Highway authorities approve new waterproofing system

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Highway authorities approve new waterproofing system

A new bridge deck waterproofing system from Switzerland has been officially approved by the highway authorities’ product certification scheme

Following a successful trial project on Belton Lane bridge in Grantham, BBA-HAPAS (Highway Authorities’ Product Approval Scheme) has approved Sika’s Sikalastic fast-curing deck system for certification. A BBA inspector was on site all the time to evaluate the work and the performance.

Sikalastic fast-curing deck system offers a low odour application and a fast turnaround, Sika says. Its crack-bridging properties and flexibility, even at low temperatures, give it good resistance to abrasion and wear in the most challenging and aggressive environments, the manufacturer adds.

“We are delighted that the Sikalastic fast-curing deck system received BBA-HAPAS approval,” said Sika general manager Ivo Schaedler at Sika. “Our inclusion on the approved list not only demonstrates our continued commitment to product development, it reinforces our credentials as a global leading supplier of the highest quality building products and systems.”

Set up in 1995, BBA-HAPAS is the nationally recognised approval scheme for products, materials and systems used in highways and related areas.


The trial

Belton Lane Bridge, located in Grantham UK, crossing Whitham River, had an old bituminous sheet waterproofing layer overlaid with an old worn asphalt concrete as base and wearing course. Due to the bad conditions ingress of water started to attack the concrete of the walk ways and the road. The total surface to be refurbished was 220m².

Lincolnshire County Council decided to take away the whole existing system, including the bituminous sheets, level out the slightly attacked concrete surface and install a crack bridging, fast curing, spray applied waterproofing membrane, covered with an asphalt concrete overlay and wearing course, tested and certified according the BBA -HAPA S standard.

Main contractor was May Gurney (Kier) and the specialist applicator was APA Concrete Repairs Ltd. The work was carried out in August 2013.

Sika offered the fast curing, already ETA 033 certified bridge deck waterproofing system. The system consists of the fast setting Sika concrete primer, the spray applied, fast curing Sikalastic-841 ST membrane and the tack coat to the asphalt overlay made of Sika Concrete Primer broadcast with Sikalastic-827 LT hot pelt pellets. This system is fully bonded to the concrete substrate and the asphalt overlay, and it provides good adhesion and shear strength, Sika says.




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