Wettability of crushed air-dried minerals
Wettability of crushed air-dried minerals
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DOI：
10.1680/jgele.15.00075
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发表时间：
2015-09-01
影响因子：
2.1
通讯作者：
Saulick, Y.
中科院分区：
文献类型：
--
作者：
Lourenco, S. D. N.;Woche, S. K.;Saulick, Y.
土壤颗粒润湿性的重要性已在采矿工程、土壤科学和地貌学中得到认可，但在岩土工程中的程度较低，这可能是由于假设土壤或一般最常见的矿物总是可润湿的。从土壤科学和地貌学文献来看，已知土壤润湿性的变化会影响土壤过程，如渗透、侵蚀和野火后的泥石流。有机质是影响天然土壤润湿性的重要因素之一。然而，其产状非常浅，通常比岩土工程过程的关注深度更浅。因此，确定矿物的润湿性变得至关重要，特别是因为它可能与涉及土壤颗粒破碎或磨损的过程有关。本文探讨了21种常见的，新鲜粉碎的矿物（硫化物，氧化物和硅酸盐）的润湿性通过接触角与座滴法和威廉板法，包括颗粒属性，如纵横比和球形测量润湿性。结果显示，未涂覆的矿物具有广泛的接触角，硫化物显示出强烈的拒水行为，硅酸盐保持非常稳定。较高的接触角与聚集成球形的矿物颗粒以及具有较大纵横比的矿物颗粒相关。
The importance of soil particle wettability has been recognised in mining engineering, soil science and geomorphology but to a lesser extent in geotechnical engineering, perhaps due to the assumption that soils, or in general most common minerals, are always wettable. From the soil science and geomorphology literature, changes in soil wettability are known to influence soil processes such as infiltration, erosion and post-wildfire debris flows. Organic matter has been identified as one of the most important factors controlling the wettability of natural soils. However, its occurrence is very shallow and often shallower than the depth of interest for geotechnical processes. Therefore, it becomes essential to determine the wettability of minerals, in particular because it can be linked to processes that involve crushing or abrasion of soil particles. This paper examines the wettability of 21 common, freshly crushed minerals (sulfides, oxides and silicates) by measuring wettability via contact angles with the sessile drop method and the Wilhelmy plate method, including particle attributes such as aspect ratio and sphericity. The results revealed a wide range of contact angles for the uncoated minerals, with the sulfides showing strong water-repellent behaviour and the silicates remaining very wettable. Higher contact angles are associated with mineral particles that converge to the shape of a sphere and for those that have a larger aspect ratio.