Abstract
AbstractThis study investigates the influence of quality of parent concrete (PC), from which recycled coarse aggregates (RCA) are procured, on mechanical properties of recycled aggregate concrete (RAC) for weight replacement percentages of 50 and 100%. Normal-strength concrete (NSC), medium-strength concrete (MSC), and high-strength concrete (HSC) are three types of PCs manufactured using natural coarse aggregates (NCAs) with compressive strengths of 20 MPa, 40 MPa, and 60 MPa, respectively. At both the replacement levels, PC had an appreciable effect on the properties of all the three grades of RAC studied. The properties of RAC, produced by using RCAs procured from the high-strength PC, in general, were superior to that of the RAC made with RCAs procured from the PC of NSC and the MSC. To validate the experimentally acquired results, correlations between mechanical properties were constructed. The dependence of concrete characteristics on PC and RCA replacement levels was established using linear equations. The results of the current study reveal high-strength PC should be preferred for making RAC.KeywordsCompressive strengthElastic modulusParent concreteRecycled aggregate concreteStatistical analysis
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