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Experimental study on the direct shear strength characteristics of silt treated with Xanthan gum under different drying and wetting paths.

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Title: Experimental study on the direct shear strength characteristics of silt treated with Xanthan gum under different drying and wetting paths.
Authors: Zhang, Junran1 (AUTHOR) zhangjunran@ncwu.edu.cn, Yan, Hongchen1 (AUTHOR), Meng, Zhihao1 (AUTHOR), Liu, Yang1 (AUTHOR), Sun, De'an1,2 (AUTHOR) sundean@shu.edu.cn
Source: Construction & Building Materials. Mar2024, Vol. 418, pN.PAG-N.PAG. 1p.
Subjects: Xanthan gum, Silt, Floodplains, Scanning electron microscopes, Wetting, Shear strength
Geographic Terms: China
Abstract: The silt deposited in the Yellow River floodplains in China is weak and widely dispersed. In engineering practice, chemically modified agents such as lime and fly ash are frequently employed to enhance the hydro-mechanical behaviour of soils, which however generates significant amounts of CO 2. As an environmentally friendly soil improvement material, Xanthan gum has broad application prospects and is therefore being considered as a solidified material to improve silty soil, which meets the national strategy requirements of ecological protection and high-quality development in the Yellow River Basin. In this study, scanning electron microscope, WP4C apparatus, and an automatic direct shear test system were used to perform several microscopic, water-retention behaviour, and direct shear tests on Xanthan gum-treated silt in drying and wetting paths. According to test results, the differences in shear strength behavior were observed in drying and wetting paths. The average skeleton stress of untreated silt in the drying path is greater than that in the wetting path due to the hysteresis effect, and thus the shear strength in the drying path is higher than that in the wetting path. Xanthan gum-treated silt specimens in the wetting path first were cured at a relative humidity of 47% and temperature of 24°C for seven days, and then were wetted to different water contents. The microstructure of the Xanthan gum-treated silt in the wetting path became firmer, and thus the shear strength was higher than that in the drying path. There is also the hysteretic effect of Xanthan gum-treated silt. However, the curing age is the most important factor affecting this phenomenon. Our findings can serve as a scientific foundation for designing, constructing, and maintaining relevant geotechnical structures in the Yellow River flooded area. • The microstructure of Xanthan-treated silt is firmer than that of untreated silt. • Water retention characteristics of Xanthan-treated silt was obtained in wide suction range. • Shear strength of treated silt in drying and wetting paths was studied quantitatively. • Shear strength of untreated silt in drying path is higher than that in wetting path. • Shear strength of treated silt in wetting path is higher than that in drying path. [ABSTRACT FROM AUTHOR]
Copyright of Construction & Building Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 175641421
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Experimental study on the direct shear strength characteristics of silt treated with Xanthan gum under different drying and wetting paths.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Junran%22">Zhang, Junran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhangjunran@ncwu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yan%2C+Hongchen%22">Yan, Hongchen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meng%2C+Zhihao%22">Meng, Zhihao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yang%22">Liu, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+De'an%22">Sun, De'an</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> sundean@shu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Construction+%26+Building+Materials%22">Construction & Building Materials</searchLink>. Mar2024, Vol. 418, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Xanthan+gum%22">Xanthan gum</searchLink><br /><searchLink fieldCode="DE" term="%22Silt%22">Silt</searchLink><br /><searchLink fieldCode="DE" term="%22Floodplains%22">Floodplains</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopes%22">Scanning electron microscopes</searchLink><br /><searchLink fieldCode="DE" term="%22Wetting%22">Wetting</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+strength%22">Shear strength</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22China%22">China</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The silt deposited in the Yellow River floodplains in China is weak and widely dispersed. In engineering practice, chemically modified agents such as lime and fly ash are frequently employed to enhance the hydro-mechanical behaviour of soils, which however generates significant amounts of CO 2. As an environmentally friendly soil improvement material, Xanthan gum has broad application prospects and is therefore being considered as a solidified material to improve silty soil, which meets the national strategy requirements of ecological protection and high-quality development in the Yellow River Basin. In this study, scanning electron microscope, WP4C apparatus, and an automatic direct shear test system were used to perform several microscopic, water-retention behaviour, and direct shear tests on Xanthan gum-treated silt in drying and wetting paths. According to test results, the differences in shear strength behavior were observed in drying and wetting paths. The average skeleton stress of untreated silt in the drying path is greater than that in the wetting path due to the hysteresis effect, and thus the shear strength in the drying path is higher than that in the wetting path. Xanthan gum-treated silt specimens in the wetting path first were cured at a relative humidity of 47% and temperature of 24°C for seven days, and then were wetted to different water contents. The microstructure of the Xanthan gum-treated silt in the wetting path became firmer, and thus the shear strength was higher than that in the drying path. There is also the hysteretic effect of Xanthan gum-treated silt. However, the curing age is the most important factor affecting this phenomenon. Our findings can serve as a scientific foundation for designing, constructing, and maintaining relevant geotechnical structures in the Yellow River flooded area. • The microstructure of Xanthan-treated silt is firmer than that of untreated silt. • Water retention characteristics of Xanthan-treated silt was obtained in wide suction range. • Shear strength of treated silt in drying and wetting paths was studied quantitatively. • Shear strength of untreated silt in drying path is higher than that in wetting path. • Shear strength of treated silt in wetting path is higher than that in drying path. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Construction & Building Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.conbuildmat.2024.135457
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Xanthan gum
        Type: general
      – SubjectFull: Silt
        Type: general
      – SubjectFull: Floodplains
        Type: general
      – SubjectFull: Scanning electron microscopes
        Type: general
      – SubjectFull: Wetting
        Type: general
      – SubjectFull: Shear strength
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: Experimental study on the direct shear strength characteristics of silt treated with Xanthan gum under different drying and wetting paths.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Zhang, Junran
      – PersonEntity:
          Name:
            NameFull: Yan, Hongchen
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            NameFull: Meng, Zhihao
      – PersonEntity:
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            NameFull: Liu, Yang
      – PersonEntity:
          Name:
            NameFull: Sun, De'an
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          Dates:
            – D: 08
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 09500618
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            – Type: volume
              Value: 418
          Titles:
            – TitleFull: Construction & Building Materials
              Type: main
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