Water-entry pressure and friction angle in an artificially synthesized water-repellent silty soil

Changho Lee, Heui Jean Yang, Tae Sup Yun, Youngmin Choi, Seongyeong Yang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Water-repellent soils possess unique hydraulic and mechanical behaviours 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 waterdroplet 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.

Original languageEnglish
JournalVadose Zone Journal
Volume14
Issue number4
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

water repellent soils
silty soils
silty soil
friction
water
porosity
fluid mechanics
wettability
penetration
repellents
saturation
hydraulics
wetting
soil

All Science Journal Classification (ASJC) codes

  • Soil Science

Cite this

Lee, Changho ; Yang, Heui Jean ; Yun, Tae Sup ; Choi, Youngmin ; Yang, Seongyeong. / Water-entry pressure and friction angle in an artificially synthesized water-repellent silty soil. In: Vadose Zone Journal. 2015 ; Vol. 14, No. 4.
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Water-entry pressure and friction angle in an artificially synthesized water-repellent silty soil. / Lee, Changho; Yang, Heui Jean; Yun, Tae Sup; Choi, Youngmin; Yang, Seongyeong.

In: Vadose Zone Journal, Vol. 14, No. 4, 01.01.2015.

Research output: Contribution to journalArticle

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