Establishing selection criteria of water repellent sandy soils for use in impervious layer of engineered slope
Establishing selection criteria of water repellent sandy soils for use in impervious layer of engineered slope
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DOI：
10.1016/j.conbuildmat.2021.123551
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发表时间：
2021-07
影响因子：
7.4
通讯作者：
Byeong-Su Kim;Daoju Ren;Seong-Wan Park;S. Kato
中科院分区：
文献类型：
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作者：
Byeong-Su Kim;Daoju Ren;Seong-Wan Park;S. Kato
在这项研究中，研究了用于工程斜坡防渗层的憎水砂土的选择标准。首先，通过硅烷处理对六种砂土进行疏水化处理。进行了评估疏水性和阻水性能的实验室实验，即水滴渗透时间（WDPT）测试、接触角测量测试和水渗透头（WIH）测试。根据所需的防水土厚度和所需的颗粒数，确定了达到合格防水性能的沙土的平均粒径。结果发现，小于 1.0 的 aCc 值或小于 2.0 毫米的 D40 值可以在沙土中提供良好的隔水性能。最后，一些测量的 WIH 值与毛细管上升模型估计的结果一致，并讨论了颗粒尺寸在该模型中的应用。
In this study, the selection criteria of water-repellent sandy soils for use in the impervious layer of engineered slopes were examined. First, the hydrophobization of six kinds of sandy soils was performed via the silane treatment. Laboratory experiments to assess hydrophobicity and water-shielding performance—namely the water drop penetration time (WDPT) test, the contact-angle measurement test, and the water infiltration head (WIH) test—were conducted. Based on the required thickness and the required particle number of water-repellent soils, the mean particle sizes of sandy soils that achieved acceptable water-shielding performance were determined. It was found that aCcvalue of less than 1.0 or aD40value of less than 2.0 mm allowed good water-shielding performance in sandy soils. Lastly, some of the measured WIH values agreed with the results estimated by the capillary rise model, and the application of the particle size to this model was discussed.