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dc.contributor.authorVallina, Diego
dc.contributor.authorRodríguez-Ruiz, María Dolores 
dc.contributor.authorSantacruz-Cruz, María Isabel 
dc.contributor.authorCuesta, Ana
dc.contributor.authorGarcía-Aranda, Miguel Ángel 
dc.contributor.authorGómez-de-la-Torre, María de los Ángeles 
dc.date.accessioned2024-04-16T06:53:35Z
dc.date.available2024-04-16T06:53:35Z
dc.date.issued2024-05-03
dc.identifier.citationDiego Vallina, María Dolores Rodríguez-Ruiz, Isabel Santacruz, Ana Cuesta, Miguel A.G. Aranda, Angeles G. De la Torre, Supplementary cementitious material based on calcined montmorillonite standards, Construction and Building Materials, Volume 426, 2024, 136193, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2024.136193.es_ES
dc.identifier.urihttps://hdl.handle.net/10630/31037
dc.description.abstractThe most effective approach to mitigating the environmental impact of cement production is through the uti- lisation of pozzolanic materials to prepare blended cement. Calcined kaolinitic clays are one of the most promising materials to be used as supplementary cementitious materials (SCM) due to their final performances. However, there are locations where kaolinitic rocks are not available. This work presents the study of two dioctahedral smectite standards from the Clay Minerals Society (CMS), SWy-3 and SAu-1, to be used as refer- ences. After thermal activation optimisation, their pozzolanic performances are compared with those of low- grade kaolinitic clay. On the one hand, raw SWy-3 has an amorphous content of ~80 wt%, considered mont- morillonite, with quartz and feldspars. The optimum calcination temperature was 800ºC, at which the smectite is fully dehydroxylated (as determined by thermal analysis) but not completely amorphized (as shown by powder diffraction). After calcination (800ºC), with a median particle size by volume (Dv,50) of ~11 μm, ~480 J/g were released at 7 days in the R3 test. On the other hand, SAu-1 has a higher amount of amorphous content, ~96 wt%, which includes interstratified illite/smectite. The optimum calcination temperature was found to be 750ºC. This sample (Dv,50 ~10 μm) gave 452 J/g at 7 days in the R3 test. The optimised active smectites gave a pozzolanic activity comparable to clay with 30–35 % kaolinite, as determined, for the first time, by the R3 test. This work has established descriptors for the activation of natural smectites/bentonites and reference values for the resulting smectite-based SCMs.es_ES
dc.description.sponsorshipFunding for open access charge: Universidad de Málaga / CBUAes_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectCementoes_ES
dc.subjectArcillases_ES
dc.subject.otherSWy-3 standard montmorillonitees_ES
dc.subject.otherSAu-1 standard montmorillonitees_ES
dc.subject.otherR3 testes_ES
dc.subject.otherPozzolanses_ES
dc.subject.otherThermal activationes_ES
dc.subject.otherCalcined clayes_ES
dc.titleSupplementary cementitious material based on calcined montmorillonite standardses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.centroFacultad de Cienciases_ES
dc.identifier.doi10.1016/j.conbuildmat.2024.136193
dc.rights.ccAtribución-NoComercial-CompartirIgual 4.0 Internacional*
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones_ES


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