Analysis of Strength of Concrete by Using Recycled Aggregates (KEY IJP************622)

• Afsha Khan,Bhavna Patil,Satish Patel

Abstract

An experimental study of recycled aggregate concrete (RAC) using recycled coarse aggregate (RCA) is reported. The RCA was obtained from construction and demolition waste (C&DW) and used as full replacement of natural coarse aggregate (NCA) for production of RAC. Crushed granite was used as NCA while crushed concrete rubble from a demolished concrete building was used as RCA. Batching of concrete was done by weight using concrete mix ratio of 1:2:4 and watercement ratio of 0.5. A total of 96 standard concrete cubes were cast and cured. Two groups of concrete mixtures were tested: 100% NCA as control and 100% RCA. Bulk density and compressive strength of concrete cubes were conducted at 7, 14, 21, and 28 curing days respectively. The results showed that bulk density and compressive strength of natural aggregate concrete (NAC) were higher than those of RAC for different ages of concrete. The bulk density and compressive strength of the 28-day RAC were 2328 kgm3and 29.42 Nmm2respectively which satisfied British Standards Institution (1997) BS 8110-1:1997 requirements for structural concrete.