Mechanical behavior of GMZ bentonite pellet mixtures over a wide suction range.
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| Title: | Mechanical behavior of GMZ bentonite pellet mixtures over a wide suction range. |
|---|---|
| Authors: | Zhang, Zhao1 (AUTHOR), Ye, Wei-Min1,2 (AUTHOR) ye_tju@tongji.edu.cn, Liu, Zhang-Rong1 (AUTHOR), Wang, Qiong1,2 (AUTHOR), Cui, Yu-Jun1,3 (AUTHOR) |
| Source: | Engineering Geology. Jan2020, Vol. 264, pN.PAG-N.PAG. 1p. |
| Subjects: | Radioactive waste repositories, Geological repositories, Pelletizing, Systems engineering, Water transfer |
| Abstract: | • High-density GMZ bentonite pellets were firstly manufactured and bentonite pellet mixtures were prepared. • Swelling pressure tests, swelling deformation tests and compression tests were conducted with suction control. • Three stages could be identified on the evolution curves of swelling pressure with suction. • The rebound curves of the compression test presented a linear relationship in high and a bi-linear one in low suctions. • Swelling pressure determined by the constant-volume method was lower than that by the swell-consolidation method. High-density bentonite pellet mixtures have been proposed as candidate materials for filling technological voids in the deep geological disposal repository of high-level radioactive waste (HLW). Water vapour transfer plays a major role in the function formation of the unsaturated engineering barrier system, due to the existing high thermal gradients generated by the decay heat released from the canister. In this work, series of suction controlled swelling pressure tests, swelling deformation tests and compression tests were conducted on GMZ bentonite pellet mixtures. Results show that, for the specimen hydrated by the vapour equilibrium technique, no collapse was observed on the evolution curve of swelling pressure. However, for that wetted by the osmotic technique, a collapse of swelling pressure was observed after the first peak value. For specimens hydrated with suction-control, a collapse on the evolution curve of swelling strain was only observed under high vertical stresses. In addition, the unloading curves of specimens exhibited a linearity at the high suction stage and a bi-linearity at the low suction stage. The swelling pressure determined by the swell-consolidation method was higher than that determined by the constant-volume method. [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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 141320116 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Mechanical behavior of GMZ bentonite pellet mixtures over a wide suction range. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Zhao%22">Zhang, Zhao</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>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cui%2C+Yu-Jun%22">Cui, Yu-Jun</searchLink><relatesTo>1,3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Engineering+Geology%22">Engineering Geology</searchLink>. Jan2020, Vol. 264, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Radioactive+waste+repositories%22">Radioactive waste repositories</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+repositories%22">Geological repositories</searchLink><br /><searchLink fieldCode="DE" term="%22Pelletizing%22">Pelletizing</searchLink><br /><searchLink fieldCode="DE" term="%22Systems+engineering%22">Systems engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Water+transfer%22">Water transfer</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: • High-density GMZ bentonite pellets were firstly manufactured and bentonite pellet mixtures were prepared. • Swelling pressure tests, swelling deformation tests and compression tests were conducted with suction control. • Three stages could be identified on the evolution curves of swelling pressure with suction. • The rebound curves of the compression test presented a linear relationship in high and a bi-linear one in low suctions. • Swelling pressure determined by the constant-volume method was lower than that by the swell-consolidation method. High-density bentonite pellet mixtures have been proposed as candidate materials for filling technological voids in the deep geological disposal repository of high-level radioactive waste (HLW). Water vapour transfer plays a major role in the function formation of the unsaturated engineering barrier system, due to the existing high thermal gradients generated by the decay heat released from the canister. In this work, series of suction controlled swelling pressure tests, swelling deformation tests and compression tests were conducted on GMZ bentonite pellet mixtures. Results show that, for the specimen hydrated by the vapour equilibrium technique, no collapse was observed on the evolution curve of swelling pressure. However, for that wetted by the osmotic technique, a collapse of swelling pressure was observed after the first peak value. For specimens hydrated with suction-control, a collapse on the evolution curve of swelling strain was only observed under high vertical stresses. In addition, the unloading curves of specimens exhibited a linearity at the high suction stage and a bi-linearity at the low suction stage. The swelling pressure determined by the swell-consolidation method was higher than that determined by the constant-volume method. [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.2019.105383 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Radioactive waste repositories Type: general – SubjectFull: Geological repositories Type: general – SubjectFull: Pelletizing Type: general – SubjectFull: Systems engineering Type: general – SubjectFull: Water transfer Type: general Titles: – TitleFull: Mechanical behavior of GMZ bentonite pellet mixtures over a wide suction range. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Zhao – PersonEntity: Name: NameFull: Ye, Wei-Min – PersonEntity: Name: NameFull: Liu, Zhang-Rong – PersonEntity: Name: NameFull: Wang, Qiong – PersonEntity: Name: NameFull: Cui, Yu-Jun IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 00137952 Numbering: – Type: volume Value: 264 Titles: – TitleFull: Engineering Geology Type: main |
| ResultId | 1 |
