Comparative Study of Strength Properties of Green Concrete and Conventional Concrete

The present study reports the mechanical properties of green concrete which contains recycled aggregates (RCA) sourced from local construction and demolition wastes and flyash sourced from industrial waste. For green concrete RCA was used as 50% replacement to natural coarsed aggregates (NCA) and flyash was used as 30% replacement to cement.In this study, three series of concrete mixtures were prepared with water cement ratio (W/C) of 0.3, 0.4 and 0.5.Each series comprises of two concrete types named as conventional concrete mixture with 0% RCA and 0% flyash indicated by notation R0.And green concrete mixture with 50% RCA and flyash was incorporated as 30% replacement to cement indicated by notation R50F30. The study shows that Green concrete compressive strength is 10 to 12% lesser than conventional concrete. Hence incorporation of 30% flyash does not made much difference in compression strength gain. However, the reduction in compressive strength can be compensated by a decreasing the W/C ratio.The green concrete mixture and the results shows that split tensile strength of Green concrete [R50F30] decreased by 15 to 22% compared to conventional concrete [R0]. Hence the incorporation of flyash in green concrete [R50F30] decreased the tensile strength of concrete compared to conventional concrete [R0].