MODELING OF CHLORIDE DIFFUSION IN CONCRETE AND DETERMINATION OF DIFFUSION COEFFICIENTS

In this paper, a new form of mathematical model for chloride ingress in concrete is presented to review the process of chloride ingress in saturated and unsaturated concrete. Material parameters reviewed are the ion diffusion coefficient and solution diffusion coefficient, both of which have been shown to be concentration dependent, rendering the chloride diffusion process to be nonlinear. A simple experimental methodology and a calculation procedure are proposed enabling the estimation of chloride diffusion coefficients from experimentally determined chloride and solution profiles in a short time.