Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling

The ability of helium gas displacement pycnometry to characterise the reduction of adsorbed water density with increasing bentonite water content was tested. For this purpose, after obtaining the grain density (which was assumed to be constant), an intensive campaign of 45 experiments was carried ou...

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Autores: Navarro Gámir, Vicente, Cabrera Soto, Virginia, Merlo Espinosa, Óscar, de la Morena Borja, Gema, Torres Serra, Joel|||0000-0002-2267-4570
Tipo de recurso: artículo
Fecha de publicación:2022
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:2117/379851
Acceso en línea:https://hdl.handle.net/2117/379851
https://dx.doi.org/10.1016/j.clay.2022.106434
Access Level:acceso abierto
Palabra clave:Bentonite deposits
Helium gas displacement pycnometry
Adsorbed water density
Soil specific gravity
Microstructural void ratio
Macroscopic modelling
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
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spelling Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modellingNavarro Gámir, VicenteCabrera Soto, VirginiaMerlo Espinosa, Óscarde la Morena Borja, GemaTorres Serra, Joel|||0000-0002-2267-4570Bentonite depositsHelium gas displacement pycnometryAdsorbed water densitySoil specific gravityMicrostructural void ratioMacroscopic modellingBentonita -- Propietats mecàniquesÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòlsÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residusThe ability of helium gas displacement pycnometry to characterise the reduction of adsorbed water density with increasing bentonite water content was tested. For this purpose, after obtaining the grain density (which was assumed to be constant), an intensive campaign of 45 experiments was carried out with two bentonites for a total of 90 determinations, obtaining very consistent water density results. Furthermore, the water retention curve of one of the two bentonites was fully characterised by 95 tests with a chilled-mirror dew-point psychrometer. The water content results were used to determine the microstructural void ratio, both assuming a constant water density and considering the variation of the adsorbed water density obtained with the helium pycnometer. It was verified that with the constant value, by assuming a lower water density (1 g/cm3) than the experimental (values of 1.20 g/cm3 were obtained under hygroscopic conditions), higher values of microstructural void ratios are predicted, up to 15% greater for a relative humidity of 70% (0.46 instead of 0.40). For higher relative humidities the comparison loses its consistency, since the presence of capillary water cannot be disregarded, and the calculation of the microstructural void ratio is based on the assumption that the water present in bentonite is mainly in the form of adsorbed water. However, this does not compromise the analysis performed, as the results obtained for lower relative humidity values provide enough information to demonstrate the relevance of the errors that can occur when deriving models of the microstructural void ratio without taking into account the variation of the density of adsorbed water.This study was funded by the Junta de Comunidades de Castilla-La Mancha and the European Regional Development Fund (European Union) through project SBPLY/19/180501/000222.Peer Reviewed20222022-03-0120232023-01-10journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/379851https://dx.doi.org/10.1016/j.clay.2022.106434reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3798512026-05-27T15:37:01Z
dc.title.none.fl_str_mv Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
title Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
spellingShingle Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
Navarro Gámir, Vicente
Bentonite deposits
Helium gas displacement pycnometry
Adsorbed water density
Soil specific gravity
Microstructural void ratio
Macroscopic modelling
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
title_short Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
title_full Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
title_fullStr Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
title_full_unstemmed Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
title_sort Density of water adsorbed on bentonites: determination and effect on microstructural void ratio modelling
dc.creator.none.fl_str_mv Navarro Gámir, Vicente
Cabrera Soto, Virginia
Merlo Espinosa, Óscar
de la Morena Borja, Gema
Torres Serra, Joel|||0000-0002-2267-4570
author Navarro Gámir, Vicente
author_facet Navarro Gámir, Vicente
Cabrera Soto, Virginia
Merlo Espinosa, Óscar
de la Morena Borja, Gema
Torres Serra, Joel|||0000-0002-2267-4570
author_role author
author2 Cabrera Soto, Virginia
Merlo Espinosa, Óscar
de la Morena Borja, Gema
Torres Serra, Joel|||0000-0002-2267-4570
author2_role author
author
author
author
dc.subject.none.fl_str_mv Bentonite deposits
Helium gas displacement pycnometry
Adsorbed water density
Soil specific gravity
Microstructural void ratio
Macroscopic modelling
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
topic Bentonite deposits
Helium gas displacement pycnometry
Adsorbed water density
Soil specific gravity
Microstructural void ratio
Macroscopic modelling
Bentonita -- Propietats mecàniques
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
description The ability of helium gas displacement pycnometry to characterise the reduction of adsorbed water density with increasing bentonite water content was tested. For this purpose, after obtaining the grain density (which was assumed to be constant), an intensive campaign of 45 experiments was carried out with two bentonites for a total of 90 determinations, obtaining very consistent water density results. Furthermore, the water retention curve of one of the two bentonites was fully characterised by 95 tests with a chilled-mirror dew-point psychrometer. The water content results were used to determine the microstructural void ratio, both assuming a constant water density and considering the variation of the adsorbed water density obtained with the helium pycnometer. It was verified that with the constant value, by assuming a lower water density (1 g/cm3) than the experimental (values of 1.20 g/cm3 were obtained under hygroscopic conditions), higher values of microstructural void ratios are predicted, up to 15% greater for a relative humidity of 70% (0.46 instead of 0.40). For higher relative humidities the comparison loses its consistency, since the presence of capillary water cannot be disregarded, and the calculation of the microstructural void ratio is based on the assumption that the water present in bentonite is mainly in the form of adsorbed water. However, this does not compromise the analysis performed, as the results obtained for lower relative humidity values provide enough information to demonstrate the relevance of the errors that can occur when deriving models of the microstructural void ratio without taking into account the variation of the density of adsorbed water.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-03-01
2023
2023-01-10
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/2117/379851
https://dx.doi.org/10.1016/j.clay.2022.106434
url https://hdl.handle.net/2117/379851
https://dx.doi.org/10.1016/j.clay.2022.106434
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
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
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
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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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