Influence of voltage on chloride diffusion coefficients from chloride migration tests

A chloride migration test method is described and test results are given for concrete subjected to a range of potential gradients. A method for setting the potential across the sample length using reference electrodes and Luggin capillaries is described. Apparent and effective diffusion coefficients were calculated from chloride break-through time and steady state chloride flux respectively at each potential. Accounting fdr polarization and iR drop losses is significant particularly at lower applied potentials.