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dc.contributor.authorDanner, Tobias
dc.contributor.authorNorden, Geir
dc.contributor.authorJustnes, Harald
dc.date.accessioned2019-11-13T07:57:07Z
dc.date.available2019-11-13T07:57:07Z
dc.date.created2018-07-08T12:07:46Z
dc.date.issued2018
dc.identifier.citationApplied Clay Science. 2018, 162 391-402.nb_NO
dc.identifier.issn0169-1317
dc.identifier.urihttp://hdl.handle.net/11250/2628028
dc.description.abstractThe potential use of two raw clays (Clay A: kaolin; Clay B: calcareous montmorillonite) as supplementary cementitious material (SCM) in blended cements was investigated. Cement replacement in mortars by 20% calcined Clay A and Clay B resulted in a considerable 28 day compressive strength improvement. The pozzolanic reactivity of Clay A and B is explained by characterisation of the structural changes upon calcination with XRD, ICP-MS, FT-IR, 27Al NMR, Mössbauer spectroscopy and SEM. At the temperature giving highest pozzolanic reactivity, kaolinite and montmorillonite were completely dehydroxylated, while calcite from Clay B was not completely decomposed. FT-IR, 27Al NMR and Mössbauer spectroscopy revealed considerable structural deformations of kaolinite in Clay A and montmorillonite in Clay B resulting in an amorphous, reactive state. Oxidation of iron in Clay B during calcination contributed to strong distortions of the octahedral sheet in the montmorillonite structure. Additionally, the formation of a glass phase due to reaction of coccoliths (CaCO3) and montmorillonite was observed.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.subjectPozzolannb_NO
dc.subjectCementnb_NO
dc.subjectCoccolithnb_NO
dc.subjectMössbauer spectroscopynb_NO
dc.titleCharacterisation of calcined raw clays suitable as supplementary cementitious materialsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.rights.holder© 2018 Elsevier B.V. All rights reserved. This is the authors' accepted and refereed manuscript to the article. Released with a Creative Commons Attribution Non-Commercial No Derivatives License. The final publication is available at https://doi.org/10.1016/j.clay.2018.06.030nb_NO
dc.source.pagenumber391-402nb_NO
dc.source.volume162nb_NO
dc.source.journalApplied Clay Sciencenb_NO
dc.identifier.doi10.1016/j.clay.2018.06.030
dc.identifier.cristin1596234
cristin.unitcode7401,30,40,0
cristin.unitnameArkitektur, byggematerialer og konstruksjoner
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal