4.5 Article

Water-Entry Pressure and Friction Angle in an Artificially Synthesized Water-Repellent Silty Soil

Journal

VADOSE ZONE JOURNAL
Volume 14, Issue 4, Pages -

Publisher

SOIL SCI SOC AMER
DOI: 10.2136/vzj2014.08.0106

Keywords

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Funding

  1. National Research Foundation of Korea (NRF)
  2. Korea CCS R&D Center (KCRC) - Korean government [2011-0030040, 2011-0022883, 2013035972]
  3. Regional Development Research Program - Ministry of Land, Infrastructure and Transport of the Korean government [14-RDRP-B076564-01]
  4. Samsung CT Corporation
  5. National Research Foundation of Korea [2011-0022883] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Water-repellent soils possess unique hydraulic and mechanical behaviors that confer large potential for their use in geotechnical applications because particle-scale surface-wettability characteristics significantly influence macroscale manifestations. This study examined the hydraulic and mechanical behavior of an artificially created water-repellent silty soil with four different concentrations of a reactive organo-silane solution. A series of laboratory tests was performed that included measurements of water-droplet penetration time (WDPT), water-entry pressure (WEP), flow rate, and friction angle. Experimental results showed that the artificial treatment produced a unique range of porosity values depending on the concentration and that the WDPT and WEP increased with decreasing porosity and increasing concentration. A gravimetric fraction of 40% water-repellent particles was sufficient for bulk soils to exhibit water repellency. The flow rate of specimens with a high concentration of reactive organo-silane tended to be high due to the resulting high degree of saturation on water permeation. In contrast, friction angles tended to decrease with increasing concentration of organo-silane solution under dry conditions and remained quasi-constant on wetting, regardless of the degree of saturation.

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