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Open AccessArticle

Engineering Characteristics of Chemically Treated Water-Repellent Kaolin

School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841, Korea
School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Korea
Department of Marine and Civil Engineering, Chonnam National University, Yeosu 59626, Korea
Author to whom correspondence should be addressed.
Academic Editor: Luyi Sun
Materials 2016, 9(12), 978;
Received: 28 October 2016 / Revised: 20 November 2016 / Accepted: 29 November 2016 / Published: 2 December 2016
(This article belongs to the Section Advanced Composites)
Water-repellent soils have a potential as alternative construction materials that will improve conventional geotechnical structures. In this study, the potential of chemically treated water-repellent kaolin clay as a landfill cover material is explored by examining its characteristics including hydraulic and mechanical properties. In order to provide water repellency to the kaolin clay, the surface of clay particle is modified with organosilanes in concentrations (CO) ranging from 0.5% to 10% by weight. As the CO increases, the specific gravity of treated clay tends to decrease, whereas the total organic carbon content of the treated clay tends to increase. The soil-water contact angle increases with an increase in CO until CO = 2.5%, and then maintains an almost constant value (≈134.0°). Resistance to water infiltration is improved by organosilane treatment under low hydrostatic pressure. However, water infiltration resistance under high hydrostatic pressure is reduced or exacerbated to the level of untreated clay. The maximum compacted dry weight density decreases with increasing CO. As the CO increases, the small strain shear modulus increases, whereas the effect of organosilane treatment on the constrained modulus is minimal. The results indicate that water-repellent kaolin clay possesses excellent engineering characteristics for a landfill cover material. View Full-Text
Keywords: artificial water-repellent clay; contact angle; landfill cover system; organosilane; stiffness; water infiltration artificial water-repellent clay; contact angle; landfill cover system; organosilane; stiffness; water infiltration
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MDPI and ACS Style

Choi, Y.; Choo, H.; Yun, T.S.; Lee, C.; Lee, W. Engineering Characteristics of Chemically Treated Water-Repellent Kaolin. Materials 2016, 9, 978.

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