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Sydney road trials world-first green concrete

Vivien Lin
A world-first green roads trial in Sydney is testing the durability of environmentally-friendly concrete made from industrial waste. 

The project, funded by the CRC for Low Carbon Living (CRCLCL) and the City of Sydney, has replaced a 30-metre section of roadway on Alexandria’s Wyndham Street with Geopolymer concrete, a sustainable blend of concrete and recycled materials from coal-fired power stations and steel manufacturing. Sensors have been placed under the concrete to observe and compare the performance of the Geopolymer concrete.

Wyndham Street, a major road leading to Sydney Airport, has been chosen for the trial as its high volume of traffic provides the perfect conditions to test the material’s durability. 

Geopolymer generates just 300 kilograms of carbon dioxide per tonne of cement, one third of the usual 900 kilograms generated by traditional cement production. 

“Concrete contributes seven per cent of all greenhouse gas emissions and in 2018 the world produced about 4.1 billion tonnes of cement, which contributed about 3.5 billion tonnes of CO2,” says Professor Stephen Foster, Head of University of New South Wales (UNSW) School of Civil and Environmental Engineering and the CRCLCL project lead. 

Although research into Geopolymer has been undertaken since the 1990s, it has only recently been acknowledged as a product that is simultaneously better for the environment and commercially viable. 

According to Dr Tommy Wiedmann, Associate Professor of Sustainability Research at UNSW, if all concrete produced annually was Geopolymer instead of traditional concrete, this would save 12,000 kilotons of CO2 per year. 

Using Geopolymer concrete will allow the 400 million cubic tonnes of globally documented waste from coal and steel industries to be put to good use. 

“Projects like this Geopolymer trial can result in new products that make a real difference in slashing carbon emissions,” says Lord Mayor Clover Moore. “With 70 per cent of the concrete produced today going into pavements and footpaths, there is great potential to further lower emissions from our operations.”

The road’s performance will be monitored for up to five years. Researchers from the University of NSW and the CRCLCL will then use the results of the trial to develop the first set of industry guidelines for Geopolymer concrete.

“This trial will help drive step change in the industry,” says Professor Foster. “This trial is important because we need demonstration projects to accurately assess the performance of Geopolymer over time so that there can be broader uptake.” 

You can watch a time-lapse video of the process here

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