An experimental study on mechanical properties of concrete using sludge ash

Abstract

The aim of this project is to give a simple method of using the sludge ash in partial replacement with cement. The disposal of sewage sludge affects the environment as it may contain harmful pathogens, heavy metals and excess phosphorous and nitrogen. The sludge produced from waste water treatment plant is incinerated. The sludge ash retained is partly replaced with cement in concrete at different proportions (5%, 10%, and 13%) and the behaviour of the concrete is studied. The casted specimens are tested for 7 days and 28 days of curing strength as per Bureau of Indian Standards (BIS) specification codes. Mechanical properties such as compressive strength, tensile strength and flexural strength of the sludge concrete are determined. The strength obtained from the above process is compared with the nominal concrete and the difference in the strength, flexure and tension is studied.