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Extrusion behavior of bentonite-based materials considering pore size and sand content effects.

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Title: Extrusion behavior of bentonite-based materials considering pore size and sand content effects.
Authors: Xu, Li-Bo1 (AUTHOR), Ye, Wei-Min1,2 (AUTHOR) ye_tju@tongji.edu.cn, Liu, Zhang-Rong1 (AUTHOR), Wang, Qiong1 (AUTHOR), Chen, Yong-Gui1 (AUTHOR)
Source: Construction & Building Materials. Sep2022, Vol. 347, pN.PAG-N.PAG. 1p.
Subjects: Pore size (Materials), Sand, Extrusion process, Fracture mechanics, Diffusion coefficients
Abstract: • An extrusion model was developed and verified considering sidewall friction and sand content effects. • Sidewall friction factor increased with decreasing pore size and increasing sand content. • Sidewall friction or specimen mass loss plays dominant role in the extrusion, depending on pore size. • Diffusion coefficient of montmorillonite increased with increasing sand content. Extrusion of compacted bentonite or bentonite–sand materials into fractures and pores in the host-rock formations improves the buffering ability of the host-rock formations and simultaneously reduces the buffering capacity of the engineering barrier, and ultimately endangering the operation security and stability of the repository. In this work, a model was developed for describing extrusion of bentonite–sand mixture into pores considering pore size and sand content effects. Then, a test apparatus was designed and extrusion tests considering pore size and sand content effects were conducted. Images of the extrusion process were regularly captured and analyzed. Results show that according to the extrusion model, the diffusion coefficient increased with the increasing sand content. Moreover, the sidewall friction factor increased with decreasing pore size and increasing sand content. For samples tested with a sand content of 0, after 15 days test, the extrusion distance increased first and then decreased with increasing pore size. Moreover, the extrusion rate initially decreased with increasing sand content, while after about 42 days test, for tests conducted in a pore radius of 10 mm, the extrusion rate increased first and then decreased with increasing sand content. Finally, considering the influence of pore size on the anisotropy of swelling pressure, the model could well simulate extrusion tests with consideration of pore size and sand content effects. [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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Header DbId: egs
DbLabel: Engineering Source
An: 158443094
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Extrusion behavior of bentonite-based materials considering pore size and sand content effects.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Xu%2C+Li-Bo%22">Xu, Li-Bo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ye%2C+Wei-Min%22">Ye, Wei-Min</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> ye_tju@tongji.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Zhang-Rong%22">Liu, Zhang-Rong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Qiong%22">Wang, Qiong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Yong-Gui%22">Chen, Yong-Gui</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Construction+%26+Building+Materials%22">Construction & Building Materials</searchLink>. Sep2022, Vol. 347, pN.PAG-N.PAG. 1p.
– Name: Subject
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Pore+size+%28Materials%29%22">Pore size (Materials)</searchLink><br /><searchLink fieldCode="DE" term="%22Sand%22">Sand</searchLink><br /><searchLink fieldCode="DE" term="%22Extrusion+process%22">Extrusion process</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+mechanics%22">Fracture mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion+coefficients%22">Diffusion coefficients</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • An extrusion model was developed and verified considering sidewall friction and sand content effects. • Sidewall friction factor increased with decreasing pore size and increasing sand content. • Sidewall friction or specimen mass loss plays dominant role in the extrusion, depending on pore size. • Diffusion coefficient of montmorillonite increased with increasing sand content. Extrusion of compacted bentonite or bentonite–sand materials into fractures and pores in the host-rock formations improves the buffering ability of the host-rock formations and simultaneously reduces the buffering capacity of the engineering barrier, and ultimately endangering the operation security and stability of the repository. In this work, a model was developed for describing extrusion of bentonite–sand mixture into pores considering pore size and sand content effects. Then, a test apparatus was designed and extrusion tests considering pore size and sand content effects were conducted. Images of the extrusion process were regularly captured and analyzed. Results show that according to the extrusion model, the diffusion coefficient increased with the increasing sand content. Moreover, the sidewall friction factor increased with decreasing pore size and increasing sand content. For samples tested with a sand content of 0, after 15 days test, the extrusion distance increased first and then decreased with increasing pore size. Moreover, the extrusion rate initially decreased with increasing sand content, while after about 42 days test, for tests conducted in a pore radius of 10 mm, the extrusion rate increased first and then decreased with increasing sand content. Finally, considering the influence of pore size on the anisotropy of swelling pressure, the model could well simulate extrusion tests with consideration of pore size and sand content effects. [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.2022.128580
    Languages:
      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Pore size (Materials)
        Type: general
      – SubjectFull: Sand
        Type: general
      – SubjectFull: Extrusion process
        Type: general
      – SubjectFull: Fracture mechanics
        Type: general
      – SubjectFull: Diffusion coefficients
        Type: general
    Titles:
      – TitleFull: Extrusion behavior of bentonite-based materials considering pore size and sand content effects.
        Type: main
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            NameFull: Xu, Li-Bo
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            NameFull: Ye, Wei-Min
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            NameFull: Liu, Zhang-Rong
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            NameFull: Wang, Qiong
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            NameFull: Chen, Yong-Gui
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            – D: 12
              M: 09
              Text: Sep2022
              Type: published
              Y: 2022
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              Value: 347
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