Numerical Simulation of Two-dimensional Chloride Diffusion Meso of Recycled Concrete

concentration distribution by using differential equation of similarity of two-dimensional heat conduction theory and two-dimensional Cl-diffusion theory. Random aggregate model of Recycled concrete mesostructure is set up in the first place, then, the simulation is carried out on Cl-concentration distribution by using ANSYS software. The results obtained from the numerical simulation indicate that the distribution of chloride concentration is non-uniform within the recycled aggregate concrete, and the chloride concentration declines in waves along the diffusion depth; The chloride concentration in the recycled aggregate concrete shows the tendency of increase along with the increase of the content of recycled brick, the content of recycled aggregate, age as well as the diffusivity of the old interfacial transition zones, in other words, the durability of the recycled aggregate concrete becomes worse and worse.