Typical examples of the application of this method are given. The main advantage of this approach resides in the fact that the diffusion coefficients of all ionic species present in the system can be calculated using a single series of data. A simple algorithm is used to determine for each experiment the tortuosity factor that allows to best reproduce the current curve measured experimentally. Experimental results are then analyzed using the extended Nernst-Planck-Poisson set of equations. The test procedure is relatively simple and consists in measuring the evolution of the electrical current passing through the sample. Consequently, a more rigorous approach to analyze migration test results is presented. However, a thorough analysis of the various transport mechanisms that take place during a migration experiment suggests that some of them are probably not valid. In many cases, the interpretation of test data is based on a series of simplifying assumptions. Over the past decade, various approaches have been proposed to analyze migration test results. Migration tests are now commonly used to estimate the diffusion coefficients of cement-based materials.
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