Thermal and electrical response of unsaturated hydrophilic and hydrophobic granular materials

Dae Hyun Kim, Young Jin Kim, Jong-Sub Lee, Tae Sup Yun

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The thermal and electrical properties of unsaturated soils have been less investigated, compared with geomechanical characteristics, despite the wide range of engineering implications. Moreover, the wettability of soil surface commonly accepted in unsaturated soil mechanics is often assumed to be wettable, whereas water-repellent (hydrophobic) soils can exist in natural systems. This study presents the synthesizing method of water-repellent soils and experimental procedure to evaluate the evolution of thermal and electrical properties of unsaturated wettable (hydrophilic) and water-repellent (hydrophobic) soils. Sands are chemically treated with an organic silane to make the particle surface water-repellent. The transient plane source method is used to obtain the thermal conductivity of both hydrophilic and hydrophobic specimens. The electrical conductance is measured by the two-electrode system as well. The degree of saturation varies for both experimentations to assess the surface wettability effect that is captured by thermal and electrical conduction. The different capillarity, driven by surface wettability of soils and corresponding spatial distribution of water phase in pore space, influences thermal and electrical properties for tested specimens. The synthesis of hydrophobic soils in conjunction with simple experimental techniques enables one to evaluate physical properties of unsaturated soils at the particle-scale.

Original languageEnglish
JournalGeotechnical Testing Journal
Volume34
Issue number5
DOIs
Publication statusPublished - 2011 Sep 1

Fingerprint

Granular materials
Soils
electrical property
wettability
soil
Wetting
Electric properties
Thermodynamic properties
Water
capillarity
water
soil mechanics
Soil mechanics
pore space
Hot Temperature
material
thermal conductivity
Capillarity
Silanes
Surface waters

Keywords

  • Electrical conductance
  • Hydrophobic soil
  • Surface wettability
  • Thermal conductivity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Thermal and electrical response of unsaturated hydrophilic and hydrophobic granular materials. / Kim, Dae Hyun; Kim, Young Jin; Lee, Jong-Sub; Yun, Tae Sup.

In: Geotechnical Testing Journal, Vol. 34, No. 5, 01.09.2011.

Research output: Contribution to journalArticle

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