Estudo do comportamento mecânico do concreto contendo resíduos de construção e demolição utilizando um modelo de dano isotrópico

Abstract

This paper has as a goal to describe the mechanical behavior of the CDW recycled concrete in compression, using a model of isotropic damage adapted to the variation of contents of substitution of natural aggregates by recycled ones. The methodology that is presented uses the isotropic model by Mazars as a constitutive equation for the CDW concrete writing its adjustment parameters Ac and Bc as square polynomials according to the percentage of the aggregate substitution. Mixtures with water/ciment relationship equal to 0,45 and 0,80 were analyzed. The model was evaluated for conventional concrete and recycled concretes with 50 % and 100 % of aggregate substitution. The results show good approximation between the analytical and numerical values obtained with the adapted isotropic model of damage and experimental tests of axial compression and resistance to split tensile strength in the flexural strength of the concretes.