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FEATURE CONCRETE TECHNOLOGY & CONSTRUCTION EQUIPMENT

New composite material reinforcement whereas steel is only allowed 0.3mm. The low shear strength is already allowed for in the design considerations, noting that MATEENBAR may be used extensively in slabs and the shear of the slab is mainly carried by the concrete. Pultron has been operating since 1981 and due to significant growth has recently opened a state-of-the-art facility in the United Arab Emirates near Dubai and Abu-Dhabi to supply the Middle East with the composite reinforcing bar. Jasper Holdsworth, managing director, says that this region has significant growth potential, as the Middle East suffers from accelerated corrosion due to the high salt levels within the soil. Pultron has worked closely with industry leaders

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TEENBAR allowed designers to isolate short sections of reinforcement, thereby reducing eddy currents and reducing the effects of accelerated corrosion; and an aluminium smelter in the Middle East, where MATEENBAR was used to mitigate electrical induction problems caused by steel. Another example is the 109km Singapore MRT where MATEENBAR was used for ‘soft eyes’ within walls and ‘soft column’ sections in positions where the tunnel boring machine would be required to cut through during later stages of construction. Pultron and its US partner, Sigma Development Group, has recently been granted full approval by the US State Department of Idaho to use MateenDowels (a hybrid of MATEENBAR) as an alternative to epoxy coated steel reinforcement for State roads and highways. One of the issues faced by Pultron is educating engineers on how to use a new composite material reinforcement – this ranges from overcoming the bias towards steel and educating traditional engineers in the different methods in which to design with this material. Pete Renshaw, business development manager of Pultron says many traditional engineers used to steel see initial limitations and proceed no further – but he advises they can all be resolved, generally with relatively minor changes to design philosophy. He cites several common issues, ranging from slightly lower transverse shear strength than steel, lower modulus, and no yielding of the rebar before brittle failure. But they can be all overcome and this is reflected by the millions of feet of MATEENBAR that have been specified internationally by leading consulting firms for high profile projects. For example, even though MATEENBAR has a brittle failure mode, the system as a whole can be designed to exhibit the desirable ductile failure mode. Higher deflections due to the lower modulus than steel are offset by limiting effective spans or increasing sectional modulus – in addition concrete sections reinforced with FRP are allowed crack widths of 0.7mm,

the ultimate reinforcement

for concrete in challenging applications

mateen-bar™ is a high performance, corrosion resistant concrete reinforcing bar. It solves a variety of engineering problems associated with steel reinforcement. • • • • • • • • • •

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raditionally, the preferred reinforcement for concrete structures has been steel. However, steel has its limitations, making it unsuitable for certain environments and applications. In such conditions, design engineers have struggled to find a satisfactory material and often had to accept inadequate solutions. Pultron has spent over a decade developing a fibre reinforced plastic (‘FRP’) reinforcement branded, MATEENBAR. The properties of this alternative reinforcement include resistance to corrosion and chemicals, non-conductivity and non magnetic, low thermal conductivity, and easily cutable. In addition, MATEENBAR has a very high strength to weight ratio – tensile strength is in the order of 1000MPa – with density that is a quarter that of steel. The main utilisation of MATEENBAR is as a cost-effective and more durable alternative to epoxy coated and stainless steel reinforcement for marine structures and chemical plants; reinforcement for structures with high electrical fields such as aluminium smelters and electrical substations; temporary reinforcement for tunnels; reinforcement of bridge decks for which high fatigue endurance is needed; structures where a long life span is demanded and steel cannot deliver; and reinforcement of concrete structures close to magnetic, telecommunication, or radar equipment. To date, Pultron Composites has supplied over 50 major projects internationally with MATEENBAR reinforcement. These include a $400 million sewerage tunnel in Sydney designed by Connell Wagner to collect the stormwater overflows where stainless steel reinforcement would otherwise corrode; soil walls and highway barriers for multiple Middle eastern civil projects such as the Muscat Expressway and Dubai Marina where soil walls and highway barriers require reinforcement with high corrosion resistance; the US$2 billion East-link M3 tollroad in Melbourne, where the insulation properties of MA-

to gain a full understanding of the requirements and develop the perfect reinforcement for these harsh conditions. “MATEENBAR is twice as strong as steel, is one quarter the weight, and is corrosion free. By increasing the cost of a structure by only one per cent it will increase the lifespan by three times. In an extremely corrosive environment – such as a seawall or marine application where stainless steel has traditionally been the preferred option – MATEENBAR not only increases the lifespan – it also halves the cost of the reinforcement.”

Perfect for highly corrosive environments – corrosion free Non-conductive Non-magnetic ¼ the weight of steel – easier on-site handling and installation Cost effective vs. epoxy coated, mmfx and stainless steel rebar Durability unmatched by any steel product Widespread international use by leading civil consultants and construction firms Low carbon footprint Bends and specialist shapes available www.mateen-bar.com for specifications and further details

New Zealand +64-6-867-8582 sales@mateen-bar.com technical@mateen-bar.com

Middle East +971-4880-9533 sales@mateen-bar.com

USA /Canada Sigma Development Group +1-360-859-3170 mateen@sigmadg.com www.sigmadg.com

June 2010

28/5/10 8:04:30 AM


NZ Engineering News Publication