Use of sewage sludge ash as a cement replacement in concrete: A review / Amminudin Ab Latif, Ainamardia Nazarudin and Noor Safwan Muhamad
2020
Rapid industrial development and population growth in countries around the world have increased the production of sewage sludge. Sewage sludge is a waste product of the sewage treatment plant processes. The sewage treatment plants produce a large volume of wastewater every day in order to control the quality of the effluent released into a river or the sea. Instead of disposing of the sewage sludge at landfills, using sewage sludge as a recycle material could minimize the need for a new disposal area and consequently reduce the negative impact on the environment. Many studies have been conducted to examine the use of sewage sludge ash as a recycle material. This paper reviews the use of sewage sludge ash as a cement replacement in concrete production. Sewage sludge ash is a powdered material that contains a high percentage of SiO2, Al2O3, Fe2O3, CaO, P2O5 and SO3, and shows moderate reactivity in terms of pozzolanicity. Most of the researchers burned the sewage sludge at a temperature range of between 600°C - 900°C to produce sewage sludge ash. The partial replacement of cement with sewage sludge ash promoted an increase in the compressive and flexural strength of concrete. Meanwhile, the replacement of 5% sewage sludge ash by weight of cement was considered to be an optimum content in obtaining the best mechanical performance of concrete. Furthermore, the workability of concrete after 28-days was improved with the addition of SSA.
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