Characterisation of the multi-scale fabric features of high plasticity clays

An investigation of the microstructural features of a high-plasticity clay, in both its natural conditions and reconstituted in the laboratory, is described. Scanning electron microscopy is used here to characterise the fabric at different magnifications, while image processing of the micrographs de...

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Autores: Cotecchia, Federica, Guglielmi, S., Cafaro, F., Gens Solé, Antonio|||0000-0001-7588-7054
Formato: artículo
Fecha de publicación:2019
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:2117/175862
Acesso em linha:https://hdl.handle.net/2117/175862
https://dx.doi.org/10.1680/jgele.18.00230
Access Level:acceso abierto
Palavra-chave:Clay soils--Testing
Clays
Fabric/structure of soils
Microscopy
Argila -- Plasticitat
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
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oai_identifier_str oai:upcommons.upc.edu:2117/175862
network_acronym_str ES
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repository_id_str
spelling Characterisation of the multi-scale fabric features of high plasticity claysCotecchia, FedericaGuglielmi, S.Cafaro, F.Gens Solé, Antonio|||0000-0001-7588-7054Clay soils--TestingClaysFabric/structure of soilsMicroscopyArgila -- PlasticitatÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòlsAn investigation of the microstructural features of a high-plasticity clay, in both its natural conditions and reconstituted in the laboratory, is described. Scanning electron microscopy is used here to characterise the fabric at different magnifications, while image processing of the micrographs delivers a quantitative assessment of the fabric orientation. The results of energy-dispersive X-ray spectroscopy and swelling tests, as reported in a previous study by the authors, are used to characterise the bonding nature and strength, as well as mercury intrusion porosimetry to investigate clay porosimetry. Despite their identical composition, the natural and the reconstituted clay have experienced different deposition and loading history, generating different microstructural features that are shown to underlie their differences in state. For both clays, one-dimensional (1D) compression to medium–high pressures is seen to determine a well-oriented medium magnification fabric. However, larger-scale observations and the corresponding image processing results reveal non-uniform local fabric features, hence making fabric characterisation dependent on the scale of analysis and bringing about the issue of identifying the clay micro-scale representative element volume relating to the clay macro-behaviour. The micro-REV is identified for the clays under study and its connection with the macro-behaviour characterised. The microstructural evolution induced by 1D compression to very high pressures is shown to concern mainly the clay porosity and porosimetry, the fabric orientation being steady, thus explaining the isotropic hardening observed in laboratory tests.Peer ReviewedInstitution of Civil Engineers (ICE)20192019-12-0120202020-01-27journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/175862https://dx.doi.org/10.1680/jgele.18.00230reponame: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:2117/1758622026-05-27T15:37:01Z
dc.title.none.fl_str_mv Characterisation of the multi-scale fabric features of high plasticity clays
title Characterisation of the multi-scale fabric features of high plasticity clays
spellingShingle Characterisation of the multi-scale fabric features of high plasticity clays
Cotecchia, Federica
Clay soils--Testing
Clays
Fabric/structure of soils
Microscopy
Argila -- Plasticitat
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
title_short Characterisation of the multi-scale fabric features of high plasticity clays
title_full Characterisation of the multi-scale fabric features of high plasticity clays
title_fullStr Characterisation of the multi-scale fabric features of high plasticity clays
title_full_unstemmed Characterisation of the multi-scale fabric features of high plasticity clays
title_sort Characterisation of the multi-scale fabric features of high plasticity clays
dc.creator.none.fl_str_mv Cotecchia, Federica
Guglielmi, S.
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author Cotecchia, Federica
author_facet Cotecchia, Federica
Guglielmi, S.
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author_role author
author2 Guglielmi, S.
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author2_role author
author
author
dc.subject.none.fl_str_mv Clay soils--Testing
Clays
Fabric/structure of soils
Microscopy
Argila -- Plasticitat
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
topic Clay soils--Testing
Clays
Fabric/structure of soils
Microscopy
Argila -- Plasticitat
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
description An investigation of the microstructural features of a high-plasticity clay, in both its natural conditions and reconstituted in the laboratory, is described. Scanning electron microscopy is used here to characterise the fabric at different magnifications, while image processing of the micrographs delivers a quantitative assessment of the fabric orientation. The results of energy-dispersive X-ray spectroscopy and swelling tests, as reported in a previous study by the authors, are used to characterise the bonding nature and strength, as well as mercury intrusion porosimetry to investigate clay porosimetry. Despite their identical composition, the natural and the reconstituted clay have experienced different deposition and loading history, generating different microstructural features that are shown to underlie their differences in state. For both clays, one-dimensional (1D) compression to medium–high pressures is seen to determine a well-oriented medium magnification fabric. However, larger-scale observations and the corresponding image processing results reveal non-uniform local fabric features, hence making fabric characterisation dependent on the scale of analysis and bringing about the issue of identifying the clay micro-scale representative element volume relating to the clay macro-behaviour. The micro-REV is identified for the clays under study and its connection with the macro-behaviour characterised. The microstructural evolution induced by 1D compression to very high pressures is shown to concern mainly the clay porosity and porosimetry, the fabric orientation being steady, thus explaining the isotropic hardening observed in laboratory tests.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-12-01
2020
2020-01-27
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/175862
https://dx.doi.org/10.1680/jgele.18.00230
url https://hdl.handle.net/2117/175862
https://dx.doi.org/10.1680/jgele.18.00230
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 Institution of Civil Engineers (ICE)
publisher.none.fl_str_mv Institution of Civil Engineers (ICE)
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 15,301629

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