Water-Holding Property of GMZ Bentonite-Sand Barrier/Backfilling Mixtures
Abstract:Bentonite-sand mixtures is often considered as possible buffer backfilling materials in underground repositories for high-level radioactive waste disposal. Both the pressure plate and vapor transfer technique designed by the authors are used to measure the soil water characteristic curve of B/S for understanding the effects of initial saturated condition, sand ratio, dry density, chemical and temperature on the water-holding capacity in drying process. It is found that, the water-holding capacity increases much for the mixtures saturated under free condition compared with the mixtures saturated under confined conditon. The water-holding capacity decreases slightly with the increase in sand ratio and dry density. While the water-holding capacity increases slightly with the concentration of Na+ in pore liquid increasing from 0 g/L to 12 g/L, similar with leachating from surrounding rock in the candidate area for high-level radioactive waste repository of China. Besides, the water-holding capacity under different temperature from 20 °C to 60 °C tends to the same.
Document Type: Research Article
Publication date: December 1, 2011
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