Canadian Geotechnical Journal, Ahead of Print.
A custom-designed apparatus (referred to as the Ageing Column) is used to age a 4.8-mm thick elastomeric bituminous geomembrane (BGM) under single-sided exposure to a synthetic municipal solid waste (MSW) leachate and a synthetic high pH mining solution (pH 11.5) at 55 °C, 70 °C, and 85 °C. This apparatus involves a closer simulation of the BGM's chemical exposure conditions in the field than the double-sided immersion tests in which the BGM is exposed to the solution from both surfaces. The mechanical, rheological, and chemical properties of the BGM are examined to assess the degradation in the BGM components relative to double-sided immersion experiments. While the single-sided ageing of the BGM reduces the degradation rates in the BGM mechanical properties, it does not affect the degradation rate of the bitumen coat relative to the double-sided exposure. Additionally, the exposure of the BGM to the MSW leachate resulted in faster degradation in its mechanical properties but slower degradation in the bitumen coat than that obtained in the exposure to the mining solution. However, predictions of the time to nominal failure of the BGM established using Arrhenius modelling at different temperatures show that the temperature effect is more significant on the BGM durability than the chemistry of the considered solutions.

中文翻译：

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沥青土工膜 (BGM) 在单面暴露条件下的长期性能

加拿大岩土工程杂志，印刷前。
定制设计的设备（称为老化柱）用于在单面暴露于合成城市固体废物 (MSW) 渗滤液和合成高 pH 采矿溶液的情况下老化 4.8 毫米厚的弹性沥青土工膜 (BGM) （pH 11.5）在 55 °C、70 °C 和 85 °C 下。与 BGM 从两个表面都暴露于溶液的双面浸入测试相比，该设备更接近地模拟 BGM 在现场的化学暴露条件。检查 BGM 的机械、流变和化学特性，以评估 BGM 组件相对于双面浸入实验的降解情况。虽然 BGM 的单面老化降低了 BGM 机械性能的退化率，但相对于双面暴露，它并不影响沥青涂层的退化率。此外，与暴露于采矿溶液中相比，BGM 暴露于城市固体废弃物渗滤液中导致其机械性能更快退化，但沥青涂层的降解速度更慢。然而，使用阿伦尼乌斯模型在不同温度下建立的 BGM 名义失效时间的预测表明，温度对 BGM 耐久性的影响比所考虑解决方案的化学影响更显着。