Numerical Simulation of Chloride Transportation Process in Unsaturated Concrete

Abstract:

In order to describe the chloride transportation process in unsaturated concrete components,the convection-diffusion equation of chloride was developed based on the mass conservation law.The parameters in the governing equation and the stabilization of FEM solution process were preliminary discussed.Based on the discussion,the influence of convection effect on chloride transportation process was analyzed quantitatively.The results show that the coupled effect of convection and diffusion will mainly occur in the surface layer of components,and the convection effect will be more obvious in the initial stage of transportation process.Finally,the results of the parameter sensitivity analysis of the numerical model show that the diffusion coefficient ratio between moisture and chloride will greatly affect the chloride transportation process.