The performance of five different GCLs (two GCLs with standard sodium bentonite and three GCLs with polymer enhanced bentonite) subjected to three different climatic modes of wet-dry cycles simulating conditions to which a GCL might expose in cover systems over a prolonged time is reported. The wetting cycles lasted for 8 h, while the drying cycles varied between 16 h, seven days, and 14 days. It is shown that after around a year of accelerated aging, the hydraulic conductivity of the aged GCLs increased notably when permeated with tap water at an applied effective stress of 15 kPa for a range of heads (0.07, 0.14, 0.21, 0.49, and 1.2 m). The combined effects of the number and the duration of the wet-dry cycles, the GCL's mass per unit area, the carrier geotextile, the size and the number of the needle punch bundles, and the thermal treatment to bond the needle-punch bundles to the carrier geotextile are discussed. The poor hydraulic performance of the polymer-amended/modified bentonite GCLs is discussed.

五种不同的 GCL（两种带有标准钠膨润土的 GCL 和三种带有聚合物增强型膨润土的 GCL）在三种不同气候模式下的干湿循环模拟条件下的性能报告了 GCL 可能在覆盖系统中长时间暴露的条件。润湿周期持续 8 小时，而干燥周期在 16 小时、7 天和 14 天之间变化。结果表明，经过大约一年的加速老化，当在 15 kPa 的施加有效应力下，对于一系列水头（0.07、0.14、0.21、0.49 和 1.2米）。干湿循环的次数和持续时间、GCL 的单位面积质量、载体土工布、针刺束的尺寸和数量的综合影响，并讨论了将针刺束粘合到载体土工布上的热处理。讨论了聚合物改性/改性膨润土 GCL 的差的水力性能。