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Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology

2015Journal article Open access
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dc.contributor.authorFerraz, Eduardo
dc.contributor.authorAndrejkovicová, Slávka
dc.contributor.authorHajjaji, Walid
dc.contributor.authorVelosa, Ana Luísa
dc.contributor.authorSilva, António Santos
dc.contributor.authorRocha, Fernando
dc.date.accessioned2021-12-22T23:16:31Z
dc.date.available2021-12-22T23:16:31Z
dc.date.issued2015
dc.date.updated2021-12-22T19:34:22Z
dc.description.abstractThis research was focused on the use of the modified Chapelle test as a direct laboratory methodology to access the pozzolanic activity of both experimental and commercial metakaolins. At the same time, this test was used in the evaluation of experimental metakaolins. This chemical test, performed during 16 hours at 90 °C, allows the quantification of portlandite fixed by the metakaolin sample. The calcium hydroxide that was not consumed is quantified by acid titration (HCl), and the test result is expressed in mg of fixed calcium hydroxide by g of metakaolin. According to this test, the pozzolanic activity of a metakaolin should not be less than 700 mg Ca(OH)2 / g metakaolin. The modified Chapelle pozzolanic activity of six commercial metakaolins was evaluated between 920 and 1560 mg Ca(OH)2 / g metakaolin. From the seven experimental metakaolins produced between 750 ºC and 940 ºC, a material with modified Chapelle pozzolanic activity value of 1240 mg Ca(OH)2 / g metakaolin was obtained, which is similar to some tested commercial metakaolins produced at industrial scale. The metakaolin produced at 800 ºC was ground, resulting in a particle size reduction of ≈ 4x less and a consequent increase of 21% in the pozzolanic activity.pt_PT
dc.description.sponsorshipThis research was supported by Sistema de Incentivos à Investigação e Desenvolvimento Tecnológico - Vale I&DT to Cerâmica Condestável, Lda (Portugal), supported by Quadro de Referência Estratégica Nacional, Rese arch Project METACAL - Study of Lime-Metakaolin Mortars for Building Conservation (PTDC/ECM/100431/2008), Research Unit (UID/GEO/04035/2013) and Projecto Estratégico (PEst-OE/CTE/UI4035/2014) financed by the Fundação para a Ciência e a Tecnologia (FCT) and COMPETE - Programa Operacional Factores de Competitividade.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.13168/AGG.2015.0026pt_PT
dc.identifier.eid2-s2.0-84942109711
dc.identifier.slugcv-prod-55447
dc.identifier.urihttp://hdl.handle.net/10400.26/38418
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relation.publisherversionhttps://www.irsm.cas.cz/index_en.php?page=acta_detail_doi&id=122pt_PT
dc.subjectcalcined kaolinspt_PT
dc.subjectlaboratorial chemical testpt_PT
dc.subjectcation exchange capacitypt_PT
dc.subjectspecific surface areapt_PT
dc.subjectparticlept_PT
dc.titlePozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methologypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FECM%2F100431%2F2008/PT
oaire.citation.endPage298pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage289pt_PT
oaire.citation.titleActa Geodynamica et Geomaterialiapt_PT
oaire.citation.volume12pt_PT
oaire.fundingStream5876-PPCDTI
person.familyNameFerraz
person.givenNameEduardo
person.identifier.ciencia-idC517-A240-7C81
person.identifier.orcid0000-0003-4717-6305
person.identifier.ridB-7140-2014
person.identifier.scopus-author-id7003480912
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaidC517-A240-7C81 | Eduardo Jorge Marques de Oliveira Ferraz
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isAuthorOfPublication.latestForDiscovery94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isProjectOfPublication5914068c-f2c2-48ca-8879-8aff64fa28aa
relation.isProjectOfPublication.latestForDiscovery5914068c-f2c2-48ca-8879-8aff64fa28aa

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