Composities & Alternatives
Watertight Case For Revamped Shopping Centre
Currently undergoing a facelift and major expansion, is the redevelopment of Oxford’s Westgate Shopping Centre
Located in the heart of the historic city of Oxford, the existing shopping centre is being transformed by main contractor Laing O’Rourke, with the new expanded 14 acre development set to include more than 100 new stores, 25 restaurants and cafes, a new cinema and rooftop terrace, and a 1,000 space basement car park.
With the site located next to a river, engineers Waterman Group required a complete tanking system for the basement areas that could prevent lateral water movement.
In order to seal the basement car park slab and the reinforced concrete walls, the specification included more than 35,000 m² of the Sikaproof A08 and A12 system, a totally new concept in membrane barrier design to deliver outstanding levels of watertightness to the lower floors.
The membrane surface of the new product is embossed with a grid pattern, which contains a sealant, and is topped by a thin layer of fleece which forms a mechanical bond to the concrete when it dries.
The grid pattern is also unique. It offers additional protection, due to the integrated sealant, which bonds tightly with the surface of the concrete, forming mini watertight compartments.
Therefore, even if the membrane is damaged or pierced, moisture or pressured water cannot spread between the membrane and the concrete structure as it is contained within the small damaged grid square.
To complete the system, construction joints were sealed with the SikaSwell jointing system, which consists of joint sealing profiles that expand on contact with water to seal any voids between adjoining concrete slabs.
Designed by architects, Chapman Taylor, Construction is now taking place across the whole of the Westgate site.
To the southwest of the site, the construction of the two storey basement car park is continuing with the upper floor levels of the new John Lewis department store clearly visible.
The department store is one of the 5 individually designed buildings connected by a series of public spaces, arcades and pedestrian bridges which sit under elegant glass and steel roofs creating a naturally ventilated light and open space.
The Westgate Oxford shopping centre scheme is set for completion in the autumn of 2017.
New Rapid Road Repair Products
Hitex International, a leading global provider of road safety and surfacing solutions, has announced three new rapid road repair products.
TexPatch and TexBand Solo are new fill and over-band products designed to seal and repair potholes, cracks, seams and joints to prevent further road surface deterioration.
As well as being quick and easy to install, they can be trafficked in minutes to speed up the repair process, minimise disruption and reduce traffic management costs.
TexPatch provides a fast, permanent and economical solution to repair defects over 15 mm deep and up to 1 m² such as potholes. Suitable for all asphaltic surfaces, the thermoplastic material incorporates polymer modified bitumen compound and granite aggregate.
It is easy to apply using a screed box which ensures a strong thermal bond to substrates and makes it an ideal permanent solution for high stress and highly trafficked applications. The dry material is easier to handle than bituminous products, with no paper bags needing to be stripped and therefore less waste produced.
TexBand Solo rapidly repairs cracks, seams and joints up to 40 mm wide in all asphaltic road surfaces and is sufficiently durable for use on highly stressed surfaces such as bends and roundabouts. It incorporates grey granite aggregate with a polished stone value (PSV) of 62+ to improve safety by optimising initial and long term skid resistance.