MODELING OF CONCRETE IN EARLY AGE AS ELASTO-PLASTIC POROUS CONTINUUM

In the analysis of early age concrete structures with initial thermal stress fields caused by hydration heat of cement, the consideration of time dependent constituive relation is very important. In this study, early age concrete is modeled as a two phase material consisting of aggregates having elastic behaviour and cement paste which fills the voids between aggregates together with water having elasto-plastic behaviour. Plastic formulation was performed with Drucker-Prager failure criterion with the consideration of the effect of maturity of concrete on the cohesion and angle of internal friction of cement paste. An experimental study was carried out to investigate the time dependent characteristics of these two material parameters. Finally, a numerical simulation was carried out using Finite Element Method for this two phase non-homogeneous material and results were compared with experimental data.