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

Detalhes bibliográficos
Autor(a) principal: Ferraz, Eduardo
Data de Publicação: 2015
Outros Autores: Andrejkovicová, Slávka, Hajjaji, Walid, Velosa, Ana Luísa, Silva, António Santos, Rocha, Fernando
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.26/38418
Resumo: This 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.
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spelling Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methologycalcined kaolinslaboratorial chemical testcation exchange capacityspecific surface areaparticleThis 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.This 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.Repositório ComumFerraz, EduardoAndrejkovicová, SlávkaHajjaji, WalidVelosa, Ana LuísaSilva, António SantosRocha, Fernando2021-12-22T23:16:31Z20152021-12-22T19:34:22Z2015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.26/38418engcv-prod-5544710.13168/AGG.2015.00262-s2.0-84942109711info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-10-20T10:52:48Zoai:comum.rcaap.pt:10400.26/38418Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:37:15.411439Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
title Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
spellingShingle Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
Ferraz, Eduardo
calcined kaolins
laboratorial chemical test
cation exchange capacity
specific surface area
particle
title_short Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
title_full Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
title_fullStr Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
title_full_unstemmed Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
title_sort Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
author Ferraz, Eduardo
author_facet Ferraz, Eduardo
Andrejkovicová, Slávka
Hajjaji, Walid
Velosa, Ana Luísa
Silva, António Santos
Rocha, Fernando
author_role author
author2 Andrejkovicová, Slávka
Hajjaji, Walid
Velosa, Ana Luísa
Silva, António Santos
Rocha, Fernando
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório Comum
dc.contributor.author.fl_str_mv Ferraz, Eduardo
Andrejkovicová, Slávka
Hajjaji, Walid
Velosa, Ana Luísa
Silva, António Santos
Rocha, Fernando
dc.subject.por.fl_str_mv calcined kaolins
laboratorial chemical test
cation exchange capacity
specific surface area
particle
topic calcined kaolins
laboratorial chemical test
cation exchange capacity
specific surface area
particle
description This 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.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01T00:00:00Z
2021-12-22T23:16:31Z
2021-12-22T19:34:22Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.26/38418
url http://hdl.handle.net/10400.26/38418
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv cv-prod-55447
10.13168/AGG.2015.0026
2-s2.0-84942109711
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eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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