Estudo do uso de resíduos da construção civil em concreto para pavimentação

Abstract

The debris produced by construction works is a major problem for the environment, because it does not have an adequate treatment and because its disposal occurs, in most cases, irregular. Considering these problems, the objective of this work is to study the use of these debris, known as RCC, in concrete for paving and to evaluate its performance as a large recycled aggregate. The concretes were made with different RCC contents replacing the natural bulk aggregate in 5%, 10% and 15%. In order to evaluate the mechanical performance of each mix, tensile strength tests of these concretes were carried out, following the ABNT NBR 12142/2010 standard, having as a parameter, the minimum strength of 4.5 MPa and the simple, controlled compression test By ABNT NBR 5739/2007. Concrete retraction tests were also carried out every 7 days, based on ASTM C157 / C157M / 2008, to evaluate the occurrence of possible pathologies due to concrete drying. The results obtained with the substitutions were, in due proportions, satisfactory, surpassing in some cases the values of the reference concrete. An example is the trait with 15% substitution, which was the one that best behaved in general, retracting about 65% less than the reference trait, and practically obtaining the same tensile strength at the flexion reached by the reference, arriving It is concluded that there is feasibility in the use of these concretes in practice as pavement.