Experimental and Theoretical Prediction Model Research on Concrete Elastic Modulus Influenced by Aggregate Gradation and Porosity

In this research, we developed a four-phase model, which takes the aggregate gradation and porosity into account in prediction of elastic modulus concrete, based on micromechanical theories. The model has been verified with experimental results. First, using Mori Tanaka differential self-consistent (DSC) methods, pores both mortar interfacial transition zone (ITZ) were homogenized. Then, continuously graded aggregates divided finite size intervals. Further, generalized multiphase composite derived from method, an for concrete was developed. By simulating expanded polystyrene sphere (EPS) grains, effect overall investigated. research results show that have remarkable influence proposed is effective to estimate deviation between predicted less than 8%. decreases increasing ITZ porosity. However, exceeding 40%, decrease large For fixed porosity, owned more influences concrete. Enhancing decreasing thickness are efficient