A study was conducted to determine the effect of freeze-thaw cycling concurrent with municipal solid waste (MSW) landfill leachate on the hydraulic conductivity of a geosynthetic clay liner (GCL). The GCL was hydrated with MSW landfill leachate and subsequently subjected to 5, 10, 15 and 20 freeze-thaw cycles. After the prescribed numbers of freeze-thaw cycles was met, the hydraulic conductivity of the GCL was tested in a flexible wall permeameter. Hydraulic conductivity of GCL experienced freeze-thaw cycles was slightly higher than those without frozen, with the hydraulic conductivity increased with increasing of number of freeze-thaw cycles. The increase in the hydraulic conductivity of GCL could be a result of the contraction of double-layer, resulting from the increases in the concentrations of cations in the pore water (i.e., MSW landfill leachate) induced by freeze.
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Financial support for this study was provided by National Natural Science Foundation of China (NSFC), under Grant No. 41602291.
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