Bentonite has been proved to be effective to enhance the membrane behavior of pure clay for barrier performance improvement against the migration of contaminants. In this study, the membrane behavior of locally available natural Fukakusa clay, amended with 5% sodium bentonite, was evaluated. The chemico-osmotic efficiency coefficient, ω, which quantifies how much a certain soil acts as a semipermeable membrane, was obtained under different concentrations of KCl solution (0.5, 1, 5, 10 and 50 mM) and at different compaction degrees that ranged from 80% to 100%. According to the results, membrane behavior, ω continually decreased as the KCl concentration increased, which is consistent with Gouy-Chapman theory. Compaction degree was found to have a significant effect on membrane behavior, especially at 100% compaction degree conditions, by which the membrane behavior was 30% higher than that at 80% compaction degree conditions.
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