A modified micro-mechanics model for estimating effective elastic modulus of concrete

A modified equivalent micro-mechanics model, which is considered based on an initial model of an infinite matrix with an inclusion, has been developed for estimation of the elastic modulus of concrete. It is assumed that aggregate or cement is the inclusion of equivalent model, and elastic modulus of the model is considered according to the volume fraction of each component. The equations of effective elastic modulus are obtained based on this equivalent model, which contains volume fractions of aggregates and voids as its variables. The equations obtained can account for the evolution of interfacial debonding damage between aggregate and cement. The results show that the concrete modulus increases with the increase of aggregate volume fraction. However, the Poisson’s ratio decreases with the increase of aggregate volume fraction.