Construction World April 2015

CEMENT AND CONCRETE TECHNOLOGY

The pan mixer at the Concrete Centre of Excellence, which aims to raise the level of construction technology within the Murray & Roberts Group.

The cube tester at the Concrete Centre of Excellence.

The drying oven at the Concrete Centre of Excellence.

used in geopolymer technology at room temperature while absorbing carbon to form a protective membrane due to the surface tension chemistry reducing the shrinkage and causing a curing membrane which forms automatically. “The particular difference in the South African context is a re-engineered silicate blend and a chemical design methodology that reduces the activator require- ment from about 200 litres per m³ to 20 litres per m³, as used at the City Deep project, while reducing the normal shrinkage experienced with geopolymer technology from 1% to 0,025% and reducing the requirement for heating during curing,” Attwell concludes.

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The curing baths at the Concrete Centre of Excellence.

CONSTRUCTION WORLD APRIL 2015