Hysteresis of the water retention curves of geosynthetic clay liners in the high suction range |
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Authors: | Abdelmalek Bouazza Md Abdur Rouf |
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Abstract: | This paper examines two needle-punched geosynthetic clay liners' water retention behaviour at high suction ranges using the vapour equilibrium technique where super-saturated salt solutions controlled the relative humidity. This study shows that the bentonite form and its mineralogy affect the absorption/desorption of GCLs and their corresponding water retention curves. In particular, a granular bentonite-based GCL was found to absorb more and release less water than a powdered bentonite-based GCL due to its higher montmorillonite content and larger pores. The water retention curves of both GCLs exhibited very little hysteretic behaviour at high suction. Repeated wetting-drying cycles shifted the WRCs of both GCLs slightly downward with minimal impact on their degree of hysteresis. |
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Keywords: | Geosynthetics Geosynthetic clay liners Wet-dry cycles High suction Hysteresis Unsaturated |
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