Abstract
From a strictly theoretical point of view Fick's second law could not be used to analyze the chloride ion migration data through cement based materials. The proper formalism would be an integrated one combining both Nernst and the electrical double layer theories. However Fick's second law could still be used, for concrete, purely on an empirical basis. To ascertain this possibility the chloride migration data, from a number of concrete samples, has been analyzed. The results indicate that the assumption of a constant chloride ion diffusivity, through a sample, is seldom satisfied. An increasing or a decreasing diffusivity with depth could be observed depending upon the history of the sample. The results call for further investigation. The technique of electro-assisted chloride diffusivity measurement has been commented upon. It seems that the use of the measured, by any method, chloride diffusivity data to calculate the long term chloride penetration depth in a structure is uncalled for and may give misleading predictions.
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