Properties of Concrete with Coal Washery Rejects Partial Replaced as Coarse Aggregates

Abstract

The demand of natural aggregates is rapidly becoming high day by day in the construction industry. Various attempts are being made to find substitutes for natural aggregates. In India, about 70% of electricity is produced by combustion of good quality coal. In the process of coal washing, large quantities of impure coal are being rejected and causing disposal problems. These rejected impure coals are called as Coal Washery Rejects (CWR). To maintain the environmental sustainability, an attempt has been made in the present study to use new material CWR as partial replacement of coarse aggregate in concrete. In this study, coarse aggregates are partially replaced by CWR at different levels (0% - 40%). The Compressive strength , Split tensile strength ,Bond, and. Durable properties RCPT, Drying shrinkage, Water absorption, porosity, of concrete were resolved at various curing periods and contrasted with M25 evaluation of conventional concrete (CC).