Numerical simulation of chloride penetration in concrete in rapid chloride migration tests

This paper presents a new transport model for describing the penetration of chlorides in cement-based materials. The model uses the concept of double porosity to reflect the influence of pore size distribution on the transport of ionic species in porous materials. In addition to the use of two porosities, the model also considers the effects of ionic exchange between the pores of different sizes, ionic binding between liquid and solid phases, and the boundary-layer effect of the exposed surface on chloride transport. The model is validated using experimental data obtained from rapid chloride migration tests. Good agreement between calculated and measured chloride concentration profiles is demonstrated.