IN A WORLD FIRST, THE CITY OF SYDNEY IS TRIALLING THE USE OF GEOPOLYMER CONCRETE TO CONSTRUCT A 'GREEN' ROAD.

This environmentally friendly concrete is comprised of industrial waste from steel manufacturing and coal-fired power stations, specifically blast furnace slag and fly ash.

Working with researchers from the University of New South Wales, the City of Sydney recently replaced a section of roadway on Wyndham Street in Alexandria. As a major road leading to Sydney Airport, Wyndham Street’s high traffic volume provides the perfect conditions for the trial.

According to the City of Sydney, geopolymer generates just 300kg of CO2 per tonne of cement, compared to the 900kg in traditional cement production. The carbon emissions savings is equivalent to the electricity used by the average household every two weeks.

Industry partner Craig Heidrich (Executive Director, Australian (Iron and Steel) Slag Association and Ash Development Association of Australia), said the benefits of the trial will be far-reaching.

Image courtesy of the City of Sydney.