Pozzolanic activity of metakaolins by the French standard of the modified Chapelle test: A direct methology
Autor(a) principal: | |
---|---|
Data de Publicação: | 2015 |
Outros Autores: | , , , , |
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. |
id |
RCAP_0b8aadc901a43f3955cfd2f0529734ef |
---|---|
oai_identifier_str |
oai:comum.rcaap.pt:10400.26/38418 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
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 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
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 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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 |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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 |
repository.mail.fl_str_mv |
|
_version_ |
1799133634840494080 |