Utilisation of Sewage Sludge as a Partial Replacement of Cement to Increase the Strength of Concrete

Abstract

The sewage sludge from waste water treatment plant is increasing all over the world. Disposal of this sewage sludge is becoming a severe environmental issue to our society. Due to this fast urbanization, the demand of cement has increased. It will lead to increased cement production and emission of carbon dioxide because the cement industry one of the major contributor of carbon dioxide emission. Therefore, the research for replacement of cement using sewage sludge ash is very important to reduce both the emissions of carbon dioxide and the disposal problem of sewage sludge ash. Five different percentages of sludge used to partial replace the cement in the concrete. The partial replacement of cement in concrete with sludge has shown lower water absorption and increase compressive strength of concrete. The replacement of cement in concrete with 5% SSA have lower water absorption, and then increase in compressive strength of concrete up to 10% as compared with the control samples.