Chloride ingression in cracked concrete under saturated state

Abstract

Chloride transportation was divided into stationary and flowing solution states to investigate the mechanics of chloride transportation in cracked concrete under saturated condition.The behaviors of time-dependent surface chloride concentration and chloride diffusion coefficient in concrete were analyzed by dual porous medium model,and the behavior of linear bonding between concrete and chloride was analyzed by two-dimensional diffusion model,respectively.The governing equations of chloride ions diffusing into concrete and cracked concrete were described by the Fick's 2nd law considering the effect of crack self-healing.Comparisons between the experimental and the numerical results showed the effectiveness of the proposed models.Dual porous medium model and two-dimensional diffusion model are both applicable for the short term ingression of chloride,and the two-dimensional diffusion model is more appropriate to the long term simulation.