 33 km tunnel from this dam to Baynesfield • a 7.5 km raw water pipeline • based on current estimates, approximately 1 487 ha land will be required for Smithfield Dam. Potable Water Component: • 625 Mℓ/day water treatment plant at Baynesfield, which will be supplied by the 7.5 km raw water pipeline • 19.4 km 2.8 m diameter potable water pipeline to Camperdown. This pipeline will ultimately supply the Western Aqueduct.

Mega investment “Based on 2014 figures, the DWS’s portion was estimated to be R14 billion and Umgeni Water’s portion was estimated at R8 billion,” explains Thami Hlongwa, chief executive, Umgeni Water.

“However, these estimates are conservative at present-day construction, material and labour costs, and it would not be off mark to suggest that, in 2019, the estimated total cost of completion could be in the region of R26 billion.

This project is vitally needed, which then makes it a sound financial investment in the future water needs of our region.”

Possible sources of funding of Umgeni Water’s portion of cost are borrowing on the open market, grants from the DWS and Umgeni Water’s balance sheet.

Future expansion of the uMWP-1 Water produced by the first phase of the uMWP-1 (625 Mℓ/day) will be supplied exclusively to eThekwini Metro and will be sufficient to meet eThekwini Metro’s demand projections for at least 25 years if it is commissioned in 2025. From this point onwards, Phase 2 of this scheme, which will be able to produce an additional 600 million litres per day of potable water, will be required.

However, if eThekwini Metro’s water demand, beyond its current level, remains below 500 million litres per day, Phase 1 will most likely meet this need for more than 40 years.

Phase 2 will only be required once this additional demand exceeds this limit.

Phase 2 will comprise a dam at Impendle, outside Pietermaritzburg. This segment of the scheme will only be required, in the best-case scenario, in about 2050. Further infrastructure would be a duplication of the tunnel, pipelines and increased treatment capacity.

These projections are based on eThekwini Metro’s Spatial Development Planning processes and are calculated on an assumed growth rate of 1.5% per annum between 2013 and 2053.

One of the major benefits of the uMWP-1 is that it will bring into use water from an underutilised source – the uMkhomazi River Catchment. It is estimated that between 10% and 15% of water in the uMkhomazi River ultimately makes its way into the sea, and is lost. uMkhomazi is among the three largest rivers in KwaZulu-Natal. The other two are the uThukela and Umzimkhulu rivers.

“The uMkhomazi Water Project, through heightened security of supply, will play a pivotal role as a catalyst for future growth within eThekwini. By creating capacity within the Upper Mgeni System, it will also contribute to further socio-economic development within the uMgungundlovu and Msunduzi regions by making more water available to these customers,” Hlongwa concludes.

www.umgeni.co.za

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Water & Wastewater

Addressing vulnerabilities Outcome 9 of the Medium Term Strategic Framework (MTSF) 2019-2024 calls for 100% access to safe and affordable water and sanitation, and a 15% reduction in non-revenue water by 2024. If this is to be achieved, water services authorities (WSAs) need to understand and address their weaknesses and vulnerabilities.

By Danielle Petterson

T

here are a number of challenges to the delivery of reliable, safe water in South Africa. These range from ageing infrastructure, shifting demands and resources, to poor planning, competing political priorities, a lack of skills and finance, and more.

Allestair Wensley, chief engineer, Department of Water and Sanitation (DWS), argues that, in order to address these myriad challenges, WSAs must be able to identify and address their areas of vulnerability. This can be done using the Municipal Strategic SelfAssessment (MuSSA) System â&#x20AC;&#x201C; an annual assessment that allows WSAs to determine their overall business health in order to better deliver services.

The award-winning MuSSA system has evolved since its development in 2008.

The assessment includes 18 key business health attributes, which are assessed by asking five strategic questions per attribute, to help WSAs determine their level of vulnerability. Thereafter, the

The 18 key business health attributes assessed by the MuSSA

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IMIESA October 2019

aim is to address vulnerabilities, improve delivery of reliable services, monitor issues confronting WSAs and direct support.

The MuSSA is not a regulatory tool but rather a self-help tool that is fully aligned with all other planning processes. The DWS is constitutionally obliged to report to the Presidency on municipal vulnerability per WSA via MuSSA in terms of Outcome 9 of the MTSF.

National conclusions Nationally, 40% of WSAs reflect extreme vulnerability, while another 38% reflect high vulnerability, reports Wensley. A combination of weak finances, poor operations and maintenance of assets, and weak technical capacity has resulted in elevated vulnerabilities in service provision attributes, most notably wastewater, environmental safety and regulatory compliance. â&#x20AC;&#x153;There is a high vulnerability throughout the country, and the diagram never changes,â&#x20AC;? says Wensley. However, he points out that it is important to note that vulnerability does not imply immediate dysfunctionality, but rather that the business is not operating ideally.

Responses show that 64% of WSAs are not implementing an appropriate water and sanitation services plan and 58% have not developed a suitable WC/WDM (water conservation/water demand management) plan. Furthermore, 53% indicate that wastewater treatment works are fast approaching capacity, while a further 51% report that water treatment works are nearing capacity, and 44% indicate a water shortage of more than 20% of current needs.

Water & Wastewater

A look at SA’s WC/WDM According to Wensley, using the qualitative data it is possible to monitor the country’s non-revenue water (NRW) performance based on feedback from the MuSSA. Section 6 of MuSSA asks five questions pertaining to WC/WDM: Your WSA has developed a councilapproved WC/WDM strategy that includes a standard water balance (e.g. modified IWA).

Please indicate your percentage of NRW as per the modified IWA water balance.

System input volumes (bulk) to the WSA are accurately monitored using calibrated bulk meters (e.g. check metering).

Please indicate what percentage of all connections are metered and billed (residential and non-residential (commercial, industrial, etc.)) on a monthly basis.

Your WSA is implementing appropriate intervention programmes to reduce NRW (e.g. minimisation of night flows through press management, removal of unlawful connections, leak detection and repairs, consumer educations/awareness).

Having received the MuSSA results from 142 out of 144 WSAs, the DWS was able establish that the national NRW average has increased slightly from 36.39% 2015 to 36.55% at present. It must be noted that this is on the conservative side of many sector estimates and the percentage could in fact be much higher.

The regions with the highest levels of NRW are KwaZulu-Natal and the Eastern Cape. Encouragingly, these provinces have shown an increase in WC/WDM planning and assessment. However, there has been a

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decrease in the four remaining assessment areas, states Rivonia Pillay, candidate civil engineer, DWS. Even the best performing region – the Western Cape – showed a slight decrease in strategic planning, input volumes monitored, and connections metered and billed. However, interventions implemented increased drastically, which significantly decreased the percentage of NRW. Pillay also provides an overview of the nine WSAs in Gauteng, which shows a high level of vulnerability. Only Ekurhuleni and Johannesburg score low on the vulnerability scale. The main vulnerabilities in the province, identified in the complete MuSSA, were financial asset management, technical staff capacity, and wastewater and environmental safety and regulatory compliances.

Gauteng has seen a slight decrease in NRW from 36.11% to 35.5%, which, although encouraging, is not substantial. Unfortunately, WC/WDM planning showed a decrease, and it was found that one WSA has no WC/WDM plan, while another only has a water balance. System input volumes have increased, but connections metered and billed have decreased.

Between 2015 and 2016, there was an improvement in the number of NRW intervention programmes implemented; however, this was followed by a decrease between 2016 and 2018. “We need to go back and assess why this is happening in terms of the entire business of the municipality,” says Pillay.

She goes on to list three areas of focus for Gauteng WSAs to lower their vulnerability when it comes to WC/WDM: 1. Ensure that WC/WDM plans are properly developed and updated moving forward.

2. Increase metering and billing of connections.

3. Significantly increase the NRW interventions implemented on the ground.

“Knowing that WC/WDM is a hotspot leg, we can look at the other 17 legs of the MuSSA to see what else is influencing this sector.

Vulnerabilities could be linked to staff skills and capacity, O&M, or finances. The results should help us to navigate where to focus our resources.”

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Water & Wastewater

Specialised water storage solutions Piet Coetzer, chairman: Structa Group

What range of utilities services does Structa Technology provide?

PC Our main aim is to support the public sector – specifically municipalities, water utilities, schools, hospitals and clinics – in its water infrastructure roll-out programme.

We are one of the preferred suppliers of water storage tanks to municipal authorities and mines because we are known to deliver on time and within budget, while adhering to the best quality standards. Our 40-year-old Prestank brand has proven itself as a hygienically safe, cost-effective and reliable way to store water for community, commercial and private needs.

How does Structa Technology partner with municipalities to improve service delivery?

Structa Technology not only provides municipalities with a durable product that is cost-effective and easy to maintain, but our philosophy

Meyerton-based Structa Technology, a member of the Structa Group of Companies, provides much-needed water storage to rural communities throughout South Africa.

IMIESA talks to Piet Coetzer, chairman: Structa Group, about the company’s range of products and services. is to partner with local contractors for foundation construction and installation. In this way, we support the respective municipality’s localisation policy and create much-needed jobs.

Tell us more about Prestank’s storage capabilities.

Our Prestank water storage tank is the ideal water storage solution for volumes of 10 000 litres and above. Structa Prestanks are fully customisable, high-quality water storage solutions that are manufactured according to SANS guidelines and meet South African hot-dip galvanising requirements.

They can be used for various water storage applications such as temporary or permanent installations at mines, power stations, building sites, hospitals, municipalities, rural communities and agriculture.

Prestank now also offers a wider range of associated tank products and services, which include: • Roddy tanks, which are smaller,

welded-steel round tanks with up to 10 000 litres of capacity; these tanks are robust, durable and hot-dip galvanised, requiring minimal maintenance • tank inlet and outlet piping for both small and large tanks • foundation construction, and in some cases precast foundations • tank refurbishment solutions.

What makes your products and services an ideal solution?

Structa’s pressed steel sectional tanks are hot-dip galvanised for corrosion control in accordance with the requirements of the SANS 121 (ISO 1461) galvanising standard. The thickness of the hot-dip galvanising coat is applied with a range of 80 µm to 100 µm – more than five times the thickness of zinc on pre-galvanised

corrugated steel cylindrical tanks. The purpose is to ensure an extended, maintenance-free life for the storage of water with aggressively corrosive properties.

Structa prides itself on thorough engineering in the design and development of its respective tank ranges. The most modern finite element analysis techniques are employed in our product design and our tanks are thoroughly tested to withstand the requirements of SANS 10329, as well as being fatigue tested to ensure longevity of welds and panels.

All tank products are manufactured under ISO 9000 conforming quality programmes and all our products have a recorded material and manufacturing history, resulting in a top-quality, wellengineered product.

IMIESA October 2019

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Dams & Water storage

Keeping urban dams clean and safe Dams in urban areas can be either an asset for recreation or a liability if polluted. Measures like automatic scour and crest gates are highly effective in countering flotsam and sediment build-up while retaining optimum storage capacity.

By Peter Townshend*

D

ams such as Emmarentia Dam in Johannesburg or the lakes in Benoni are attractive water features and enhance the quality of life for the community, especially where fishing and boating occur. These dams have catchments that are predominantly developed residential areas where the run-off has low pollution and litter loads.

ABOVE 2 m high crest gates BELOW LEFT An effective litter trap upstream of the dam offers an advantage in reducing the eyesore view of litter strewn along the banks and the biodegradable material in the dam

However, dams on watercourses that drain from high-density city areas or developing sites with informal settlements can and have

caused considerable problems and are then liabilities for the local authority.

One such feature was Bruma Lake on the Jukskei watercourse, which drains from the high-density areas of Hillbrow and Berea in Johannesburg. Initially, it was a big attraction with prestigious office blocks, shops and restaurants on the waterfront; however, over the years, it became highly polluted

An automatic scour gate discharging sediment-laden water from a river weir

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IMIESA October 2019

hORIZONTAL dRILLS

JT10

and an environmental hazard. The standing polluted water with high E. coli counts became anaerobic, releasing unpleasant odours.

Further litter and debris, emanating from urban areas, were strewn along the watercourse and in the lake.

The Bruma Lake problem was solved by filling it in and returning the watercourse to a natural stream. Similar adverse conditions were also experienced at Centurion Lake on the Hennops River, also resulting in its eventual drainage and closure.

Countermeasures Given rising pollution trends, thereâ&#x20AC;&#x2122;s a fair chance that similar problems are currently developing or occurring at other water features and dams in urban areas or municipal boundaries across South Africa. The good news is that there are ways to improve the functioning of such dams.

Automatic scour gates can be fitted to the base of the dam spillway or embankment; these open automatically when the water level rises in the event of a heavy rainstorm in the catchment. A considerable amount of sediment emanates from disturbed development and building sites, which accumulates in the dam.

This can soon render the dam ineffective, which was the case with Rattrayâ&#x20AC;&#x2122;s Weir on the Braamfontein spruit in Randburg. It was once a pleasure resort in the early 1900s, with boating and fishing, but is now totally silted up.

The scour gates will open automatically in heavy flows to pass the sediment through the dam or weir while the sediment is still in suspension or rolling on the river bed. The gates will then close automatically to retain the full supply level.

It is possible to allow the scour gates to draw down the water level in the dam slightly below the full level and then close so that the dam fills with relatively clean antecedent run-off.

The gates can also be opened manually to drain the water feature, if necessary, to clean it out occasionally.

Scour and crest gates Automatic gates fitted to the crest of the spillway will also open automatically in floods to decant the debris- and flotsam-laden surface water from the dam. They also close automatically after the flood has passed to retain the full water level. A combination of scour and crest gates works well on low spillway heights of up to 12 m, to keep the dam relatively free of sediment and pollution.

An effective litter trap upstream of the dam offers an advantage in reducing the eyesore view of litter strewn along the banks and the biodegradable material in the dam.

Automatic spillway gates can also be used to increase the storage capacity of urban dams, especially those that have extractions for water treatment works or urban irrigation.

Again, these gates will open automatically to pass floods and close again to retain the full supply level.

By using these gates, small dams have had their capacity doubled following a water rise increase of as little as 600 mm. Larger regional dams would benefit with larger gates, which can increase storage capacity by about 50% depending on the dam characteristics.

With droughts more common now as a result of global warming, additional storage in regional supply dams is important. These gates can be fitted within a few months and meet dam safety requirements. *Peter Townshend, Pr Eng, is the managing director of Amanziflow Projects.

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Construction Law

Practical solutions to avoid conflict and disputes in construction contracts Dispute avoidance is not rocket science â&#x20AC;&#x201C; it is simply applying common sense, working methodically, being proactive and recording and filing information systematically. All members of the construction team need to be on board to make this possible. By Natalie Reyneke*

D

ispute resolution procedures in a contract may be timeconsuming and expensive.

Generally, parties use legal experts to draw up adjudication or arbitration papers because disputes often involve complex contractual issues. Ideally, the parties to a construction contract should try to avoid the dispute arising at all. But how practical is this?

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IMIESA October 2019

There are various stages of project execution, including agreeing on a common project definition, as well as business planning and risk identification. The aim is to finish the project on time, within budget and to quality requirements.

At municipal level, tendering procedures are governed by legislation, but there does not seem to be a requirement

Natalie Reyneke, associate, MDA Attorneys

CONSTRUCTION LAW

to use the most appropriate contract form for works. All too often, we see ser vice-level agreements appropriate for air-conditioner maintenance ser vices, for example, included with RFQs for completely dif ferent works, like the design and build of a water treatment plant.

Pre-contract Avoiding conflicts and disputes during the project execution or construction phase begins before the contract is even signed.

There are various contracting options, procurement methods and execution methods for both the design and construction phases. Not only is the work in each phase quite different, the risks are also different and, therefore, the project team needs a good understanding of the various options. For instance, a design and build contract may make it difficult for an employer to change a poorly designed brief without incurring significant delays and additional costs. When the project documentation lacks crucial information, disputes may arise that could have been avoided had suf ficient consideration been given to all options and stages of the project.

Documentation and legality Documentation is required for construction projects across all methods of construction. It is crucial that contracts and documentation are appropriate to the construction works.

Before construction can begin, all statutor y requirements must have been complied with or the instruction to commence would be outside of the law. If so, the contractor can refuse to work.

Contractors can claim for time extensions and costs in the event that they are issued with a stop order by an inspector from the local authority. This is often the first delay event claimed on a project.

While it sounds obvious, required information needs to align with the construction programme. Assuming that the construction programme accepted by all par ties is reasonable, issuing information late could give rise to claims

from the contractor. The quality and presentation of construction information can also have serious consequences for the contractor – errors in dimensions, and contradicting information between drawings, specifications and bills of quantities are two examples.

Practical tips from a construction law specialist Effective and proper communication under a contract is key. To achieve this, I advise clients to establish a communication protocol in the early phases of the project.

Create stationer y for the project that clearly identifies the purpose of each document (contract instruction, notice, certificate, etc.) to make it simpler to act appropriately and file all communications. Similarly, drawings should be clearly identified so that all parties immediately know whether they should be regarded as preliminar y, for construction, or for information only.

Reports, meeting minutes and instructions should be concise, use short sentences and communicate in simple English.

Project kick-of f workshops can be extremely valuable to the project team.

All members of the project team should be present to gain a proper understanding of the content of the contract, lines of communication, expectations, rights and obligations.

There are a number of standard-form contracts used in the construction industr y, and although the principles and concepts are the same, they each contain specific guides to the execution of the works, situations when either party needs to give notice, respond to instructions and to make payment within an

agreed-on time period or risk being in default of the contract.

Nobody likes to ser ve notices – it is uncomfor table and often feels confrontational. For this reason, I explain to clients that it is the employer who provides the contractor with the contract.

By doing so, the employer invites the use of the provisions of the contract, including claims provisions.

Whatever you do, don’t put the contract into ‘file 13’ and pull it out when something goes wrong!

Proper recordkeeping of communications is vital (par ticularly notices that comply with the contract), design documentation, instructions, payment cer tificates and programme revisions.

All standard-form contracts incorporate dispute resolution clauses and envisage amicable settlement. Being organised and ensuring your claim is valid will encourage the other party to seek a resolution before proceeding moving to adjudication or arbitration. In my experience, submitting a poorly set-out and documented claim does not encourage the assessing engineer or project manager to find in your favour. Even though the claim may be valid, this is a breeding ground for disputes.

My parting advice is to be clear about what constitutes completion of the works, as the various standard-form contracts use different terminology when it comes to completion (practical completion versus taking over of the works, for example). It is generally accepted that a project is not complete until all relevant paper work has been completed – this applies to ‘as-built documentation’, product or ser vice warranties, and operational information needed by the employer to operate and maintain the building or plant over its lifespan.

When payment terms are structured around the achievement of this milestone (or any milestone, for that matter), it is key to have a properly defined trigger for that payment. Once the contractor’s specified obligations have been completed, the contract administrator will issue a certificate of completion, which generally commences the defects liability period. *Natalie Reyneke is an associate at MDA Attorneys.

IMIESA October 2019

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Pipes, pumps & valves

Take a look inside your pipes South Africa’s ageing pipeline infrastructure is under increasing stress.

Pipe condition assessment allows utility owners to assess the deterioration and remaining life of pipelines to inform asset maintenance and replacement strategies.

A

verda’s Pipe Inspection Division is responsible for assessing the condition of underground waste systems, namely sewer, stormwater and effluent pipelines.

Using specialised equipment designed to monitor the performance or structural integrity of these pipelines, Averda is able to supply clients with accurate, repeatable data to inform asset management strategies.

CCTV pipe inspection cameras are used to assess or inspect the condition of these pipelines, providing a visual indication of the repair and/or maintenance requirements.

Added to this is laser pipe profiling technology, which measures any deformation or corrosion within these pipelines that cannot be determined with CCTV alone.

Using the combined technologies, it is possible to determine the maximum corrosion, debris and ovality.

Benefits of Averda’s services Clients are faced with a myriad of problems relating to poorly per forming pipeline infrastructure. These can include: The pipelines have already collapsed or are blocked and over flowing, therefore polluting the environment and damaging other infrastructure such as streets, roads and buildings.

The sewer or stormwater system is not functioning properly and maintenance is required.

An assessment is required to determine the cause of a problem in a pipeline, often a result of a lack of maintenance.

The client is not aware of the location or condition of its pipelines.

The client requires verification or quality assurance on the workmanship of a newly installed pipeline.

Before a catastrophic pipeline

1 2 3 4 5

failure occurs, Averda can inspect and pinpoint the exact location of the problem.

By proactively assessing the condition of the pipeline, data is collected and clients are advised on the best solution to the problem – this can be either to repair or maintain.

Averda can give a report on defects and costs of repairs and maintenance, while advising on best practice and the best solutions for the client. This helps inform the client’s decision as to whether to rehabilitate or replace infrastructure, while also prioritising their budget spend. Condition assessment should always precede rehabilitation.

The ultimate benefit of proactively assessing the condition of pipelines is that Averda can also develop a detailed map of underground pipeline infrastructure using geographic information systems (GIS) to produce an accurate asset register.

www.averda.com

IMIESA October 2019

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stand us at t i s Vi

Pipes, pumps & valves

Optimising multistage performance High-head pumps play a critical role in areas like bulk water delivery, which makes selecting the right product equally important.

A

Proudly South African company, Mather+Platt and its group company APE Pumps are original equipment manufacturers (OEMs) with a product history in the local market dating back to 1952.

Mather+Platt manufactures horizontal multistage pumps designed for high-pressure applications, and split-case pumps chiefly for high volumes. In turn, APE Pumps specialises in the design and manufacture of vertical industrial turbine pumps, split-case and endsuction pumps for most industries. APE

Pumps and Mather+Platt also provide an installation and commissioning service. All products are designed, cast and assembled in South Africa.

What sets them apart is their ability to devise standard and custom-designed solutions across the entire fluid transfer spectrum.

Within the public sector, this includes bulk water transfer systems for municipalities and utilities. Here, Mather+Platt leads with its PL/PJ range of multistage centrifugal pumps.

High-head duties These pumps, available either in horizontal or vertical configuration, are designed for a wide range of high-head duties at sustained highest efficiencies. This makes them particularly well suited for applications that include high-lift mine drainage duties, mainline water supply, and high-pressure boiler feed pumps operating at elevated temperatures. They feature a heavy-duty, ringsection design and robust fabrication.

Incorporating the latest hydraulic design principles, the materials used in their construction are selected to ensure the compatibility of rotating and stationary wearing parts, combined with high corrosion and erosion resistance.

The end result is prolonged life, sustained efficiency and low maintenance costs.

The PJ250AS vertical five-stage model manufactured by Mather+Platt

A Mather+Platt PJ250H five-stage horizontal pump

High heads are achieved at standard direct coupled motor speeds of 1 480 rpm for PJ pumps and 2 960 rpm for PL units, both generated via a 50 Hz electrical supply. These pumps are also suitable for operation at other speeds, including those applying when direct coupled to two- or four-pole motors fed by a 60 Hz supply. A key benefit of these pumps is their relatively compact size and energy savings.

The PL/PJ system design further allows for direct drive from power recovery water turbines of the Pelton wheel type and for direct or indirect drive from virtually all other alternative forms of prime mover.

“Every project and installation has its unique requirements and we have the in-house design and engineering expertise to devise the optimal pump and process match,” says John Montgomery, general manager, APE Pumps and Mather+Platt. “That includes the need for ease of access during routine maintenance.”

On these pumps, the bearing brackets and bearing bushes are designed with a horizontal split along the centre line. The main advantage is the ability to strip the bearing assembly without disturbing the alignment of the element, and without having to remove the pump, half coupling or driving unit. Additionally, the bearing brackets are supported at the top and bottom, thereby avoiding distortion of bearing bush/shaft alignment when the pump is under pressure.

The balance valve assembly is designed to enable the wearing parts to be replaced at minor cost. The stainless steel balance valve head will never have to be replaced, since it’s provided with a separate wear face.

“This is one of a series of examples of how we build durability and practicality into our PL and PJ series,” Montgomery concludes.

IMIESA October 2019

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HOW DOES CORROSION AFFECT YOUR SYSTEMS?

Pipes, pumps & valves

Relief for drought-stricken Sutherland

A

n ongoing six-year drought in Sutherland in the Karoo is having hard-hitting effects on farmers and their livestock, as water levels continue to drop.

Although farmers generally prepare for oneto two-year droughts, the current extended drought has left Sutherland’s terrain under severe stress, with underground water tables dropping and plant life dying off.

Sheep farming forms the backbone of the Sutherland economy, with the number of sheep in the area typically amounting to around 400 000. In April, Sutherland’s sheep population sat at just 57 000, as sheep continue to die in high numbers due to hunger or being unable to fight bacteria as a result of the drought.

The economy has taken a severe knock and farmers, farm workers, and all the families who are dependent on farming in the area are facing increasing financial stress.

Although the area is expecting to receive rain, it is predicted that the rains will only allow sufficient food growth of 30% for the current livestock numbers. That means that the area will be dependent on donations and feed being brought in from outside areas.

The Karoo, the central high plateau of South Africa, gets as little as 400 mm of rain annually, which falls mainly in summer.

The winter months are almost completely dry. Sutherland itself sees about 243 mm of precipitation annually.

The Gouritz River catchment area that covers the bulk of the Karoo region has seen an increase in average dam levels for the first time in 2019. That average level currently stands at 19.3%. This includes the Gamka Dam in Beaufort West, which is currently only 9.4% full.

allow for pipes to be sunk deep enough to access the currently available water.

Grundfos, together with Gift of the Givers and Save the Sheep, stepped in to assist with drilling for water in the area for all farmers who need it. The demand quickly grew for water to be pumped for livestock as well as irrigation.

Grundfos has been assisting with drilling boreholes and the installation of pumps, enabling farmers to access the area’s groundwater resources. An offer was also made to farmers of an additional pump bundled into the purchase of the initial discounted purchase price.

The company’s installation agents are putting together pumps with all the necessary infrastructure in place so that farmers only need put the pump in the hole and connect the switch. This means that in less than 45 minutes, the whole pump is set up and water is flowing. Currently, just over 130 holes are left to be bored.

“Nothing prepares you for what these farmers are going through. To see tears roll over the cheeks of a farmer at the first site of water really affirms why we do what we do,” says Willandri Cockroft, marketing manager, Grundfos South Africa.

The first 30 pumps have been bought and, at the current rate, are pumping more water than was expected. Gift of the Givers is helping to finance the pumps to ensure greater affordability for farmers in the area. Starting with Sutherland, the goal is to spread to the rest of the Karoo, providing muchneeded relief as far as possible.

The Karoo, the central high plateau of South Africa, gets as little as 400 mm of rain annually, which falls mainly in summer

Grundfos brings relief Through the Save the Sheep campaign, a savings fund has been established and a borehole campaign put in place. Around 208 boreholes were planned for the area; however, appropriate pumps were needed to access the water table. Borehole water in the area is usually lifted by wind pumps, but these do not

IMIESA October 2019

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RE-IM A GIN E D L OOK .

SAME TECHNOLOGY-DRIVEN COMPANY.

www.utility-systems.co.za enquiries@utility-systems.co.za +27 31 700 4143

S M A R T WAT E R MANAGEMEN T

Pipes, pumps & valves

Debunking the myths around HDPE mechanical joining Although fusion is often considered the top joining method for HDPE, Marcel Ley, regional manager, Victaulic South Africa, argues that mechanical joining is the best method to ensure job site safety, reduce completion time and provide financial benefits.

F

or years, butt fusion and electrofusion have been considered the top joining methods for HDPE piping; however, Ley argues that people commonly overestimate the performance advantages of fusion and, until now, it has been widely accepted as the easiest, most efficient method for joining HDPE pipe.

Although mechanical joints are widely embraced in metallic piping applications, many highlight concerns surrounding the performance and reliability factors of mechanical joints in relation to HDPE piping. According to Ley, many myths still persist across various industries, leading practitioners to believe that mechanical joining is not a suitable method to consider.

or non-destructive manners in which to inspect the quality of the joint,” he says.

Myth 1 The first myth is that HDPE piping with mechanical joints does not perform optimally when buried.

“Victaulic’s mechanical joints have been specifically designed with buried applications in mind. Victaulic’s products have been fabricated out of durable ductile iron housings and fluoropolymer-coated hardware, ensuring that Victaulic couplings are protected against an array of conditions,” says Ley. If additional protection is required, supplementary coating and wrap options are available.

Myth 2 The second myth surrounds the concern that fusing provides stronger joints. According to Ley, recent data and studies may prove otherwise.

“Fused joints are susceptible to a number of variables such as the skill of the technician, surface contamination, and hot or cold conditions – all impact the overall integrity of the joint. Further, there are currently no visual

Myth 3 Third, many believe that grooving pipe ends creates a point of weakness; however, Victaulic solutions have been designed specifically to allow the coupling keys to engage the groove profile, therefore providing a fully restrained joint up to the working pressure of the pipe.

Victaulic’s grooving tools, and training on their operation, ensure that the grooves are tightly controlled within the design specifications.

Moreover, the joint is designed so that the groove is filled with the keys on the coupling’s metal housing. Essentially, the reduced pipewall thickness at the groove is reinforced by a restrained ring of iron – a much stronger material than HDPE to begin with. This design adds to the strength of the joint, rather than detracts from it.

Myth 4 “Another myth is that the method of fusing remains a faster alternative to joining; and although many may believe this, the reality is

that fusing HDPE is a slow process, even in ideal conditions,” says Ley. Variables ranging from weather conditions to the skill of installers and the quality of their machinery impact the success of the joint.

Victaulic couplings ensure an installation time 10 times faster than fusing, using only simple hand tools. The installation of the joint is not determined by weather conditions, and offers the ideal solution to joints in tighter spaces.

Myth 5 Finally, many believe that mechanical coupling solutions are expensive alternatives. As mechanical couplings are faster and easier to install, and require little maintenance, projects are able to save on labour and skilled installation costs, which will ultimately negate the cost of the couplings, explains Ley. “As a global innovator in mechanical pipe joining solutions, Victaulic continues to transform various industries with the most advanced engineering technologies and services that allow customers to tackle even the most unique construction challenges.”

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Human Settlements

Housing as urbanism The legacy of apartheid has left South African cities sprawled and racially segregated. But this current urban form is socially, environmentally, politically and financially unsustainable. The concept of ‘housing as urbanism’ can help to address this going forward. By Brendon van Niekerk*

T

he concept of ‘housing as urbanism’ considers the social, political and economic components of housing. This, in reality, translates to housing that is closer to employment, municipal services, public spaces, healthcare, schooling and social services, while also providing the household with the physical infrastructure necessary for good quality of life.

However, these considerations have not been included in the mass roll-out of lowincome housing programmes in South Africa.

This monofunctional urban sprawl has led to a very inefficient urban form.

A series of case studies show that, in South Africa, a more compact urban form is not necessarily less expensive than a sprawled urban form. However, over the long term, the overall cost of housing developments that are better located, subscribing broadly to the principles of ‘housing as urbanism’, is likely to be less expensive to both municipalities and residents.

Housing policy To date, planning laws in South Africa seem to have had little impact on the reversal of the spatial structure of the ‘apartheid city’. The state-led Reconstruction and Development Programme (RDP), which offered free housing to the poor, led to further monofunctional land use and urban

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sprawl, and the concentration of the urban poor on peripheral, poorly serviced land.

More recently, however, there has been a significant shift towards sustainable urban integration and densification in the latest government policy – the Integrated Urban Development Framework. The logic for a move towards densification and compaction appears to be informed by social, environmental and redistributive economic arguments, and should work to improve the urban poor’s access to the ‘urban advantage’.

The challenges of South African cities Although South African cities have made significant progress in the provision of ser vices over the past 20 years, the general consensus is that South African cities are spatially fragmented, unequal and sprawled.

The morphology of South African cities has been called one of the most visible and enduring physical legacies of the apartheid era. These cities are characterised by a fractured spatial make-up, poor-quality public transport systems and peripheral lowincome settlements made up of generally substandard and inappropriate housing.

South African cities have also been called exclusionary based on the peripheral location of many poor urban residents.

Settlements of the urban poor are generally located far from economic opportunities, leading to pockets of wealth and poverty, ultimately reinforcing inequality and further burdening poor households.

The constraint of mobility is still in place in the form of distance to employment opportunities, price of transport, lack of adequate and well-maintained transpor t infrastructure, and the perceived lack of safety of the available transport options.

More than 50% of South African urban households spend more than 20% of their monthly household income on transportrelated costs.

Case study: Pretoria In 2000, a study in the metropolitan area of greater Pretoria (now Tshwane) investigated whether the government’s promotion of densification and compaction would decrease the capital cost of providing water, sanitation and electricity due to economies of scale.

The study applied a ‘bulk infrastructure potential cost model’, which found that the capital costs of providing bulk infrastructure per capita does not simply decrease in areas that are denser and/or centrally located.

In the case of Tshwane, it was concluded that there is no linear relationship between density, distance to city centre, and capital

Contractor HumanDevelopment Settlements

R6.8 billion per annum over 10 years.

Households of all incomes would pay less in the compact scenario.

The report states that if the findings are extrapolated to the six largest cities in South Africa, the difference between the two scenarios would be around 1.4% of GDP by year 10, increasing with time. costs of infrastructure. Total capital costs increased with increasing density for all services but for water and sanitation, they decreased on a per capita basis up until a point, after which they begin to increase.

Topographical factors increase the costs of water and sanitation infrastructure provision drastically. Electricity capital costs increase on a per capita basis for increasing density.

It was thus concluded that the sitespecific factors make the transference of any finding from this or any other study regarding the capital costs for water, sanitation and electricity for differing density development inappropriate.

Case study: hypothetical cities In 2011, the Financial and Fiscal Commission of South Africa commissioned PDG to determine whether sprawl in South

African cities leads to a less-efficient city, looking at the capital and operating costs of transport, municipal infrastructure, land and housing over a 10-year period.

A ‘city efficiency costing model’ was applied to two hypothetical cities: a sprawled city and a compact city, both based on the similar characteristics that South African cities share as a result of apartheid planning policies and housing subsidy structures.

The study considered the costs of new infrastructure and the renewal of existing infrastructure, and the operating costs of municipal services. It concluded that, over a 10-year period, a sprawled city is more expensive than a compact city.

The capital costs for the sprawled scenario were found to be 2.1% more expensive, while the operating costs of the compact city were 7% lower, amounting to approximately

Case study: eThekwini and Johannesburg An empirical investigation was carried out in 2004, in eight areas in eThekwini and Johannesburg, to assess the actual costs and benefits of the location of housing in the lives of urban residents.

It was found that the cost of land varied between centrally located and peripherally located areas, as well as within these areas themselves. The cost of providing bulk infrastructure to new settlements also varied according to the excess capacity in the system and the need for further upgrades.

Sites located further from the CBD incur higher transport costs. However, in some areas, the proximity to middle- and upper-income residential areas was more important, due to employment of informal,

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Human Settlements

FIGURE 1 Greenville and Heideveld case study locations

unskilled labour in these areas. The size of the entire metropolitan area, rather than location within it, as well as modal choice, is also an important factor.

The findings that emerged do not support the hypothesis that more central locations have lower overall costs and offer higher benefits. A more nuanced perspective on location, rather than the dichotic ‘central’ and ‘peripheral’, is necessary.

Case study: Western Cape In 2013, a fiscal impact study was conducted on the financial sustainability of current growth patterns in cities of the Western Cape.

A ‘municipal services financial model’ was used to calculate the municipal financial sustainability of seven municipalities based on different urban growth patterns over a 10-year period.

The findings showed a 17% decrease in capital expenditure and a 20% reduction in operating expenditure over 10 years in the more compact scenario. The negative financial impact of sprawl was also more significant in larger towns, again reinforcing the notion that overall urban size does matter.

The study also found that low-income households in many of the municipalities were unable to afford transport, and were therefore ‘trapped’ where they live. For example, the spatial growth patterns would result in low-income households in Cape Town spending approximately 18% more on transport than in a more compact scenario.

Case study: Cape Town Another study investigated whether the higher capital cost of low-income housing in well-located areas in Cape Town would

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be less than the cost of providing transport services to an equivalent site in a peripherally located area over a 20-year period.

Two subsidised housing developments, Greenville and Heideveld (see Figure 1), were selected. Greenville is a large, outlying development with low levels of accessibility to the CBD and low land values. Heideveld is a medium-sized development with a moderate level of accessibility and moderate land values.

The study showed that transport was the main cost differential between the sites.

The net present value (NPV) of the capital costs of the more centrally located site is R12 million higher than the peripheral site; however, this is more than offset by the NPV of the operating costs, which are R37 million cheaper for the centrally located site.

This difference in the operating costs is predominately due to the difference in transport expenditure.

A new policy direction?

South Africa’s cities are sprawling, despite government’s current attempts at controlling it.

Regrettably, low-income housing that conforms to principles of urbanism has largely been seen as unnecessary and not worth the additional bureaucratic processes and capital outlay to develop. The fiscal framework and Housing Code have also, until recently, dis-incentivised municipalities to construct urbanist housing.

Unfor tunately, the factors that influence the sprawled versus compact

city debate are too numerous and complex for conclusive findings to be made generically. In order to make decisions that can impact less negatively on both the municipal fiscus and the expenditure of the inhabitants, municipalities should include an analysis into the long-term financial impact of a development in the planning approval process. The factors which need to be considered include infrastructure thresholds, capacities, location, land-use mix, and density variations over time and space.

When social or low-income housing is being considered, the long-term costs to the inhabitant should be an important consideration to the municipality, including economic, social, environment and political factors.

A targeted approach to densification and transit-oriented development can achieve the objectives of ‘housing as urbanism’ and, consequently, a more efficient city. A more nuanced understanding of the true fiscal and financial costs of developments that accrue due to their location in space can lead to better decision-making.

It is clear that decisions that consider the principles of ‘housing as urbanism’ can assist in the creation of a more efficient urban form, freeing up resources for both urban residents and public sector organisations alike. *Brendon van Niekerk is a consultant at PDG. Contact the author at brendon@pdg.co.za.

Waste Management

Old landfills – a resource tank waiting to be unlocked?

The future management of old landfills can offer sustainability and economic benefits, or it can be a huge liability. By Neeraj Mannie*

O

ver its life, a landfill receives a plethora of disposed-of products and materials.

With the current focus on sustainable business practices and creating circular economies due to the over-use and depletion of virgin materials, manufacturers are forced to reconsider the use of such materials or how can they recover them from landfills as a source of new supply.

A viable alternative To meet sustainability initiatives, consideration needs to be given to the viability of material recovery from old landfills and the management of the remnants of these landfills, noting environmental and social management.

As we are all aware, there is a global drive to reduce methane emissions from landfills, local pollution and impacts on communities.

If we were to look at remediating landfills, the costs are likely to be significant and could be prohibitive to executing remediation.

However, if stakeholders considered the recovery and recycling of viable products (provided there is a sizeable market), then the cost of remediation will be a lot lower and the net effect of impact will be reduced.

Challenges There are, however, challenges to resource recovery from landfills. The contamination of recyclable materials poses a major risk, as not all materials can be effectively recovered.

The costs of decontamination could also be much greater, making it economically unviable. Meeting standards for product quality assurance will be challenging.

The size and type of landfill operation, along with the waste characterisation or accurate records of waste streams deposited in the landfill, are needed. Knowledge of the volume of soil cover placed in each lift will also give an indicator of the time and cost required to remove the soil. For industrial landfills, a good record of the amount of hazardous waste disposed of at the landfill is important, as a leaching toxicity test needs to be undertaken.

Furthermore, plans for where the excess waste will be stored, the types of machinery to be used to excavate the waste and the on-site separation or recovery process, odour and health and safety considerations, and the capital investment are key determinants in the feasibility assessment.

Other notable concerns are the potential social and environmental impacts that the

recovery process could create in the area in which it is undertaken. Risks need to be accounted for and the associated costs factored into the assessment of the project.

Overcoming the challenges To overcome some of these challenges, a critical assessment of all the challenges needs to be done, and extensive planning with the various teams is needed. To ensure economic success, having secured the market for the materials is going to be the project driver as will agreeing on the quality at which the recovered materials will be delivered.

The advent of the Fourth Industrial Revolution can provide the technology to undertake material recovery from landfills, digitising the entire resource process to effectively manage the project. Waste-toenergy projects could also benefit from material recovery, as there are sources of materials with high calorific value.

Through proper due diligence, a reasonable decision can be made to determine whether an old landfill offers the economic potential one is looking for. *Neeraj ‘Nick’ Mannie is a specialist advisor at Mannie Inc. – mwmannie@mweb.co.za.

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BIENNIAL PROJECT EXCELLENCE AWARDS

TUESDAY 27TH OCTOBER 2020 CAPE TOWN

CALL FOR ENTRIES To recognise outstanding achievements in municipal infrastructure, we are calling for entries

Planning and design Construction methods Innovation and originality

that showcase projects that demonstrate the best of civil engineering as a science and how engineering

Meeting social and technical challenges

enhances the lives of the local communities, through excellence in:

Contributing to the well-being of communities

CATEGORIES

1

ENGINEERING EXCELLENCE IN STRUCTURES & CIVILS E.g. Projects demonstrating engineering science, use of alternate materials, innovative construction processes, etc.

2

COMMUNITY UPLIFTMENT & JOB CREATION E.g. Projects demonstrating labour-intensive construction, skills development, community awareness/participation, etc.

3

ENVIRONMENT & CLIMATE CHANGE E.g. Environmental rehabilitation, renewable energy, drought solutions, coastal initiatives for rising sea levels, pollution control, educational/ technical initiatives, etc.

CLOSING DATE FOR SUBMISSIONS 13 JULY 2020

Only projects that have reached practical or substantive completion by 30 June 2020 will be accepted for the Excellence Awards.

Adjudicators reserve the right to reallocate entries in the 3 categories.

ENTRY FORMS AND AWARD CRITERIA Available for download on the website: www.imesa.org.za

IMESA THE INSTITUTE OF MUNICIPAL ENGINEERING OF SOUTHERNÂ AFRICA (IMESA)

QUESTIONS Contact Debbie Anderson on +27 (0)31 266 3263 or email conference@imesa.org.za

Waste Management

T

he disposal of liquid waste in landfills, as well as hazardous waste exceeding a calorific value of 20 MJ/kg, is now banned – effective 23 August 2019 – forcing a change in the way industry manages these waste streams.

Section 5 (1) (a–u), as well as Section 5 (2) (a–c), of the National Norms and Standards for the Disposal of Waste to Landfill (GN R 636 of 23 August 2013) provides for a non-exhaustive list of waste types that are prohibited from disposal to landfill in South Africa. These include reactive wastes, recyclable waste oils, whole waste tyres, lamps and lead acid batteries.

Kate Stubbs, director: business development and marketing, Interwaste

Landfill ban presents opportunities “While many businesses may not yet have prepared for this new legislative framework, there are already available solutions that are targeted towards complying with this new legislation,” explains Kate Stubbs, director: business development and marketing, Interwaste.

Interwaste has developed significant capacity over the years for the treatment, recycling and/ or recovery of qualifying wastes at its licensed waste management facilities. Examples include the recycling of qualifying liquid and hazardous sludge wastes (with CV >20 MJ/kg)

via Interwaste’s blending facility in Germiston, Gauteng. The end product is a waste-derived fuel intended for industrial applications.

“As government aims towards a circular economy and improving our environmental standards as a country, there will no doubt be further stringent legislation down the line,” Stubbs continues.

“As such, it is up to us as waste companies to take a proactive approach by seeking relevant investment and technology development opportunities for alternative waste disposal solutions,” Stubbs concludes.

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Cement & Concrete

Floors that don’t crack

S

hortly after the construction of a new industrial building, severe settlement cracking was observed in its concrete floors, demanding urgent attention. The client, Graham Beck Wine Estate, had specified a flooring system designed to withstand low to heavy traffic. The flooring surface also needed to have an attractive and clean finish. In the end, this was achieved following intensive remedial works.

As a starting point, Sika recommended the application of Sikadur-52 ZA – a two-

part, low-viscosity, injection-liquid based on high-strength epoxy resins. This product was used to fill and seal the cracks in the concrete floors. Following advice from Sika’s technical specialists, a waiting period of three to four weeks followed to ensure the complete sealing

A section of the repaired foor

of the existing cracks, and to check that no further cracking had occurred.

After first priming the concrete floor substrate with Sikafloor-161 – a two-part, low-viscosity epoxy resin – Epoxy Flooring Systems applied the PurCem floor coatings.

The one specified for the low to medium traffic areas was Sikafloor-21N PurCem. This is a multicomponent, medium- to high-strength, coloured, polyurethane-modified cement and aggregate screed with self-smoothing properties. It was selected for a smooth, flat and decorative wearing surface. A 4 mm layer was applied on the low to medium traffic areas.

For the medium to high loading and high traffic areas requiring a more durable floor coating, Sikafloor-20N PurCem was used.

This product, applied at 6 mm thickness on the wet floor areas, has a textured aggregate surface, providing medium- to heavy-profile slip resistance.

At the final stage, Sikaflex Pro-3 i-Cure – an elastic joint sealant – was used to seal all the connection joints where the Sikafloor-20N PurCem and Sikafloor-21N PurCem flooring systems had been applied.

A solid foundation for growth

A

n iconic brand within the South African market, AfriSam continues to make a major contribution to the evolving infrastructure landscape, with a legacy that dates back 85 years.

Landmark projects include: the Carlton Centre in Johannesburg’s CBD; the Nelson Mandela Bridge, linking Braamfontein and Newtown; the Lesotho Highlands Water Project Phase I; numerous new developments in Sandton, including The Leonardo, now believed to be the tallest building in Africa; and the Zeitz MOCAA museum and hotel within Cape Town’s V&A Waterfront.

Although the company has undergone changes in shareholding and names over its 85-year existence, AfriSam has remained true to its formula as a leading construction materials producer, according to Rob Wessels, acting CEO, and Richard Tomes, sales and marketing executive. This, they concur, has been pivotal to AfriSam’s success, despite the recent challenging economic cycles

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IMIESA October 2019

experienced by the construction industry.

Wessels says AfriSam has had to “right-size the business” and adapt where necessary to remain competitive, as well as continue to be the supplier of choice. “Business performance in tough times comes through shifting and broadening our customer base, and by continuing to focus on the quality of our product, technical advice and the relationships we have with our customers,” he says.

“AfriSam has a reputation for providing quality product and expertise, and getting things right – and we’re determined to maintain this,” he continues.

Among the initiatives AfriSam undertakes to promote quality within the industry is its anchor sponsorship of the Concrete Society of Southern Africa’s Fulton Awards. This, Tomes says, is in line with the company’s mission of “creating concrete possibilities by pushing the boundaries of concrete products, both in terms of sustainability and technical performance.”

The Zeitz MOCAA museum and hotel under construction within Cape Town’s V&A Waterfront

AfriSam is also the co-founder of the AfriSamSAIA Award for Sustainable Architecture + Innovation, which recognises the importance of green buildings and acknowledges the contributions made by forward-thinking industry players towards bringing sustainable innovation to human habitats.

Cement & Concrete

Simplifying large tile adhesion

F

alling into the C2F class, Mapei’s Adesilex P4 is a rapidsetting, semi-fluid, full-contact adhesive. It offers the added benefit of 100% tile coverage, eliminating the need for back-buttering on large-format tiles. This results in cost savings in both time and consumption per square metre (subject to required thickness). The product is easily trowelable and allows for light traffic within four hours.

As a smoothing compound, it can be used on interior and exterior surfaces up to a maximum thickness of 20 mm. Providing the substrate is clean with no loose debris, it can absorb deflections on the substrate and provides easy levelling and localised smoothing. The product can even be used as a mortar for brick and concrete block walls, wherever quick curing and high strengths are required “It’s important to remember that if the product is used as both a smoothing

ABOVE Adesilex P4 eliminates the need to back-butter large-format tiles RIGHT The product is easily trowelable and allows for light traffic within four hours

compound and a tile adhesive, the smoothing layer needs to be hardened and prepared correctly before proceeding with the tile application,” says Zamaswazi Ntobela, product manager: Ceramics, Mapei South Africa.

Adesilex P4 is suitable in heavy traffic zones such as offices, shopping malls, hospitals and schools. Its wide temperature range means it can just as easily be used over underfloor heating installations or any other application where temperature extremes may occur.

INDEX TO ADVERTISERS

Afrimat Shared Services IFC Afrisam South Africa

9

Ammann 39

Grundfos

68

Quality Filtration Systems

Herrenknecht

46

Rainbow Reservoirs

IMESA

36, 76, 80

ARRB Systems

18

JG Afrika

Aveng (Nafasi Water)

49

Kemach JCB 77

Averda

65

KSB Pumps & Valves 64

Bakwena Platinum Corridor

27

Lanxess

Chaithoo

14

Lektratek Water Technology 48

Colas

30

Mariswe 37

ELB Equipment 61 Entsika Consulting

OFC

Martin & East

35

38 2 29

Sabita

OBC, 24

Shisalanga

41

Sika

Sizabantu Piping Systems IBC

40

57

Mather+Platt 66

South African Road Federation

LI, 20

Southern Pipeline Contractors 4 Structa

58

Umgeni Water

54

Gabion Baskets 43

Much Asphalt

10

Utility Systems 70

GeoGroup 45

NOSA

52

Veolia Water Technologies South Africa 50

IMIESA October 2019

79

I M E S A A F F I L I AT E M E M B E R S

IMESA

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