International Journal of Environment
(ISSN: 2186-6872 (print). 2186-0009 (online))

Strength Behaviour of Recycled Concrete with Partial Replacement of Conventional Aggregate
Md. Siddikur Rahman, Md. Bellal Hossain, Reza Ruksana
A comparative analysis of the experimental results of the strength properties of concrete with different replacement ratios for conventional aggregate with recycled aggregate is presented in this paper. Forty years old concrete was used for making recycled coarse aggregate. Five types of concrete mixtures were tested: One type of concrete was made with conventional aggregate (brick chips) as a control concrete and other four types were made with 25%, 50%, 75% and 100% replacement of recycled coarse aggregate. One hundred twenty cylindrical specimens (75mmx150mm) were made for testing the compressive and tensile strength at 7, 14, 28, and 90days of curing. The performance of recycled concrete with partial replacement of conventional coarse aggregate is found satisfactory. At 28 days, the maximum tensile strength was found to be 2.4 MPa and compressive strength was 16 MPa for 50% replacement of recycled coarse aggregate. Concrete with mixture of conventional and recycled aggregate gives higher strength than the concretes made with brick chips only or 100% recycled coarse aggregate.
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