Experimental Study On Effect Of Blast Furnace Slag As A Partial Replacement Of Course Aggregate On Compressive Strength Of M20 And M30 Grade Concrete Mix

Abstract

Meeting the increasing demand for aggregates while reducing the environmental implications of natural resource extraction is a major challenge for the building industry. In this study, we look at the feasibility of using Blast Furnace Slag (BFS), a waste product from the steel industry, to make M20 and M30 grade concrete instead of using natural coarse aggregates. Aside from helping with trash recycling, using BFS is a great method to cut back on using natural aggregates. In order to generate twelve separate concrete mixtures for M20 and M30 grades, we used BFS in place of natural coarse aggregates at various percentages (15%, 30%, 45%, 60%, and 75%). A control sample consisted of only natural aggregates. In order to maximize the concrete's performance, a high-performance additive was applied after all of the ingredients had already met the necessary standards. By replacing 15% of the natural aggregates in M20 concrete with BFS, the compressive strength was brought up to standard concrete values, with a small decrease at 30% BFS and above. With 15% BFS, the maximum strengths for M20 were 34.086 N/mm² and for M30, they were 55.442 N/mm². Strength decreased by 15.36% for M20 and 11.63% for M30 at 75% BFS replacement. In order to promote sustainable construction practices such waste recycling and reduced carbon emissions, the results indicate that BFS is a valuable fractional alternative to natural aggregates. Optimal usage of BFS and investigation of its effects on other concrete qualities necessitate additional research.