Strength Characteristics of M25 Grade Concrete by Partially Replacing Cement with Rice Husk Ash and Fine Aggregate with Copper Slag

concrete is a highly demanded construction material which is used in construction industries which becomes present days high expensive due to the corresponding increase in the demand in construction among which lesser availability of sand is major concern hence there is a need to find alternate for sand. Copper slag is one of the waste material which can be replaced by sand available free of cost thus the cost of construction can be lowered. In this project work cement is partially replaced with Rice Husk Ash as 15% fixed by weight of cement & fine aggregate is partially replaced with copper slag as percentage ranging 0%, 10%, 20%, 30% & 40% by weight of sand for M25 grade concrete. And tests conducted on hardened concrete is compressive strength test, split tensile test , flexural strength test and sorptivity test after specimens are cured for 7, 28 days curing. The effect of Rice Husk Ash and Copper Slag on mechanical properties of concrete were analyzed and compared with normal concrete. In comparison with normal concrete, the compressive strength after 28days is increased in 8.27% for 30%. The split tensile strength after 28days is increased in 32.09% for 30%. The flexural strength for 28days is increased as 15.29% for 30%. And by the sorptivity test is found that, as the percentage of copper slag increases then there will be decrease in water absorption.