Experimental Study of Mechanical Properties of Concrete with Stone Dust and Phosphogypsum

Abstract: Stone dust a waste from the stone crushing unit accounts 25% of the final product from stone crushing unit. This Stone dust which is released directly into environment can cause environmental pollution. To reduce the impact of the Stone dust on environment and human, this waste can be used to produce new products or can be used as admixture in concrete so that the natural resources are used efficiently and hence environmental waste can be reduced. Here Stone dust is used for partial replacement of fine aggregate in concrete and gypsum is used for partial replacement of cement for studying the strength property of concrete. The aim of the experiment is to find the maximum content of stone dust partial replacement of fine aggregate and phosphogypsum partial replacement of cement in concrete. The percentages of stone dust partial replacement of fine aggregate in concrete are 10, 20%,30%,40% and 50% and phosphogypsum replacement of cement 5,% 10%, 15 %, 20%, and 25 % In M35, grade concrete cubes of 150x150x150mm size and cylinders of 150x300mm and beams 50x10x10cm were cast for conducting compressive strength, split tensile and flexural test.

Keywords: stone dust, phosphogypsum, compressive strength, split tensile strength, flexural strength.