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dc.contributor.authorCotecchia, Federica
dc.contributor.authorGuglielmi, S.
dc.contributor.authorCafaro, F.
dc.contributor.authorGens Solé, Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.date.accessioned2020-01-27T23:37:08Z
dc.date.available2020-11-08T01:31:26Z
dc.date.issued2019-12
dc.identifier.citationCotecchia, F. [et al.]. Characterisation of the multi-scale fabric features of high plasticity clays. "Géotechnique letters", Desembre 2019, vol. 9, núm. 4, p. 361-368.
dc.identifier.issn2045-2543
dc.identifier.otherhttps://www.researchgate.net/publication/336346132_Characterisation_of_the_multi-scale_fabric_features_of_high_plasticity_clays
dc.identifier.urihttp://hdl.handle.net/2117/175862
dc.description.abstractAn 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.
dc.format.extent8 p.
dc.language.isoeng
dc.publisherInstitution of Civil Engineers (ICE)
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
dc.subject.lcshClay soils--Testing
dc.subject.otherClays
dc.subject.otherFabric/structure of soils
dc.subject.otherMicroscopy
dc.titleCharacterisation of the multi-scale fabric features of high plasticity clays
dc.typeArticle
dc.subject.lemacArgila -- Plasticitat
dc.contributor.groupUniversitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
dc.identifier.doi10.1680/jgele.18.00230
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.icevirtuallibrary.com/doi/10.1680/jgele.18.00230
dc.rights.accessOpen Access
local.identifier.drac26609790
dc.description.versionPostprint (author's final draft)
local.citation.authorCotecchia, F.; Guglielmi, S.; Cafaro, F.; Gens, A.
local.citation.publicationNameGéotechnique letters
local.citation.volume9
local.citation.number4
local.citation.startingPage361
local.citation.endingPage368


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