Abstract

This paper series includes two parts: (1) theoretical considerations and (2) experimental evaluations. In Part 1, the chloride ion diffusion and migration processes in a pure solution system as well as in a solution-concrete system have been theoretically analyzed. The relationships between different diffusion coefficients from the conventional diffusion or migration tests have been established. In this, the second part, the parameters influencing the “effective” diffusion coefficient, such as activity coefficient, counter-electrical field, and the friction coefficient due to the ionic interaction, are quantitatively evaluated with available experimental data. The results show that the concentration dependence of chloride diffusion and migration can be quantitatively described by two decisive parameters: K τ and f; the former describes the effect of counter-electrical field and the latter describes the friction effect. The theories fit the experimental data fairly well. Some phenomena of ion diffusion in concrete can be explained by these theories, such as the differences in diffusion coefficient between diffusion and migration tests and between cations and anions.

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