Modeling of autogenous volume deformation process of RCC mixed with MgO based on concrete expansion experiment

Abstract To improve concrete crack prevention performance for high concrete dams, several studies have shown that the addition of MgO-type expansive can compensate for shrinkage of concrete and prevent concrete from cracking. In this paper, the Autogenous Volume Deformation (AVD) process of MgO concrete as a function of curing age, temperature and MgO content has been presented. The objective of this paper is to develop a hyperbolic expansive model, in which the parameters are developed and validated for the modeling of AVD process of MgO concrete and compared with Shu-hua Liu’s method. In addition, the correction coefficients have been proposed and the relationships between the model parameters and MgO content have been also introduced. The model parameters were obtained based on the experimental data under laboratory conditions for the AVD process. Then the final equation of the hyperbolic expansive model is determined by the MgO content, the curing temperature and time. The calculation results are then compared with the measured data; and the reasonably good correlation between simulated and measured results indicates that the selected values of G pre , c(T) , and the relationships between model coefficients, MgO content, and temperature, are almost perfect. It will enhance the design reliability of the Linxihe RCC arch dam project and others.