Chemically Induced Water Repellency and the Freeze-Thaw Durability of Soils
Chemically Induced Water Repellency and the Freeze-Thaw Durability of Soils
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DOI：
10.1061/(asce)cr.1943-5495.0000223
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发表时间：
2020-09-01
影响因子：
2
通讯作者：
Daniels, John L.
中科院分区：
文献类型：
--
作者：
Mahedi, Masrur;Satvati, Sajjad;Daniels, John L.
有机硅烷(OS)是一种硅基偶联剂，能够在土壤中产生疏水性。本研究评估了OS在减少冻融对路基土体影响方面的适用性。用两种不同剂量(50%和100%)的10%OS溶液对霜冻敏感土壤进行处理。经过OS处理的土壤被干燥，并以2.5和5 cm的厚度加入到自然土壤中。然后从最大冻胀、冻胀速率、土壤水分分布和温度分布等方面对天然土壤和添加OS的土壤的冻融性能进行了评价。经OS处理的土层冻胀降低48%~74%。未处理土壤的隆起速率为13.8 cm/d，加入5 cm厚的50%OS处理的土壤，其隆起速率降低到4 mm/d。与5 cm-100%OS处理层相比，5 cm-50%OS处理层更能有效地改善土壤的冻融性能。
Organosilane (OS) is a silicon-based coupling agent capable of producing hydrophobicity in soils. This study evaluated the applicability of OS in reducing the freeze-thaw impacts on subgrade soils. A frost-susceptible soil was treated with two different dosages (50% and 100% by weight) of 10% OS solution. The OS-treated soils were dried and incorporated into natural soil as layers of 2.5 and 5 cm thickness. The freeze-thaw performances of natural and OS-incorporated soils were then evaluated in terms of maximum frost heave, heave rate, soil moisture distribution, and temperature profile. The OS-treated soil layers decreased frost heaving by 48%-74%. The heave rate of untreated soil was 13.8 cm/day, which was decreased to 4 mm/day with an incorporation of 5 cm-thick layer of 50% OS-treated soil. A 5 cm-50% OS-treated layer was found to be more efficient compared to a 5 cm-100% OS-treated layer in improving the freeze-thaw performance of the soils.