AN EXPERIMENTAL STUDY ON THE BEHAVIOR OF HSC IN REPLACEMENT OF CEMENT WITH COAL WASTE ASH & LIMESTONE POWDER

Coal waste ash (CWA) is produced primarily from burning of coal in coal fired power plants. CWA is an industrialized waste material used as a partial replacement material in replace with ordinary Portland cement in concrete. In this study, CWA is used as a primary material which varies from 0 to 40% and limestone powder is used as a secondary material which is constantly kept as 10% in replacement of cement and these mixes are compared with normal concrete mix with OPC. Mechanical properties are studied compressive strength, split tensile strength and flexural strength are carried out with different proportions of CWA (0, 10, 20, 30 & 40) % and constantly LSP as 10% in cement with different curing periods of 7, 14, 28 & 60 days. And durability properties such as sorptivity, acid resistance and sulphuric resistance test are carried out at the period of 60 days to determine the resistance ability against chemical attacks while maintaining the desired engineering properties. And micro structure analysis such as SEM is carried out to know the mortar bonding in cement paste. The major aim of the study is to decrease the usage of cement by replacing it with an industrialized waste material and obtaining superior performance in concrete properties by comparing it with conventional concrete. The test result shows that replacement up to 30% of CWA with 10% LSP increases the performance of concrete as compared to conventional concrete. From this experimental observation overall replacement of 40% (30% CWA & 10% LSP) is recommended in this project work.