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Evaluation of desiccation cracking characteristics of inorganic micro-fiber-reinforced engineered barrier material (IMEBM) for geological repository.

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Title: Evaluation of desiccation cracking characteristics of inorganic micro-fiber-reinforced engineered barrier material (IMEBM) for geological repository.
Authors: Feng, Yuan1 (AUTHOR) yfeng6@umd.edu, Kim, Seunghee2 (AUTHOR) seunghee.kim@unl.edu, Kim, Yong-Rak3 (AUTHOR) yong-rak.kim@tamu.edu, Dzenis, Yuris4 (AUTHOR) yurisdzenis@unl.edu, Eun, Jongwan1 (AUTHOR) jeun1@umd.edu
Source: Acta Geotechnica. Aug2025, Vol. 20 Issue 8, p4147-4165. 19p.
Subjects: Bentonite, Permeability, X-ray computed microtomography, Sealing (Technology), Inorganic fibers, Fibrous composites, Rock deformation, Geological repositories
Abstract: Buffer material is crucial for the engineering barrier system to dispose of high-level radioactive waste in a geological repository. A reliable buffer material should be able to maintain good sealing characteristics and minimize desiccation cracking. In this study, the effectiveness of inorganic fiber-reinforced engineering barrier material in reducing desiccation cracks in bentonite was evaluated via desiccation tests, image analysis, and air permeability tests. The effects of fiber type (E-glass fiber and basalt fiber) and fiber content (0.0%, 0.5%, 1.0%, 1.5%, 3.0%, and 5.0% of dry weight of the bentonite) on the development of desiccation cracks in the fiber–bentonite mixtures with the same given initial moisture content were evaluated. The results indicated that the addition of fibers could significantly reduce the crack size and area in bentonite during the drying. Basalt fibers showed a slightly better reinforcement effect than E-glass fibers when the fiber content was lower than 3.0%. The addition of fibers prevented the development of penetrating cracks and significantly reduced the permeability of the bentonite after drying. The permeabilities of basalt fiber- and E-glass fiber-reinforced bentonite composites with 3% reinforcement were 5.81 × 10–11 m2 and 7.24 × 10–11 m2, respectively, which were 64 and 51 times smaller than that of pure bentonite. X-ray–CT observation of the internal structure of the samples after drying showed that the addition of fibers significantly changed the crack morphology and potentially increased the tortuosity. [ABSTRACT FROM AUTHOR]
Copyright of Acta Geotechnica is the property of Springer Nature 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.)
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  Data: Evaluation of desiccation cracking characteristics of inorganic micro-fiber-reinforced engineered barrier material (IMEBM) for geological repository.
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  Data: <searchLink fieldCode="AR" term="%22Feng%2C+Yuan%22">Feng, Yuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yfeng6@umd.edu</i><br /><searchLink fieldCode="AR" term="%22Kim%2C+Seunghee%22">Kim, Seunghee</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> seunghee.kim@unl.edu</i><br /><searchLink fieldCode="AR" term="%22Kim%2C+Yong-Rak%22">Kim, Yong-Rak</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> yong-rak.kim@tamu.edu</i><br /><searchLink fieldCode="AR" term="%22Dzenis%2C+Yuris%22">Dzenis, Yuris</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> yurisdzenis@unl.edu</i><br /><searchLink fieldCode="AR" term="%22Eun%2C+Jongwan%22">Eun, Jongwan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jeun1@umd.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Acta+Geotechnica%22">Acta Geotechnica</searchLink>. Aug2025, Vol. 20 Issue 8, p4147-4165. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink><br /><searchLink fieldCode="DE" term="%22Permeability%22">Permeability</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+computed+microtomography%22">X-ray computed microtomography</searchLink><br /><searchLink fieldCode="DE" term="%22Sealing+%28Technology%29%22">Sealing (Technology)</searchLink><br /><searchLink fieldCode="DE" term="%22Inorganic+fibers%22">Inorganic fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Fibrous+composites%22">Fibrous composites</searchLink><br /><searchLink fieldCode="DE" term="%22Rock+deformation%22">Rock deformation</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+repositories%22">Geological repositories</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Buffer material is crucial for the engineering barrier system to dispose of high-level radioactive waste in a geological repository. A reliable buffer material should be able to maintain good sealing characteristics and minimize desiccation cracking. In this study, the effectiveness of inorganic fiber-reinforced engineering barrier material in reducing desiccation cracks in bentonite was evaluated via desiccation tests, image analysis, and air permeability tests. The effects of fiber type (E-glass fiber and basalt fiber) and fiber content (0.0%, 0.5%, 1.0%, 1.5%, 3.0%, and 5.0% of dry weight of the bentonite) on the development of desiccation cracks in the fiber–bentonite mixtures with the same given initial moisture content were evaluated. The results indicated that the addition of fibers could significantly reduce the crack size and area in bentonite during the drying. Basalt fibers showed a slightly better reinforcement effect than E-glass fibers when the fiber content was lower than 3.0%. The addition of fibers prevented the development of penetrating cracks and significantly reduced the permeability of the bentonite after drying. The permeabilities of basalt fiber- and E-glass fiber-reinforced bentonite composites with 3% reinforcement were 5.81 × 10–11 m2 and 7.24 × 10–11 m2, respectively, which were 64 and 51 times smaller than that of pure bentonite. X-ray–CT observation of the internal structure of the samples after drying showed that the addition of fibers significantly changed the crack morphology and potentially increased the tortuosity. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature 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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        Value: 10.1007/s11440-025-02627-6
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        Text: English
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      – SubjectFull: Permeability
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      – SubjectFull: X-ray computed microtomography
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      – SubjectFull: Inorganic fibers
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      – SubjectFull: Fibrous composites
        Type: general
      – SubjectFull: Rock deformation
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      – SubjectFull: Geological repositories
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      – TitleFull: Evaluation of desiccation cracking characteristics of inorganic micro-fiber-reinforced engineered barrier material (IMEBM) for geological repository.
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              Text: Aug2025
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