Sustainable cement products
Cement Australia is committed to providing sustainable cement alternatives for blending purposes where possible. A small number of processed by-products – for example, fly ash from power generation and slag from steel manufacturing – can substitute cement to some degree. These useful by-products are known as ‘supplementary cementitious materials’.
Properly prepared fly ash and blast furnace slag have properties that allow them to behave like cement in combination with ordinary Portland cement and water. Blast-furnace slag is a non-metallic by-product derived from the production of iron in a blast furnace. Fly ash, a by-product of black-coal fired power stations, also provides a quality cementitious material suitable for use in combination with cement.
By using these materials to reduce the clinker content of cement, the thermal energy requirements of a cement plant can be reduced. An even greater benefit is the significant reduction in carbon emissions – for every tonne of fly ash or blast-furnace slag used in cement, there is an equivalent reduction of about 770 kg of carbon dioxide.
Cement Australia recycles well over a million tonnes of fly ash and blast-furnace slag each year.
To read more about Fly ash, click here.
To read more about Slag, click here.