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Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration

Investigation on swelling characteristics of buffer/backfill materials during hydration is an important issue in the design of artificial barriers in high-level radioactive waste (HLW) disposal repositories. In this work, for clarifying the characteristic of void ratio–suction relationship for compa...

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Detalles Bibliográficos
Autores principales: Wang, Yang, Teng, Jun, Huang, Qi, Wang, Wei, Ren, Zhenyang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9332360/
https://www.ncbi.nlm.nih.gov/pubmed/35897603
http://dx.doi.org/10.3390/ma15155173
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author Wang, Yang
Teng, Jun
Huang, Qi
Wang, Wei
Ren, Zhenyang
author_facet Wang, Yang
Teng, Jun
Huang, Qi
Wang, Wei
Ren, Zhenyang
author_sort Wang, Yang
collection PubMed
description Investigation on swelling characteristics of buffer/backfill materials during hydration is an important issue in the design of artificial barriers in high-level radioactive waste (HLW) disposal repositories. In this work, for clarifying the characteristic of void ratio–suction relationship for compacted bentonite on hydration path, suction-controlled swelling deformation tests under constant vertical stresses 0.001~40 MPa were carried out on compacted bentonite specimens. Four different types of void ratio-suction curves indicated that swelling-collapse behavior under hydration depends on suction and over-consolidation ratio (OCR), based on which the swelling index was defined. Then, equations were proposed for describing the swelling-collapse characteristic of void ratio–suction curves. Simulation results of suction-controlled swelling deformation tests show that the different types of the hydration deformation curves could be well described by the proposed equations. Obviously, the proposed equations could be used for description and prediction of swelling characteristics of compacted bentonite during hydration, which is also of great importance for the safety assessment of the HLW repositories.
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spelling pubmed-93323602022-07-29 Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration Wang, Yang Teng, Jun Huang, Qi Wang, Wei Ren, Zhenyang Materials (Basel) Article Investigation on swelling characteristics of buffer/backfill materials during hydration is an important issue in the design of artificial barriers in high-level radioactive waste (HLW) disposal repositories. In this work, for clarifying the characteristic of void ratio–suction relationship for compacted bentonite on hydration path, suction-controlled swelling deformation tests under constant vertical stresses 0.001~40 MPa were carried out on compacted bentonite specimens. Four different types of void ratio-suction curves indicated that swelling-collapse behavior under hydration depends on suction and over-consolidation ratio (OCR), based on which the swelling index was defined. Then, equations were proposed for describing the swelling-collapse characteristic of void ratio–suction curves. Simulation results of suction-controlled swelling deformation tests show that the different types of the hydration deformation curves could be well described by the proposed equations. Obviously, the proposed equations could be used for description and prediction of swelling characteristics of compacted bentonite during hydration, which is also of great importance for the safety assessment of the HLW repositories. MDPI 2022-07-26 /pmc/articles/PMC9332360/ /pubmed/35897603 http://dx.doi.org/10.3390/ma15155173 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Yang
Teng, Jun
Huang, Qi
Wang, Wei
Ren, Zhenyang
Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title_full Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title_fullStr Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title_full_unstemmed Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title_short Insight on the Void Ratio–Suction Relationship of Compacted Bentonite during Hydration
title_sort insight on the void ratio–suction relationship of compacted bentonite during hydration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9332360/
https://www.ncbi.nlm.nih.gov/pubmed/35897603
http://dx.doi.org/10.3390/ma15155173
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