Hydro-mechanical behaviour of bentonite pellet mixtures

Granular mixtures made of high-density pellets of bentonite are being evaluated as an alternative buffer material for waste isolation. Ease of handling is an often-mentioned advantage. The paper described the experimental program performed to characterize the hydromechanical behaviour of compacted p...

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Detalles Bibliográficos
Autores: Hoffmann Jauge, Christian, Alonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951, Romero Morales, Enrique Edgar|||0000-0002-4105-8941
Tipo de recurso: artículo
Fecha de publicación:2007
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/2225
Acceso en línea:https://hdl.handle.net/2117/2225
Access Level:acceso abierto
Palabra clave:Bentonite
Testing
Soil mechanics
Laboratory tests
Laboratory equipment
Partial saturation
Suction
Granular mixture
Bentonita
Propietats mecàniques
Assaigs de materials
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spelling Hydro-mechanical behaviour of bentonite pellet mixturesHoffmann Jauge, ChristianAlonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951Romero Morales, Enrique Edgar|||0000-0002-4105-8941BentoniteTestingSoil mechanicsBentoniteLaboratory testsLaboratory equipmentPartial saturationSuctionGranular mixtureBentonitaPropietats mecàniquesAssaigs de materialsGranular mixtures made of high-density pellets of bentonite are being evaluated as an alternative buffer material for waste isolation. Ease of handling is an often-mentioned advantage. The paper described the experimental program performed to characterize the hydromechanical behaviour of compacted pellet’s mixtures used in the engineered barrier (EB) experiment. The material tested in the laboratory was based in the pellet’s mixtures actually used for the emplacement of the EB in situ experiment. Grain size distribution was adjusted to a maximum pellet size compatible with the specimen’s dimensions. Dry densities of statically compacted specimens varied in most of the cases in the range: 1.3–1.5 Mg/m3. Pellets had a very high dry density, close to 2 Mg/m3. The outstanding characteristic of these mixtures is its discontinuous porosity. Pore sizes of the compacted pellets vary around 10 nm. However the inter-pellet size of the pores is four to five orders of magnitude higher. This double porosity and the highly expansive nature of the pellets controlled all the hydraulic and mechanical properties of the mixture. Tests performed include infiltration tests using different water injection rates and mechanisms of water transfer (in liquid and vapour phases), suction controlled oedometer tests and swelling pressure tests. The interpretation of some of the tests performed required backanalysis procedures using a hydro-mechanical (HM) computer code. Material response was studied within the framework of the elastoplastic constitutive model proposed by Alonso et al. [Alonso, E.E., Gens, A., Josa, A., 1990. A constitutive model for partially saturated soils. Geotechnique 40 (3), 405–430] (Barcelona Basic Model, BBM). Parameters for the model were identified and also a set of hydraulic laws necessary to perform coupled HM analysis.Peer ReviewedElsevier20072007-01-0120082008-08-12journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/2225reponame: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:2117/22252026-05-27T15:37:01Z
dc.title.none.fl_str_mv Hydro-mechanical behaviour of bentonite pellet mixtures
title Hydro-mechanical behaviour of bentonite pellet mixtures
spellingShingle Hydro-mechanical behaviour of bentonite pellet mixtures
Hoffmann Jauge, Christian
Bentonite
Testing
Soil mechanics
Bentonite
Laboratory tests
Laboratory equipment
Partial saturation
Suction
Granular mixture
Bentonita
Propietats mecàniques
Assaigs de materials
title_short Hydro-mechanical behaviour of bentonite pellet mixtures
title_full Hydro-mechanical behaviour of bentonite pellet mixtures
title_fullStr Hydro-mechanical behaviour of bentonite pellet mixtures
title_full_unstemmed Hydro-mechanical behaviour of bentonite pellet mixtures
title_sort Hydro-mechanical behaviour of bentonite pellet mixtures
dc.creator.none.fl_str_mv Hoffmann Jauge, Christian
Alonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951
Romero Morales, Enrique Edgar|||0000-0002-4105-8941
author Hoffmann Jauge, Christian
author_facet Hoffmann Jauge, Christian
Alonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951
Romero Morales, Enrique Edgar|||0000-0002-4105-8941
author_role author
author2 Alonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951
Romero Morales, Enrique Edgar|||0000-0002-4105-8941
author2_role author
author
dc.subject.none.fl_str_mv Bentonite
Testing
Soil mechanics
Bentonite
Laboratory tests
Laboratory equipment
Partial saturation
Suction
Granular mixture
Bentonita
Propietats mecàniques
Assaigs de materials
topic Bentonite
Testing
Soil mechanics
Bentonite
Laboratory tests
Laboratory equipment
Partial saturation
Suction
Granular mixture
Bentonita
Propietats mecàniques
Assaigs de materials
description Granular mixtures made of high-density pellets of bentonite are being evaluated as an alternative buffer material for waste isolation. Ease of handling is an often-mentioned advantage. The paper described the experimental program performed to characterize the hydromechanical behaviour of compacted pellet’s mixtures used in the engineered barrier (EB) experiment. The material tested in the laboratory was based in the pellet’s mixtures actually used for the emplacement of the EB in situ experiment. Grain size distribution was adjusted to a maximum pellet size compatible with the specimen’s dimensions. Dry densities of statically compacted specimens varied in most of the cases in the range: 1.3–1.5 Mg/m3. Pellets had a very high dry density, close to 2 Mg/m3. The outstanding characteristic of these mixtures is its discontinuous porosity. Pore sizes of the compacted pellets vary around 10 nm. However the inter-pellet size of the pores is four to five orders of magnitude higher. This double porosity and the highly expansive nature of the pellets controlled all the hydraulic and mechanical properties of the mixture. Tests performed include infiltration tests using different water injection rates and mechanisms of water transfer (in liquid and vapour phases), suction controlled oedometer tests and swelling pressure tests. The interpretation of some of the tests performed required backanalysis procedures using a hydro-mechanical (HM) computer code. Material response was studied within the framework of the elastoplastic constitutive model proposed by Alonso et al. [Alonso, E.E., Gens, A., Josa, A., 1990. A constitutive model for partially saturated soils. Geotechnique 40 (3), 405–430] (Barcelona Basic Model, BBM). Parameters for the model were identified and also a set of hydraulic laws necessary to perform coupled HM analysis.
publishDate 2007
dc.date.none.fl_str_mv 2007
2007-01-01
2008
2008-08-12
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/2225
url https://hdl.handle.net/2117/2225
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 Elsevier
publisher.none.fl_str_mv Elsevier
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
_version_ 1869411714457403392
score 15.301603

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