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Abstract

In this investigation, the evaluation of a modified MDC-25 asphalt mixture is carried out with substitution of the ¾” fraction of the stone aggregate by RCA, and its behavior in mechanical resistance under monotonic load and resistance to moisture damage. In order to reduce the environmental impact generated by RCA construction and demolition waste, evaluating the characteristics of a conventional MDC-25 mixture and a mixture with substitution of the ¾” fraction for RCA, assuming that the resistance of the asphalt mixture with Substitution complies with the specifications of the Invias version 2013 to be used as an alternative design in the construction of the country. Subsequently, the characterization of the materials was performed, replacing the MDC-25 asphalt mixture (60/70 asphalt cement, conventional natural aggregate, RCA material). Using the mix design of the Marshall method, under the INV.E-748 standard and the resistance to moisture damage of the mix, INV.E-725, a test and dosage plan was created for the asphalt mix varying the percentage of asphalt content and the replacement of the ¾” fraction of the mix by RCA, in order to determine stability and flow values of the mix. Samples are made for an MDC-25 mixture with conventional stone aggregate and others with the substitution of the ¾” fraction for RCA. In the modified asphalt mix, the ¾” fraction of the coarse aggregate was replaced by RCA, which corresponds to 12.5% of the total aggregate. Asphalt percentages were defined (4.5%, 5.0%, 5.5% and 6.0%) in order to find the optimum.