Análise estatística da resistência à compressão e módulo de elasticidade de concretos com agregados de resíduos

Abstract

Civil construction is an important indicator of a country's economic and social development, but it is also an activity that generates environmental impacts and its residues have been a major problem for society. Part of the waste generated, especially that of concrete, can be transformed into aggregates and replace part of the natural aggregates. The objective of this study was to evaluate the impacts of substituting natural coarse aggregate for recycled concrete aggregate (RCA) on the mechanical properties of concrete. The starting point was the creation of a database formed with results of compressive strength and modulus of elasticity available in the literature. These data were used in statistical analyzes that took as a reference the results corresponding to concretes with natural aggregates. The compressive strength in RCA concretes showed that the variation in relation to the reference concrete increases as the substitution content increases, the same behavior was observed for the elastic modulus. The concretes with recyclable aggregates showed great heterogeneity, with a minimum variation coefficient of 57 for compressive strength and 39 for the modulus of elasticity.