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Effect of temperature on hydration of geosynthetic clay liners in landfills

机译：温度对垃圾填埋场合成粘土衬里水化的影响

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摘要

Geosynthetic clay liners (GCLs) have gained popularity as a barrier system in modern landfill construction. As such, it is depended upon to provide a level of impermeability to prevent the escape of contaminants into the surrounding soil and groundwater. It has been proven that a GCL's hydraulic conductivity is closely related to its moisture content. GCLs are known to absorb moisture from the underlying soil after installation. In a landfill, temperatures near the liner can reach upwards of 55℃. The effect of these elevated temperatures on the hydration process of the GCL was determined for two types of GCL over two types of subsoil: sand and clay. It was found that elevated temperatures prevented the GCL from reaching moisture content levels that would be acceptable in a real-life scenario. Temperatures in landfills could be expected to cause a GCL to reach a moisture equilibrium at roughly 16% gravimetric moisture content, where GCL at room temperature would reach higher than 100% gravimetric moisture content. The significant difference in moisture equilibrium of GCLs at different temperatures may suggest that the heat naturally produced in landfills could negatively affect the liner's hydraulic performance. The importance of allowing a GCL to properly hydrate before heat exposure must be better understood in order to minimize the potential negative effect of a landfill on our environment and our livelihood. This study also confirmed that the hydration potential of GCL depends on the method of GCL manufacture and the subsoil characteristics.
机译：土工合成的粘土衬里（GCL）作为现代垃圾填埋场的屏障系统已广受欢迎。因此，必须提供一定程度的不渗透性以防止污染物逸出到周围的土壤和地下水中。事实证明，GCL的水力传导率与其水分含量密切相关。已知GCL在安装后会从下面的土壤中吸收水分。在垃圾填埋场中，衬板附近的温度可能高达55℃。在两种类型的底土上，对于两种类型的GCL，确定了这些高温对GCL水化过程的影响：沙子和粘土。已经发现，升高的温度阻止了GCL达到水分含量水平，这在现实生活中是可以接受的。垃圾填埋场的温度可能会导致GCL在大约16％的重量水分含量下达到水分平衡，而在室温下的GCL将达到100％的重量水分含量以上。 GCL在不同温度下水分平衡的显着差异可能表明，垃圾填埋场自然产生的热量可能会对衬砌的水力性能产生负面影响。必须更好地理解让GCL在暴露于热之前适当地水合的重要性，以最大程度地减少垃圾填埋场对我们的环境和生计的潜在负面影响。这项研究还证实了GCL的水合潜力取决于GCL的生产方法和底土特性。

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