COMPARISON OF COMPRESSIVE AND FLEXURE STRENGTH OF FINE AND COARSE AGGREGATE REPLACED CONCRETE WITH REFERRAL CONVENTIONAL CONCRETE

Abstract

Concrete is prime construction material used in practice. No construction can be dreamed without use of concrete. The main constituents of concrete such as sand, stone and water are naturally available. These resources of natural aggregates (sand, stone) are depleting day by day due to over exploitation for the sake of developmental activities. It is worthwhile to seek alternative for naturally available aggregates. The aim of this study was to investigate the possibility of using stone dust as partial replacement of fine aggregate and recycled aggregate as partial replacement of coarse aggregate. In the present study cubes and beams were cast to determine the compressive and flexural strength of concrete made using stone dust and recycled aggregate as replacement of natural aggregate. Concrete of M25 grade was designed for a W/C ratio of 0.48 for the replacement of 10% coarse aggregate wit h recycled coarse aggregate and replacement of 30% and 40 % of fine aggregate (sand) with stone dust. The result indicates that the replacement of fine aggregate with stone dust and coarse aggregate with recycled coarse aggregate simultaneously are not reliable for compressive strength. Results shows that with partial replacement of stone dust with 0%, 30% and 40% and 10% recycled coarse aggregate, flexure strength increased by 26.4%, 16.67% and 21.87% at the age of 28 days respectively as compared to referral concrete whereas with 10% replacement of recycled coarse aggregate there is Increase in flexure strength by 26.4% at the age of 28 days compared to referral concrete.