Characterization of freeze–thaw effects within clay by 3D X-ray Computed Tomography

Accurate quantification of moisture content redistribution and physical property change due to freeze–thaw is important for understanding frost heave and thaw settlement of fine-grained soils including clay. This paper presents 3D X-ray Computed Tomography (CT) data for a clay specimen before and af...

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Published inCold regions science and technology Vol. 148; pp. 13 - 21
Main Authors Wang, Shengfu, Yang, Ping, Yang, Zhaohui (Joey)
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2018
Subjects
Online AccessGet full text
ISSN0165-232X
1872-7441
DOI10.1016/j.coldregions.2018.01.001

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Abstract Accurate quantification of moisture content redistribution and physical property change due to freeze–thaw is important for understanding frost heave and thaw settlement of fine-grained soils including clay. This paper presents 3D X-ray Computed Tomography (CT) data for a clay specimen before and after freeze–thaw and physical property data obtained by conventional laboratory testing, and the relationship among the date sets. Undisturbed clay specimens were subject to one-directional freeze–thaw in a closed system under different freezing temperatures to collect 3D X-ray CT images, and the variation in CT image intensity (CTI) before and after freeze–thaw were analyzed to reveal the spatial effects of freeze–thaw. Meanwhile, soil properties including moisture content, void ratio, and dry density were obtained for samples taken from different heights of the specimens with and without freeze–thaw to obtain their changes. Close correlations were observed between the physical property changes and the CTI variation. Linear equations were established between the changes of physical properties and the CTI variation. These equations could potentially be applied for high-resolution quantitative assessment of soil physical property changes due to freeze–thaw by using 3D X-ray CT. This study demonstrates that, compared with traditional test methods, CT scanning can be advantageous in revealing the internal change in soil physical properties due to freeze–thaw quantitatively and nondestructively. •Proposed procedures for correcting the cupping and end effects•3D X-ray CT effective in revealing spatial structural change within clay•Close correlation between changes in CT intensity and physical properties•Establish linear equations for high resolution quantitative assessment of physical properties
AbstractList Accurate quantification of moisture content redistribution and physical property change due to freeze–thaw is important for understanding frost heave and thaw settlement of fine-grained soils including clay. This paper presents 3D X-ray Computed Tomography (CT) data for a clay specimen before and after freeze–thaw and physical property data obtained by conventional laboratory testing, and the relationship among the date sets. Undisturbed clay specimens were subject to one-directional freeze–thaw in a closed system under different freezing temperatures to collect 3D X-ray CT images, and the variation in CT image intensity (CTI) before and after freeze–thaw were analyzed to reveal the spatial effects of freeze–thaw. Meanwhile, soil properties including moisture content, void ratio, and dry density were obtained for samples taken from different heights of the specimens with and without freeze–thaw to obtain their changes. Close correlations were observed between the physical property changes and the CTI variation. Linear equations were established between the changes of physical properties and the CTI variation. These equations could potentially be applied for high-resolution quantitative assessment of soil physical property changes due to freeze–thaw by using 3D X-ray CT. This study demonstrates that, compared with traditional test methods, CT scanning can be advantageous in revealing the internal change in soil physical properties due to freeze–thaw quantitatively and nondestructively. •Proposed procedures for correcting the cupping and end effects•3D X-ray CT effective in revealing spatial structural change within clay•Close correlation between changes in CT intensity and physical properties•Establish linear equations for high resolution quantitative assessment of physical properties
Author Yang, Ping
Wang, Shengfu
Yang, Zhaohui (Joey)
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  email: zyang2@alaska.edu
  organization: Dept. of Civil Engineering, University of Alaska, Anchorage, AK 99508, USA
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Keywords Freeze–thaw effect
Clay
Three-dimensional X-ray Computed Tomography
Moisture migration
Language English
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Snippet Accurate quantification of moisture content redistribution and physical property change due to freeze–thaw is important for understanding frost heave and thaw...
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StartPage 13
SubjectTerms Clay
Freeze–thaw effect
Moisture migration
Three-dimensional X-ray Computed Tomography
Title Characterization of freeze–thaw effects within clay by 3D X-ray Computed Tomography
URI https://dx.doi.org/10.1016/j.coldregions.2018.01.001
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