Published Paper Details:

Now a days increase in population increases the demand of concrete for construction purpose and Aggregates are the important constituents in concrete. Re-use of demolition waste avoids the problem of waste disposal and is also helpful in reducing the gap between demand and supply of fresh aggregates. This research deals with partial replacement of natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) of age group 15, 25 & 35 years in different proportions like 20%, 30%, 40%. For this, M20 grade of concrete is adopted. Curing of specimens were done for 7days and 28 days to attain the maximum strengths. Partial replacement of fine aggregate with Silica Fume at 5%, 10%, 15% were done to gain more strength. After casting the specimens of RCA with Silica Fume replacement, curing was done and the specimens were tested for compressive and tensile strengths. Obtained results of compressive and tensile strengths of RCA concrete mix were compared with conventional concrete. In this direction, an experimental investigation of compressive and tensile strength was undertaken to use RCA as a partial replacement in concrete. It was observed that the concrete with recycled aggregates of 15,25, & 35 years age group achieved maximum compressive strength and Split tensile strength at 40% Replacement of NCA with 15yrs RCA, at 15 % replacement of NCA with 15yrs RCA and replacement of Fine aggregate with Silica Fume, at 30 % for Replacement of NCA with 25yrs RCA, at 15% for Replacement of NCA with 25yrs RCA and replacement of Fine aggregate with Silica Fume, at 20 % for Replacement of NCA with 35yrs RCA.