Green Concrete-Industry Popularity Product
June 12, 2024
Green Concrete
There is a lot of coal ash around coal-fired power stations. In fact, that may be an understatement - globally, power stations generate around 1.2 billion tonnes of coal ash per year, and in Australia, coal ash accounts for nearly 20 per cent of all waste. That's a staggering figure, and it's a safe bet that coal ash will remain plentiful long into the renewable energy transition.
As such, it represents a huge potential resource of material and has been used by low carbon concrete manufacturers as a cement replacement, often replacing up to 40 per cent of cement. Environmentally, this is a double win, utilising a large amount of waste material and reducing the amount of cement used, which itself accounts for around 8 per cent of global carbon emissions.
A team from RMIT University has been working with the Australian Coal Ash Development Association and AGL Luoyang Power Station to make better use of this suspect asset and to try to increase the coal ash content to replace more than 80 per cent of the cement.
To do this, the researchers used a low-calcium fly ash mixture, 18 per cent slaked lime and 3 per cent nano-silica as a reinforcing agent, then poured some concrete and began testing its mechanical properties.
The compressive strength of the high volume fly ash (HFVA-80) concrete increased from 22 MPa to 71 MPa between day 7 and day 450. Its flexural strength was 2.7-8.7 MPa, split tensile strength was 1.6-5.0 MPa, and modulus of elasticity was 28.9-37.0 GPa. After two years of exposure to acid and sulphate environments, its durability exceeded that of ordinary silicate cement.
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