August 30, 2024
New modelling reveals that low-carbon concrete developed at RMIT University can recycle double the amount of coal ash compared to current standards, halve the amount of cement required and perform exceptionally well over time. In 2022, more than 1.2 billion tonnes of coal ash were produced by coal-fired power plants. In Australia, it accounts for nearly a fifth of all waste and will remain abundant for decades to come, even as we shift to renewables. Meanwhile, cement production accounts for 8% of global carbon emissions, and demand for concrete—which uses cement as a key ingredient—is growing rapidly. Addressing both challenges head-on, engineers at RMIT have partnered with AGL's Loy Yang Power Station and the Ash Development Association of Australia to substitute 80% of the cement in concrete with coal fly ash. RMIT project lead Dr Chamila Gunasekara said this represents a significant advance as existing low-carbon concretes typically have at most 40% of their cement replaced with fly ash. "Our addition of nano additives to modify the concrete’s chemistry allows more fly ash to be added without compromising…

















