Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite

The bentonite barrier of underground repositories for high-level radioactive waste will be hydrated by the groundwater while it is subjected to high temperatures due to the radioactive decay of the wastes. These changes of temperature affect the hydraulic and mechanical responses of bentonite, which...

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Autores: Villar, María Victoria, Gómez-Espina, R., Lloret Morancho, Antonio|||0000-0001-7991-8487
Formato: artículo
Fecha de publicación:2010
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/15238
Acesso em linha:https://hdl.handle.net/2117/15238
https://dx.doi.org/10.3724/SP.J.1235.2010.00071
Access Level:acceso abierto
Palavra-chave:Radioactive waste disposal in the ground
Bentonite deposits
Swelling
Permeability
Water retention capacity
Residus radioactius -- Emmagatzematge
Mecànica dels sòls
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Energies::Energia nuclear
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
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network_acronym_str ES
network_name_str España
repository_id_str
spelling Experimental investigation into temperature effect on hydro-mechanical behaviours of bentoniteVillar, María VictoriaGómez-Espina, R.Lloret Morancho, Antonio|||0000-0001-7991-8487Radioactive waste disposal in the groundBentonite depositsSwellingPermeabilityWater retention capacityResidus radioactius -- EmmagatzematgeMecànica dels sòlsBentonita -- Propietats mecàniquesÀrees temàtiques de la UPC::Energies::Energia nuclearÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residusÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòlsThe bentonite barrier of underground repositories for high-level radioactive waste will be hydrated by the groundwater while it is subjected to high temperatures due to the radioactive decay of the wastes. These changes of temperature affect the hydraulic and mechanical responses of bentonite, which has important effects on design and performance of repositories. The temperature influence on the hydro-mechanical behaviour of bentonite was studied in this paper by experiments, which were carried out with the Spanish FEBEX bentonite compacted at dry densities expected in the repository (from 1.5 to 1.8 Mg/m3). The dependence of the swelling strains of bentonite on the temperature has been measured from 30 °C to 90 °C. At high temperatures the swelling capacity of clay slightly decreases. Also, a clear decrease of swelling pressure as a function of temperature was observed for the same dry densities. Nevertheless, the deformation of bentonite is more dependent on the stress than the temperature. An increase in the permeability of water saturated bentonite with temperature has also been detected. The water retention curves of bentonite compacted at different dry densities were determined under isochoric conditions and in the range of temperatures from 20 °C to 120 °C. For a given density and water content, the suction decreases as the temperature increases at a rate, which is larger than the one predicted on the basis of water surface tension changing with temperature. Mechanisms related to the physico-chemical interactions that take place at microscopic level, in particular the transfer of interlayer water to the macropores triggered by temperature, seem to explain qualitatively the experimental observations.Science Press20102010-01-0120122012-02-17journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/15238https://dx.doi.org/10.3724/SP.J.1235.2010.00071reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/152382026-05-27T15:37:01Z
dc.title.none.fl_str_mv Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
title Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
spellingShingle Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
Villar, María Victoria
Radioactive waste disposal in the ground
Bentonite deposits
Swelling
Permeability
Water retention capacity
Residus radioactius -- Emmagatzematge
Mecànica dels sòls
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Energies::Energia nuclear
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
title_short Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
title_full Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
title_fullStr Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
title_full_unstemmed Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
title_sort Experimental investigation into temperature effect on hydro-mechanical behaviours of bentonite
dc.creator.none.fl_str_mv Villar, María Victoria
Gómez-Espina, R.
Lloret Morancho, Antonio|||0000-0001-7991-8487
author Villar, María Victoria
author_facet Villar, María Victoria
Gómez-Espina, R.
Lloret Morancho, Antonio|||0000-0001-7991-8487
author_role author
author2 Gómez-Espina, R.
Lloret Morancho, Antonio|||0000-0001-7991-8487
author2_role author
author
dc.subject.none.fl_str_mv Radioactive waste disposal in the ground
Bentonite deposits
Swelling
Permeability
Water retention capacity
Residus radioactius -- Emmagatzematge
Mecànica dels sòls
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Energies::Energia nuclear
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
topic Radioactive waste disposal in the ground
Bentonite deposits
Swelling
Permeability
Water retention capacity
Residus radioactius -- Emmagatzematge
Mecànica dels sòls
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Energies::Energia nuclear
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
description The bentonite barrier of underground repositories for high-level radioactive waste will be hydrated by the groundwater while it is subjected to high temperatures due to the radioactive decay of the wastes. These changes of temperature affect the hydraulic and mechanical responses of bentonite, which has important effects on design and performance of repositories. The temperature influence on the hydro-mechanical behaviour of bentonite was studied in this paper by experiments, which were carried out with the Spanish FEBEX bentonite compacted at dry densities expected in the repository (from 1.5 to 1.8 Mg/m3). The dependence of the swelling strains of bentonite on the temperature has been measured from 30 °C to 90 °C. At high temperatures the swelling capacity of clay slightly decreases. Also, a clear decrease of swelling pressure as a function of temperature was observed for the same dry densities. Nevertheless, the deformation of bentonite is more dependent on the stress than the temperature. An increase in the permeability of water saturated bentonite with temperature has also been detected. The water retention curves of bentonite compacted at different dry densities were determined under isochoric conditions and in the range of temperatures from 20 °C to 120 °C. For a given density and water content, the suction decreases as the temperature increases at a rate, which is larger than the one predicted on the basis of water surface tension changing with temperature. Mechanisms related to the physico-chemical interactions that take place at microscopic level, in particular the transfer of interlayer water to the macropores triggered by temperature, seem to explain qualitatively the experimental observations.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01
2012
2012-02-17
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/15238
https://dx.doi.org/10.3724/SP.J.1235.2010.00071
url https://hdl.handle.net/2117/15238
https://dx.doi.org/10.3724/SP.J.1235.2010.00071
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Science Press
publisher.none.fl_str_mv Science Press
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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