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ISSUE

Number 9 Extra 2009

newsletter specialist manufacturer of preventative and remedial below grade waterproofing products

De Neef introduces versatile self-adhesive Swellseal 108 Recently introduced into the market is the new Swellseal 108 hydrophilic rubber strip. Complementing our existing range of water swelling rubber strips in the Swellseal range, Swellseal 108 has already proven to have several advantages in the applications. Swellseal strips are mainly used between precast elements where its need to use an adhesive to glue the strip to the surface brings extra costs in labour, time and consumptions. Swellseal 108 is a self adhesive strip with excellent adhesion to dry or slightly moist concrete or steel surfaces. Easy to fix using this self adhesive layer, Swellseal 108 can still be additionally fixed using nails. Most hydrophilic waterbars experience slight to severe reduction in expansion rate when immersed into salt or brackish water, reducing their applicability in marine constructions or seaside buildings where contact with seawater or brackish water is possible. With expansions rates of 4V in fresh water and 3.5V in saline waters, Swellseal 108 is the optimum solution for structural waterproofing in coastal areas. Swellseal 108 is supplied as 1,15 m strips in trays packed in a cardboard box. Of special interest is the end connection detail between strips which is pre-shaped to allow easy but end connections.

Swellseal Plug for sealing formwork spacers Insitu cast concrete is generally cast between 2 rows of formwork. To ensure that the concrete thickness is uniform and according to specifications, spacers are installed in the formwork. After the formwork is removed these spacers can be easy water ways since they are fibre cement or plastic tubes. While these are sealed on the outside using cement cones glued in place with epoxy adhesives or simply sealed using repair mortars, these spacers cause a lot of headaches for waterproofing the surface. On large surfaces a lot of spacers are present which, when leaking, are difficult and expensive to seal using resin injections. To counter this problem, De Neef introduces Swellseal Plugs. Swellseal Plugs are conical shaped plugs suitable for spacers with

a diameter up to 20 mm. Easy to install by simply inserting and driving down using a blunt wooden dowel, the Swellseal Plug will immediately seal the spacer opening and swell to resist counter pressure when in contact with water. The remaining hole in the concrete wall can then be repaired using whichever method is specified. Swellseal Plugs are packed in blisters in cardboard boxes for easy site manipulation.

Dear reader,

Since I have founded De Neef Conchem, I have always put great emphasis on being an innovator. In this Newsletter you will read about the introduction of the Swellseal 108, which is a PU based hydrophilic strip with self adhesive properties that also swells well in salt water. This is a real innovation and perfectly in line with our motto: De Neef Conchem: The Innovator. Based on the technology we have also developed a sealing plug for formwork spacers. I hope you will all appreciate these 2 new products. Best Regards, Herman De Neef President


De Neef introduces new pumps for tunnel and underground applications In many cases, the resin of choice will be a 2-component system from the Rockstab, Organosol, Elastopack or Deneblock ranges and for the successful application of these resins, De Neef introduces a range of pumps and accessories which can be supplied together with the injection material for speedy solutions to your problems. Centred around two new 2-component pumps with high flow rate/pressure performance curves, the new range comprises: IP 2C-Highflow is a pneumatic driven, skid mounted 1/1 fixed ratio pump suitable for all De Neef 2-component resins. With a flow rate of 16 l/min and a maximum pressure of 240 bars, this pump can manage all types of injections found in tunnelling and underground constructions.

IP 2C- Variflow is a pneumatic driven, all stainless steel variable ratio pump with loggers and separate flush pump, this pump is highly suitable for the very fast systems where flushing of the mixing head is required to save time and mixing units. Delivering 16 l/min with a maximum pressure of 160 bars, this pump is suitable for all water blocking and water control applications using Elastopack MJ and Deneblock UF. Both pumps can be equipped with a range of mixing units to adapt to the specific applications conditions.

De Neef also introduces a high performance 1-component pump for applications in tunnels and other underground constructions where large flow rates and pressures are required. IP 1C-HiPo is a high performance single component pneumatic piston pump. Capable of pumping all our 1-component injection resins with a maximum flow rate of 24 l/min and pressures up to 310 bars, the IP 1C-HiPo is the pump of choice for applications where long injection hose lengths or counter

pressures are required. Added to the pumps, a large range of packers and accessories are now available by request to make up a package that can suite all you possible applications.


A 1000 m2 potable water tank renovation in Masnou (Spain) In June 2009, applicator Bersa was asked to renovate, waterproof and provide an anticarbonatation protection on a potable water tank which supplies potable water to Masnou city and the residential areas around it. The water company specified a durable high quality repair solution, taking into account carbonatation in the structure. The waterproofing product used had to be potable water approved.

The solution consists mainly of two products: waterproofing with Aquatek Elastic 2C and anticarbonatation protection with Omnitek Paint EC. Before the waterproofing and after the surface sandblasting, the surface was repaired. On the one hand, Omnitek XLS Fiber was applied for fillets and for pillars, as a levelling layer. Omnitek XLS Fiber is a repair mortar that can be applied up to 50 mm in thickness, it has waterproofing capacity and it is 100% compatible with De Neef’s waterproofing cementitious coatings.

On the other hand, some small cracks were detected in the tank wall, where Aquatek Elastic 2C will be applied. Cracks were filled with Aquatek Elastic Masilla, an elastic 2-component cementitious product for crack filling by trowel application. The applicator decided to use Aquatek Elastic Masilla as an alternative to Reinforcement Mesh, since cracks had different widths and shapes

and he was used to use Aquatek Elastic Masilla for this kind of repair. When both Omnitek XLS Fiber and Aquatek Elastic Masilla were cured, Aquatek Elastic 2C was applied in 2 layers with a roller, according to the TDS. Aquatek Elastic 2C is a 2-component cementitious coating for waterproofing, certified by Applus and WRAS as suitable for applications with potable water. When the waterproofing was finished, Omnitek Paint EC was applied to the external wall of the tank. Omnitek Paint EC is a 1-component elastomeric decorative anticarbonatation paint. The purpose is to protect the concrete structure from the CO2 action, which leads to carbonatation problems. The tank is close to a highway, and cars create CO2 as a result of the engine combustion; the heavy traffic justified the application of the anticarbonatation paint Omnitek Paint EC, in 2 layers. Some days later, when the application was finished, the tank was rinsed thoroughly with clean water. Clean water is used a minimum of 7 days after the

application of the Aquatek Elastic 2C, when the product is sufficiently cured. After that, the tank is suitable for potable water containing.

Aquatek Elastic 2C - Potable water approved - Permeable to water vapour - Slows carbonatation in the structure - Elastic waterproofing coating

Omnitek Paint EC - CO2 permeability certificate available. - Permeable to water vapour. - Good resistance to carbonation. - Freeze-thaw resistant. - Decorative finishing.


New Tyne Tunnel Crossing New Tyne Tunnel Crossing (Immersed Tube) in 2009 The existing Tyne Tunnel carries between 34,000 and 40,000 vehicles per day and is nearly 43 years old. The Tyne and Wear PTA were granted the go ahead to build a second tunnel underneath the river by the Government in 2005 linking the city between Jarrow and East Howden. The immersed tube tunnel will be constructed using 4No sections (90m x 8m x 15m). The sections will be built in the exact shape of the design in a dry dock next to the main excavation. The shape of the tunnel sections will be achieved by the placing of 78 tonnes of gravel to the same profile. To stabilise the area plywood was laid out and nailed to the ground to ensure the sections do not float off once they are released to float down river. Construction of the North and South Approaches The river section of the new vehicle tunnel will connect to the cut and cover sections of the tunnel, either side of the River Tyne, via dedicated transition structures that will be built on each river bank. Each transition structure consists of a shaft which is constructed with four diaphragm wall panels. The North Approach which includes the new toll plazas and the entrance to the new tunnel in East Howdon – will carry traffic heading south from the A19. It is

approx. 840m. The majority of the section involves cut and cover, a short section of the tunnel uses underground boring techniques. When bored, the sprayed concrete lining section comprises an outer sprayed primary lining and an inner cast in situ permanent lining. Also, an insitu reinforced concrete box is being built which will form the final southern end of the tunnel and will extend out to the south junction from underneath the newly constructed road bridge.

being constructed by Bachy Soletanche for Bouygues using a cut and cover technique. This will involve diaphragm walls being installed in the ground, to create a supported space within which the tunnel excavation can be made. The north cut and cover tunnel will link the exit road from the toll plaza to the riverside transition structure. It will be about 318m long. The south cut and cover section runs from the southern tunnel portal in Jarrow to the riverside transition structure on the southern bank of the Tyne which is a distance of

Solution: Bentorub® +, Bentorub® Salt, Omnitek RM Fiber, Re-Injecto, Bentostic The main concern for Bouygues was the waterproofing of the insitu day joints for the pours of the walls for the transition structure. De Neef were in competition with BBZ and Sika for the waterproofing element of these structures. Bouygues would be casting the walls in sections and therefore needed products that could be left exposed for a number of days prior to pouring due to the volume of steel that needed to be cased and wired prior to pour-

ing. Bouygues and De Neef decided on a belt and brace system of a waterstop and injectable hose. The design called for a levelling compound to be applied to the surface of the piled wall due to the roughness of the breakout tips. This was achieved by using Bentostic and then the Bentorub was applied on top of the Bentosteel. The Re-Injecto was installed as a loop system to allow each section of hose to be installed at a maximum of between 10-12 metres with connecting Twin boxes. The problem with this installation was allowing for injection points due to the carriageway design. Advantages • Belt and brace system from one manufacturer • Design assistance • Adaptable products • Post construction injection with one manufacturer

Colofon PUBLISHED BY De Neef Environmental & Chemical Group Industriepark 8 • 2220 Heist-op-den-Berg • Belgium Tel +32 15 24 93 60 • fax +32 15 24 80 72 • info@deneef.eu www.deneef.eu EDITORIAL STAFF Guy Colson • Dominique Smits • Edgar Landa Colacios • Alan Perry DESIGN Tom Verstappen


Newsletter 09