In the waste management context, clays are frequently used for their confining properties. Thanks to their low hydraulic conductivity and their chemical retention properties towards solutes in solution, clay materials allow delaying the contaminant dissemination. In this study, anionic transport properties of conditioned clay are approached by diffusion and permeation experiments. Clay samples are conditioned with CaCl2 10-3M or NaCl 10-3 M and transport of water and chloride are monitored at chemical equilibrium using labelled solution with HTO and 36Cl as tracers. Anionic exclusion reduces transport parameters of chloride compared to those of water. Chloride transport is more difficult through the Na-conditioned clay than through the Ca-conditioned one due to pore organisation. Microstructure observation of this Na-conditioned material shows a preferential orientation of the clay platelets which could increase the path length of the solute through the clay sample.
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