A direct method for determining chloride diffusion coefficient by using migration test

Calculation of the effective diffusion coefficient is proposed using an analytical model based on Nernst–Planck equation, on electroneutrality and on measurements of current intensity. To validate this approach, migration tests were carried out on different w/c mortar samples. In steady state, the resulting effective diffusion coefficients are larger than those usually obtained with models based on Nernst–Planck equation without electroneutrality. An explanation of these differences and the importance of electroneutrality are discussed in the present work.