Constitutive Formulations for Concrete with Recycled Aggregates

Abstract

In this Chapter, a thermodynamically consistent gradient model is proposedfor natural aggregate concrete and then, modified to take into account theaddition of different contents of recycled aggregates and its influence on concretemechanical response. A particular and simple form of gradient-based plasticity isconsidered, where the state variables are the only ones of non-local character. Afterdescribing the material formulation for natural and recycled aggregate concretes,the model calibration is performed with experimental data taken from literature.A comprehensive numerical analysis is presented, where the effects of the recycledaggregate content on the performance of concrete in pre and post-peak behavior areevaluated and discussed, for different stress states. Finally, the ability of the modelto capture the variation of mechanical response of concrete with different recycledaggregate contents is demonstrated for different mechanical tests.