Strength Performance of Concrete Incorporating Coarse Recycled Aggregate

This paper presents the influence of different amounts of recycled coarse aggregate (RCA) obtained from a demolished reinforced concrete (RC) building near Bhubaneswar region, about 15-20 years old, on the strength performance of concrete. To analyze the behavior of concrete, RCA with replacement of 10%, 20%, 30%, 40%, 50% are used in M30 grade concrete mix. The mix proportion used in this study was 1:1.15:2.73 with w/c is 0.40. The mix proportions are prepared with two types of cements i.e. Ordinary Portland Cement (OPC) and Portland Pozzolana Cement (PPC). The properties namely compressive strength, flexural strength and split tensile strength are studied after the curing period of 7, 28 and 90 days. From the experimental result it is observed that there is very slight difference in the compressive strength, flexural strength and split tensile strength of concrete upto 20% replacement of RCA and there was a noticeable reduction in workability with the increase in replacement ratio. The test results also indicate that the early age compressive strength is higher for concrete made with OPC and RCA and later age strength is higher for PPC and RCA.