ABSTRACT
The control of concrete shrinkage is of great significance for quality of construction and service performance of concrete structural, and the accurate prediction of shrinkage behavior is also important. Among the random distribution of aggregate particles, the concrete shrinkage occurs in cement mortar, which is heterogeneous spatially and complex temporally. However, the common simulations in existing research usually simplified the concrete material as homogeneous phase and cannot reflect the local shrinkage crack at material scale, which can be unexpected transport path for adverse environmental substance. Based on the accuracy material model, which is built with aggregate, cement mortar and interfacial transition zone, a numerical simulation method is proposed herein for concrete shrinkage. Considering the complex hygro-thermo-chemical process, the model includes the fields of humidity, temperature, and concentration of critical chemics like cement and silica fume. Combined the distribution of mechanical state, the detailed stress and deformation distribution can be simulated along the chemical reaction and aging process. Compared with the shrinkage test results of concrete material with different mixing proportion, the model is verified. Based on the proposed shrinkage, the interesting topic including the effect of material parameters are discussed.
