ABSTRACT
This paper reviews the theories and assumptions of some existing prediction models for chloride ingress into concrete. Most models are confined to fully saturated pore flow conditions with the assumption of constant diffusion coefficient. However, these conditions and assumption are solely for mathematical convenience. Phenomenological studies are primarily based on the application of the Fick’s laws for diffusion and the Nemst-Planck equation for ion migration to historical data. Attention is given to predicting chloride movement in unsaturated flow conditions, which may be more realistic of the average state of water pore saturation for concrete structures.
