Two-Dimensional Numerical Simulation of Carbonation Process Considering Stress State

Abstract:

Numerical simulation provides a new way for concrete carbonation research, both for mechanism and engineering application. In order to quantitatively evaluate effect of carbonation process of concrete section corner under stress state, a two-dimensional (2D) numerical model of carbonation process, which takes account of the effects of concrete composition and stress state, is presented in this paper. The process to develop the numerical program is also introduced, the effects of element size and time step are discussed. The numerical program is verified by comparing calculation results with some existing carbonation experiments results, which turned out a good coincide. Finally, an example is used to illustrate the effect of stress state on the carbonation process of concrete section corner. The results show that the carbonation rate in the corner of concrete section is faster than others due to acceleration effects of the two-dimensional diffusion of carbon dioxide into concrete and tension stress state, and attention should be paid to the durability of concrete section corner.