Mechanical Properties of Concrete Using Residual Aggregates

Abstract

With the increasing consumption of natural resources worldwide, there are great concerns about the environment, making sustainability a prominent issue regarding the quality of life and survival of living beings. This research aims to analyze concrete mixtures with construction and demolition (RCD) through axial compressive strength tests. The concretes studied were molded with substitution of two contents of residual aggregate, ie substitutions of 15 and 30% of the coarse aggregate by RCD, the cement was also partially replaced by two pozzolans in binary and ternary mixtures, in which they were made. substitutions of 25% of cement by rice husk ash (CCA) and 25% of fly ash CV) for binary mixtures, while for ternary substitutions levels were (15 + 10)% (CCA + CV). For the tests of resistance to axial compression were molded cylindrical specimens of dimension 10x20cm and cured in a humid chamber for a period of 28 days. Through the results it could be seen that in relation to the reference trait (without substitutions), the pozzolan concretes, in both binary and ternary mixtures, obtained resistance to axial compression very close to the reference, whereas the molded traces with substitutions of aggregates only resulted in much lower axial compressive strength. However, it was concluded that in relation to the axial compressive strength the use of RCD in concrete is feasible, but when using pozzolans in the mixture.