Thermal and electrical properties of water-repellent sands

Daehyun Kim, Taesup Yun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The behavior of water-repellent soils has been less concerned in spite of the importance of engineering significance compared to the other characteristics of soils. In general, the surface property of soils in natural state is recognized as easy to wet and this concept has been applied to unsaturated soil mechanics. However, there are also water-repellent soils (hydrophobic) generated naturally or produced artificially. The thermal and electrical conductivity are typical indices to assess physical behavior of materials associated with surface wettability. This research presents thermal and electrical properties of wettable and water-repellent sands in unsaturated condition. The wettable sands are in its natural state and the water-repellent sands are chemically treated using organic silane. The microscopic observation using the scanning electron microscopic and the atomic force microscopic images confirms the existence of homogeneously grafted organic materials on the silicate mineral surface. Prepared materials are used in the thermal and electrical experimentations with varying degree of saturation. The transient plane source is used for the measurement of the thermal conductivity. The two-electrode system is selected in the electrical conductivity measurement. The surface wettability that affects the spatial distribution of water in pore space causes the noticeable difference of thermal and electrical properties in two materials.

Original languageEnglish
Title of host publicationGeoCongress 2012
Subtitle of host publicationState of the Art and Practice in Geotechnical Engineering
Pages2522-2531
Number of pages10
Edition225 GSP
DOIs
Publication statusPublished - 2012 Dec 1
EventGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering - Oakland, CA, United States
Duration: 2012 Mar 252012 Mar 29

Publication series

NameGeotechnical Special Publication
Number225 GSP
ISSN (Print)0895-0563

Other

OtherGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
CountryUnited States
CityOakland, CA
Period12/3/2512/3/29

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Kim, D., & Yun, T. (2012). Thermal and electrical properties of water-repellent sands. In GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering (225 GSP ed., pp. 2522-2531). (Geotechnical Special Publication; No. 225 GSP). https://doi.org/10.1061/9780784412121.258