Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition

Detalhes bibliográficos
Autor(a) principal: Santos Silva, A.
Data de Publicação: 2014
Outros Autores: Gameiro, A., Grilo, J., Veiga, M. R., Velosa, A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1006043
Resumo: This paper presents the reaction behavior of lime and metakaolin (MK) pastes submitted to long term aging at ambient temperature and relative humidity of 95 ± 5%. The results presented are the basis for an extensive research pointing towards the formulation of lime based mortars for conservation of historic buildings, namely in humid environments. MK, when mixed with calcium hydroxide, in the presence of water, originates a set of major hydrated compounds, specifically, stratlingite, monocarboaluminate and calcium aluminate hydrate. The type of hydrated compounds formed is dependent on the lime/MK ratio, being some of them unstable over time. This instability can compromise the mechanical properties of lime–MK mortars. From this work different reaction kinetics with aging were perceived, being the best results in terms of the pozzolanic reaction obtained with 50% MK content. Pastes with less than 25% of MK also present reliable stability.
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spelling Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing conditionAir lime–metakaolin pasteXrdTg–dtaHydration productsPozzolanic reactionsThis paper presents the reaction behavior of lime and metakaolin (MK) pastes submitted to long term aging at ambient temperature and relative humidity of 95 ± 5%. The results presented are the basis for an extensive research pointing towards the formulation of lime based mortars for conservation of historic buildings, namely in humid environments. MK, when mixed with calcium hydroxide, in the presence of water, originates a set of major hydrated compounds, specifically, stratlingite, monocarboaluminate and calcium aluminate hydrate. The type of hydrated compounds formed is dependent on the lime/MK ratio, being some of them unstable over time. This instability can compromise the mechanical properties of lime–MK mortars. From this work different reaction kinetics with aging were perceived, being the best results in terms of the pozzolanic reaction obtained with 50% MK content. Pastes with less than 25% of MK also present reliable stability.Elsevier2014-05-02T12:21:51Z2014-10-20T16:31:43Z2017-04-12T15:00:57Z2014-02-01T00:00:00Z2014-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1006043engSantos Silva, A.Gameiro, A.Grilo, J.Veiga, M. R.Velosa, A.info: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:RCAAP2024-01-13T03:02:32Zoai:localhost:123456789/1006043Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:38:35.950096Repositório 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 Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
title Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
spellingShingle Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
Santos Silva, A.
Air lime–metakaolin paste
Xrd
Tg–dta
Hydration products
Pozzolanic reactions
title_short Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
title_full Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
title_fullStr Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
title_full_unstemmed Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
title_sort Long-term behavior of lime–metakaolin pastes at ambient temperature and humid curing condition
author Santos Silva, A.
author_facet Santos Silva, A.
Gameiro, A.
Grilo, J.
Veiga, M. R.
Velosa, A.
author_role author
author2 Gameiro, A.
Grilo, J.
Veiga, M. R.
Velosa, A.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Santos Silva, A.
Gameiro, A.
Grilo, J.
Veiga, M. R.
Velosa, A.
dc.subject.por.fl_str_mv Air lime–metakaolin paste
Xrd
Tg–dta
Hydration products
Pozzolanic reactions
topic Air lime–metakaolin paste
Xrd
Tg–dta
Hydration products
Pozzolanic reactions
description This paper presents the reaction behavior of lime and metakaolin (MK) pastes submitted to long term aging at ambient temperature and relative humidity of 95 ± 5%. The results presented are the basis for an extensive research pointing towards the formulation of lime based mortars for conservation of historic buildings, namely in humid environments. MK, when mixed with calcium hydroxide, in the presence of water, originates a set of major hydrated compounds, specifically, stratlingite, monocarboaluminate and calcium aluminate hydrate. The type of hydrated compounds formed is dependent on the lime/MK ratio, being some of them unstable over time. This instability can compromise the mechanical properties of lime–MK mortars. From this work different reaction kinetics with aging were perceived, being the best results in terms of the pozzolanic reaction obtained with 50% MK content. Pastes with less than 25% of MK also present reliable stability.
publishDate 2014
dc.date.none.fl_str_mv 2014-05-02T12:21:51Z
2014-10-20T16:31:43Z
2014-02-01T00:00:00Z
2014-02
2017-04-12T15:00:57Z
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://repositorio.lnec.pt:8080/jspui/handle/123456789/1006043
url http://repositorio.lnec.pt:8080/jspui/handle/123456789/1006043
dc.language.iso.fl_str_mv eng
language eng
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.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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
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