Sustentabilidade na Construção Civil: um estudo acerca da produção de concretos com agregados reciclados e resíduo de tijolo moído

Abstract

The civil construction sector is one of the largest consumers of scarce natural resources, besides being a large generator of construction and demolition waste (CDW). Thus, it is necessary to study ways to reintegrate this waste into the production chain in order to promote more effective sustainable practices. This study focuses on the evaluation of the performance of concrete produced with partial replacement of coarse natural aggregate (CNA) by recycled concrete aggregate (RCA) and partial replacement of cement by waste brick powder (WBP). For this, it was followed by the characterization and dosage of the materials. Series were produced varying from 0% to 30% the replacement content of cement by WBP, and series with 30% replacement of CNA by RCA, with incorporation of WBP in replacement of cement varied from 0% to 30%. The concrete samples produced were tested to identify the slump, compressive strength, tensile strength by diametrical compression, water absorption by immersion and capillarity. In agreement with the literature, the results of the analysis of mechanical resistance and durability pointed to the effect of microfilling the voids of the cementitious matrix when WBP is used at low replacement levels. The use of RCA increased considerably the porosity of the concrete and reflected in the other properties. The variation void ratio and absorption were more expressive in these substitutions. As for the tests performed to evaluate the mechanical strength, no significant losses were identified for all series produced.