Imparting water repellency in completely decomposed granite with Tung oil
Imparting water repellency in completely decomposed granite with Tung oil
复制标题
用桐油赋予完全风化花岗岩防水性
DOI：
10.1016/j.jclepro.2019.05.032
复制
发表时间：
2019
影响因子：
11.1
通讯作者：
Lin H
中科院分区：
文献类型：
--
作者：
Lin H
工程防渗土作为防渗墙的建筑材料具有很大的潜力。通过调整土壤的防水性，可以建造不透水或半透水的防渗屏障，以适应各种工程应用，例如含水的不透水材料或允许植物生长的半透水材料。工业粘土、土工合成材料和灌浆都是经过验证的解决方案，经常用于类似的应用。为了提供可持续和低成本的解决方案来创造工程防水土壤，这项研究探索了中国传统植物油桐油对香港一块完全分解的花岗岩(CDG)的影响。桐油已经被用于历史建筑，并被建议作为混凝土的自愈剂。将来自香港的天然可湿性土壤CDG与桐油混合，在不同温度下加热不同时间。结果表明，桐油的存在会随着加热而产生严重且持久的拒水性，直到达到临界温度阈值和加热持续时间时，才会增强拒水性。然而，由于桐油与土壤的混合，也观察到由于团聚体而引起的土壤物理结构的变化。新形成的桐油浸渍聚集体(1)在水中浸泡时稳定，不受温度和加热时间的影响，(2)随着聚集体尺寸增加到温度阈值，抗拉强度增加。基于这些发现，桐油不仅可以通过简单的程序(通过土壤和油的混合)在自然土壤中诱导出高而持久的排水性，而且聚集物还可以为其他地面应用提供机会，包括改善坡面侵蚀。
Engineered water repellent soils have great potential as construction materials for seepage barriers. By adjusting the water repellency of the soil, an impermeable or semi-permeable seepage barrier can be constructed to suit various engineering applications, such as impervious materials to contain water or semi-permeable materials to allow vegetation growth. Industrial clays, geosynthetics and grouting are proven solutions frequently used for similar applications. To provide a sustainable and low-cost solution to create an engineered water repellent soil, this study explored how Tung oil, a Chinese traditional vegetation oil, affected a Hong Kong completely decomposed granite (CDG). Tung oil has already been used in historical structures and suggested as a self-healing agent for concrete. A natural wettable soil from Hong Kong, CDG, was mixed with Tung oil and heated at different temperatures for different durations. The results reveal that the presence of Tung oil developed severe and persistent water repellency with heating, enhancing water repellency until a critical temperature threshold and heating duration was reached. However, a change to soil physical structure due to aggregation was also observed due to the mixing of the Tung oil with the soil. The newly formed Tung-oil impregnated aggregates were found to be (1) stable when immersed in water, regardless of the temperature and heating duration, (2) and to have increasing tensile strength with aggregate size up to a temperature threshold. Based on these findings, not only can Tung oil induce high and persistent water repellency in a natural soil through simple procedures (by mixing of soil with oil), but also aggregation may offer the opportunity to improve soils for other ground applications including to ameliorate erosion on slopes.
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