The aim of this research is to record the impact of specific changes in the molding water alkalinity on the hydraulic conductivity of a compacted bentonite-sand mixture. Adding alkalinity to the molding water influences the charge density existing on the clay particles. This can increase the amount of separation of the bentonite particles which causes a decrease in the hydraulic conductivity of the compacted mixture. At the optimum alkalinity the mixture possesses the smallest hydraulic conductivity. In this research an optimum alkalinity (pH=10.1) for a compacted bentonite-sand mixture (7.5% bentonite) was derived from the liquid limit test and the falling-head permeability test.
Influence of alkalinity on the hydraulic conductivity of bentonite-sand liners
David G. Wareham, Arman Farajollahi, Mark W. Milke; Influence of alkalinity on the hydraulic conductivity of bentonite-sand liners. Water Sci Technol 1 July 1998; 38 (2): 151–157. doi: https://doi.org/10.2166/wst.1998.0127
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