Abstract
The present study deals with investigating the effects of using coarse recycled concrete aggregates (RCA) on compression & split-tensile resilience of M25 grade concrete mixes. Five different mixes of modified recycle aggregate concrete (RAC) were designed and prepared considering replacement proportion of normal coarse aggregates as 0, 25, 50, 75, and 100 % with RCA. The specimens were prepared according to Indian standard codal provisions and experimentally tested for its mechanical characteristics in laboratory conditions. A steep degradation in compressive and tensile strength on increasing RCA proportion was observed, which may result due to improper bonding at interfacial region in RAC mixes. To overcome this strength deterioration, the effect of adding pozzolanic materials like silica fumes is also studied for making strength improvements. The silica fumes as admixture, in percentages of 4%, 8% and 12%, was added in RAC mixes for finding the optimum proportions. Overall, the study provides a sustainable solution for problematic concrete waste dumping while utilizing it in casting new concrete structures of significant strengths.
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