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Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration

Majid Sedighi, Hywel Thomas Orcid Logo, Philip J. Vardon

Journal of Geotechnical and Geoenvironmental Engineering, Volume: 144, Issue: 10, Start page: 04018075

Swansea University Author: Hywel Thomas Orcid Logo

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DOI (Published version): 10.1061/(asce)gt.1943-5606.0001955

Abstract

This paper presents an investigation of coupled thermal, hydraulic, and chemical behavior of a compacted bentonite buffer under the heating and hydration conditions of geological disposal of high-level nuclear waste. The study presented provides further insight into the evolution of hydro-geochemist...

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Published in: Journal of Geotechnical and Geoenvironmental Engineering
ISSN: 1090-0241 1943-5606
Published: American Society of Civil Engineers (ASCE) 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa52880
first_indexed 2019-11-26T13:15:41Z
last_indexed 2020-08-15T03:14:18Z
id cronfa52880
recordtype SURis
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spelling 2020-08-14T12:06:17.9235970 v2 52880 2019-11-26 Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-26 ACEM This paper presents an investigation of coupled thermal, hydraulic, and chemical behavior of a compacted bentonite buffer under the heating and hydration conditions of geological disposal of high-level nuclear waste. The study presented provides further insight into the evolution of hydro-geochemistry of the compacted bentonite and the clay microstructure effects through a numerical modelling development of the reactive transport of multicomponent chemicals. The application/validation case study is based on a series of laboratory tests on heating and hydration of compacted bentonite for a period of 0.5–7.6 years reported in the literature. The effects of microstructure evolution during hydration and dehydration on the transport phenomena are included via a new approach that links the geochemistry of clay hydration/dehydration with the transport properties. The analysis results related to the moisture flow and chloride transport demonstrate close correlation with the experimental results by the inclusion of the effects of microstructure evolution in the transport phenomena. The results of numerical analysis of reactive transport of chemicals highlight the importance of accessory minerals present in bentonite on the distribution of some anionic species. The behavior of major cationic species is shown to be mainly governed by the transport processes. Further insights into the chemically driven processes in clay buffer due to coupled hydraulic and thermal effects are presented and discussed that are captured from the results of modeling the clay-water-chemical system. Journal Article Journal of Geotechnical and Geoenvironmental Engineering 144 10 04018075 American Society of Civil Engineers (ASCE) 1090-0241 1943-5606 1 10 2018 2018-10-01 10.1061/(asce)gt.1943-5606.0001955 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2020-08-14T12:06:17.9235970 2019-11-26T10:45:44.2004824 Majid Sedighi 1 Hywel Thomas 0000-0002-3951-0409 2 Philip J. Vardon 3
title Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
spellingShingle Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
Hywel Thomas
title_short Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
title_full Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
title_fullStr Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
title_full_unstemmed Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
title_sort Reactive Transport of Chemicals in Compacted Bentonite under Nonisothermal Water Infiltration
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Majid Sedighi
Hywel Thomas
Philip J. Vardon
format Journal article
container_title Journal of Geotechnical and Geoenvironmental Engineering
container_volume 144
container_issue 10
container_start_page 04018075
publishDate 2018
institution Swansea University
issn 1090-0241
1943-5606
doi_str_mv 10.1061/(asce)gt.1943-5606.0001955
publisher American Society of Civil Engineers (ASCE)
document_store_str 0
active_str 0
description This paper presents an investigation of coupled thermal, hydraulic, and chemical behavior of a compacted bentonite buffer under the heating and hydration conditions of geological disposal of high-level nuclear waste. The study presented provides further insight into the evolution of hydro-geochemistry of the compacted bentonite and the clay microstructure effects through a numerical modelling development of the reactive transport of multicomponent chemicals. The application/validation case study is based on a series of laboratory tests on heating and hydration of compacted bentonite for a period of 0.5–7.6 years reported in the literature. The effects of microstructure evolution during hydration and dehydration on the transport phenomena are included via a new approach that links the geochemistry of clay hydration/dehydration with the transport properties. The analysis results related to the moisture flow and chloride transport demonstrate close correlation with the experimental results by the inclusion of the effects of microstructure evolution in the transport phenomena. The results of numerical analysis of reactive transport of chemicals highlight the importance of accessory minerals present in bentonite on the distribution of some anionic species. The behavior of major cationic species is shown to be mainly governed by the transport processes. Further insights into the chemically driven processes in clay buffer due to coupled hydraulic and thermal effects are presented and discussed that are captured from the results of modeling the clay-water-chemical system.
published_date 2018-10-01T20:01:05Z
_version_ 1821436978915180544
score 11.047609

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