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Water infiltration and swelling pressure development in GMZ bentonite pellet mixtures with consideration of temperature effects.

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Title: Water infiltration and swelling pressure development in GMZ bentonite pellet mixtures with consideration of temperature effects.
Authors: Liu, Zhang-Rong1 (AUTHOR), Ye, Wei-Min1,2 (AUTHOR) ye_tju@tongji.edu.cn, Cui, Yu-Jun3 (AUTHOR), Zhu, He-Hua1,2 (AUTHOR), Wang, Qiong1,2 (AUTHOR)
Source: Engineering Geology. Aug2022, Vol. 305, pN.PAG-N.PAG. 1p.
Subjects: Radioactive waste repositories, Swelling of materials, Temperature effect, Bentonite, Geological repositories, Soil moisture, Osmotic pressure
Abstract: Bentonite pellet mixture (BPM) is considered as a potential buffer/backfill material for geological repository of radioactive waste. Once emplaced in a repository, the initially discrete BPM with heterogeneous porosity would be subjected to groundwater infiltrated from surrounding rock and decay heat released from nuclides, leading to temperature depended processes of water infiltration and swelling pressure development. In this study, Gaomiaozi (GMZ) BPMs were hydrated with distilled water under constant volume condition at temperatures 20, 40, 60 and 80 °C. The water content profiles, dry density profiles and swelling pressure were periodically measured and recorded, respectively. Results indicate that, both water infiltration and swelling pressure development were accelerated by increasing temperature. Due to local swelling formation that brining water ahead and prevailing vapour diffusion through the large interconnected inter-pellet voids, the water infiltration through the BPM was anomalous super-diffusion at non-Boltzmann scale. Accordingly, a non-Boltzmann variable based water infiltration model was developed and verified by the experimental data. The non-Boltzmann variable was inversely related to water content, dry density and montmorillonite content, whereas positively related to temperature. It was proved to be able to qualitatively reflect the mobility of water for different unsaturated soils with different water contents. In addition, a comprehensive explanation of temperature effects on swelling pressure was put forward, stating that the variation of swelling pressure with temperature depended on the competitions among the thermal-induced responses of hydration pressure, water pressure and osmotic pressure. The competitions could be controlled by the clay mineralogy, pore water properties, electrolyte properties and the clay-water-electrolyte interactions at micro scale, and by dry density, thermal mode and drainage condition at macro scale. • Increasing temperature accelerated water infiltration and swelling pressure development. • Inter-pellet voids facilitate water infiltration and accommodate partially pellets swelling. • A non-Boltzmann variable based water infiltration model was developed and verified. • A comprehensive explanation of temperature effects on swelling pressure was put forward. [ABSTRACT FROM AUTHOR]
Copyright of Engineering Geology 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: 157352915
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PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Water infiltration and swelling pressure development in GMZ bentonite pellet mixtures with consideration of temperature effects.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Zhang-Rong%22">Liu, Zhang-Rong</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="%22Cui%2C+Yu-Jun%22">Cui, Yu-Jun</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhu%2C+He-Hua%22">Zhu, He-Hua</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Qiong%22">Wang, Qiong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Geology%22">Engineering Geology</searchLink>. Aug2022, Vol. 305, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Radioactive+waste+repositories%22">Radioactive waste repositories</searchLink><br /><searchLink fieldCode="DE" term="%22Swelling+of+materials%22">Swelling of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+repositories%22">Geological repositories</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+moisture%22">Soil moisture</searchLink><br /><searchLink fieldCode="DE" term="%22Osmotic+pressure%22">Osmotic pressure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Bentonite pellet mixture (BPM) is considered as a potential buffer/backfill material for geological repository of radioactive waste. Once emplaced in a repository, the initially discrete BPM with heterogeneous porosity would be subjected to groundwater infiltrated from surrounding rock and decay heat released from nuclides, leading to temperature depended processes of water infiltration and swelling pressure development. In this study, Gaomiaozi (GMZ) BPMs were hydrated with distilled water under constant volume condition at temperatures 20, 40, 60 and 80 °C. The water content profiles, dry density profiles and swelling pressure were periodically measured and recorded, respectively. Results indicate that, both water infiltration and swelling pressure development were accelerated by increasing temperature. Due to local swelling formation that brining water ahead and prevailing vapour diffusion through the large interconnected inter-pellet voids, the water infiltration through the BPM was anomalous super-diffusion at non-Boltzmann scale. Accordingly, a non-Boltzmann variable based water infiltration model was developed and verified by the experimental data. The non-Boltzmann variable was inversely related to water content, dry density and montmorillonite content, whereas positively related to temperature. It was proved to be able to qualitatively reflect the mobility of water for different unsaturated soils with different water contents. In addition, a comprehensive explanation of temperature effects on swelling pressure was put forward, stating that the variation of swelling pressure with temperature depended on the competitions among the thermal-induced responses of hydration pressure, water pressure and osmotic pressure. The competitions could be controlled by the clay mineralogy, pore water properties, electrolyte properties and the clay-water-electrolyte interactions at micro scale, and by dry density, thermal mode and drainage condition at macro scale. • Increasing temperature accelerated water infiltration and swelling pressure development. • Inter-pellet voids facilitate water infiltration and accommodate partially pellets swelling. • A non-Boltzmann variable based water infiltration model was developed and verified. • A comprehensive explanation of temperature effects on swelling pressure was put forward. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Engineering Geology 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.enggeo.2022.106718
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Radioactive waste repositories
        Type: general
      – SubjectFull: Swelling of materials
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Bentonite
        Type: general
      – SubjectFull: Geological repositories
        Type: general
      – SubjectFull: Soil moisture
        Type: general
      – SubjectFull: Osmotic pressure
        Type: general
    Titles:
      – TitleFull: Water infiltration and swelling pressure development in GMZ bentonite pellet mixtures with consideration of temperature effects.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Liu, Zhang-Rong
      – PersonEntity:
          Name:
            NameFull: Ye, Wei-Min
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            NameFull: Cui, Yu-Jun
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            NameFull: Zhu, He-Hua
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            NameFull: Wang, Qiong
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          Dates:
            – D: 01
              M: 08
              Text: Aug2022
              Type: published
              Y: 2022
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            – Type: issn-print
              Value: 00137952
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            – Type: volume
              Value: 305
          Titles:
            – TitleFull: Engineering Geology
              Type: main
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