Studies on Laboratory Investigation on Strength Properties of Concrete with Partial Replacement of Sand by GBFS

The present study focuses on the partial replacement of Sand by waste material or by-product from manufacturing processes. The ground granulated blast furnace slag (GBFS) is a waste product from iron manufacturing industry, which may be used as partial replacement of sand in concrete because it has little cementitious properties. In this experimental work the compressive strength, flexural strength tests were conducted by adding ground granulated blast furnace slag (GBFS) in various percentage was 0%, 25%, 50%, 75% and 100% to the weight of sand . From the test results it can be conclude that strength of the concrete increases with the increase of GBFS upto 50%. In this experimental work sixty cubes and sixty prism were casted and tested the maximum increased strength obtained up to 50% replacement of sand by GBFS compared to conventional concrete. The optimum replacement of GBFS is 75% which has marginal decrease in strength compared to 50%. But 75% replacement strength nearly matching with conventional concrete and 100% replacement has marginal decrease in strength compared to conventional concrete.