The Asia Miner

JUL-SEP 2019

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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the asia miner • volume 16 • issue 3 23 WASTE TO ENERGY Concrete made using industrial waste from coal-fired power staঞons and steel manufacturing is being used in a world-first green roads trial in Sydney. The City of Sydney is puমng the environmentally friendly building product to the test on a busy inner-city street, replacing a 30-metre secঞon of roadway on Wyndham Street in Alexandria. To test the green concretes durability, the City laid 15 metres of tradiঞonal concrete and 15 metres of Geopolymer concrete, a sustainable blend of concrete and recycled materials. As a major road leading to Sydney Airport, the high traffic volume provides the perfect condiঞons for the trial. Nine sensors have been posiঞoned under the concrete to monitor and compare how the Geopolymer concrete performs. UNSW Sydney researchers and the CRC for Low Carbon Living (CRCLCL) will then use results from the trial to create the first set of industry guidelines for Geopolymer concrete. Lord Mayor Clover Moore said the City was commied to finding new ways to lower carbon emissions. "I'm proud that the City of Sydney was Australia's first carbon-neutral local government and that we're conঞnuing to take significant steps to reduce our carbon footprint," the Lord Mayor said. "Projects like this Geopolymer trial can result in new products that make a real difference in slashing carbon emissions. "Local governments are responsible for maintaining local roads, so if we can purchase more environmentally sustainable materials, we can fight climate change and provide quality infrastructure for our community. "With 70 percent of the concrete produced today going into pavements and footpaths, there's great potenঞal to further lower emissions from our operaঞons. "We're conঞnually working with concrete suppliers to reduce the amount of polluঞon and greenhouse gases emied during the producঞon of concrete for our local roads, and we already use sustainable green concrete for all our footway renewal works – which adds up to 25,000m 2 per year." Made from fly ash and blast furnace slag, Geopolymer generates just 300 kilograms of CO 2 per tonne of cement, compared to the 900 kilograms from tradiঞonal cement producঞon – saving the equivalent of the electricity used by an average household every two weeks. Research has been undertaken since the 90s into geopolymer, but it's only now that it is being explored as a product that is not only beer for the environment, but also commercially viable. The low CO 2 concrete has the potenঞal to put the 400 Sydney road drives world-first green concrete trial City of Sydney Council tests out revoluonary geopolymer concrete

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