DEMOLISHED WASTE CONCRETE POWDER AS PARTIAL REPLACEMENT OF CEMENT

Abstract

This study deals with the Partial replacement of cement by using demolished waste concrete powder(DWCP). In developing countries like India huge quantities of demolition wastes are generated in every year. Out of which very small amount is recycled or reused. Due to strict environmental laws and lack of dumping sites in urban areas, demolished concrete waste causes disposal problems. In this study the application of recycled concrete waste in concrete block as partial replacing of cement was evaluated. The effect of age of demolished concrete in partial replacement of cement was also checked in this study. For that DWCP having age 10years, 15years, 20years and 25years were collected and concrete test blocks were casted with each WDWCP at 0, 10,15,20,25 and 30 percentage replacement with cement. The blocks produced were tested to determine their compressive strength and split tensile strength. The result shows that up to 20% replacement of cement with DWCP, the compressive strength of concrete increasing and after that there is a sudden decrease in compressive strength. The result also shows that the age of demolished concrete powder has no significant effect on strength of concrete.