Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation
Autor(a) principal: | |
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Data de Publicação: | 2018 |
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/1822/57178 |
Resumo: | Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has been frequently used in order to make the matrix more resistant to the action of chlorides. On the other hand, it is known that Ca(OH)2 existing in the matrix is consumed by the pozzolanic reactions, which makes easier the carbonation front advance. Therefore, this paper presents a study of the behavior of cementitious matrices, with and without fly ash, subjected to the combined action of chlorides and carbonation. Two different kinds of mortars were produced: reference (only cement CEM I 42.5R) and fly ash mortar (40% replacement of cement). After curing, the specimens were subjected to three different wetting-drying cycles, considering NaCl solutions and CO2 atmospheres. Afterwards, chloride profiles and carbonation front were measured. Results show that carbonation has a direct influence on chloride penetration, decreasing it for cement mortars with 0% fly ash and increasing it for mortars with 40% cement replacement by fly ash. Moreover, the evolution of carbonation is also influenced by chloride presence, which decreases under the combined action. |
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Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonationCarbonationchlorideFly ashMortarWetting-drying cyclesScience & TechnologyCarbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has been frequently used in order to make the matrix more resistant to the action of chlorides. On the other hand, it is known that Ca(OH)2 existing in the matrix is consumed by the pozzolanic reactions, which makes easier the carbonation front advance. Therefore, this paper presents a study of the behavior of cementitious matrices, with and without fly ash, subjected to the combined action of chlorides and carbonation. Two different kinds of mortars were produced: reference (only cement CEM I 42.5R) and fly ash mortar (40% replacement of cement). After curing, the specimens were subjected to three different wetting-drying cycles, considering NaCl solutions and CO2 atmospheres. Afterwards, chloride profiles and carbonation front were measured. Results show that carbonation has a direct influence on chloride penetration, decreasing it for cement mortars with 0% fly ash and increasing it for mortars with 40% cement replacement by fly ash. Moreover, the evolution of carbonation is also influenced by chloride presence, which decreases under the combined action.The authors thank the Foundation for Science and Technology (FCT) for supporting this research. The authors also thank the SECIL for making available cement used in this research and the CIMENTEIRA DO LOURO for providing the aggregates used. This work is co-financed by FEDER funds through the Competitively Factors Operational Programme - COMPETE and by national funds through FCT within the scope of the project POCI-01-0145-FEDER007136.info:eu-repo/semantics/publishedVersionUniversidade Federal do Estado do Rio de Janeiro (UNIRIO)Universidade do MinhoMalheiro, R.Camões, AiresMeira, G.Amorim, M. T.Gomes, C. J. P.Ferreira, R. M.2018-102018-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/57178engMalheiro R., Camões A., Meira G., Amorim M. T., Gomes C. J. P., Ferreira R. M. Behaviour of Cementitious Matrices Subjected to the Combined Action of Chloride Ions and Carbonation, Matéria, Vol. 23, Issue 3, doi:10.1590/s1517-707620180003.0496, 20181517-707610.1590/s1517-707620180003.0496http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762018000300415&lng=en&tlng=eninfo: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:RCAAP2023-07-21T12:41:15Zoai:repositorium.sdum.uminho.pt:1822/57178Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:38:10.588593Repositório 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 |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
title |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
spellingShingle |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation Malheiro, R. Carbonation chloride Fly ash Mortar Wetting-drying cycles Science & Technology |
title_short |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
title_full |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
title_fullStr |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
title_full_unstemmed |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
title_sort |
Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation |
author |
Malheiro, R. |
author_facet |
Malheiro, R. Camões, Aires Meira, G. Amorim, M. T. Gomes, C. J. P. Ferreira, R. M. |
author_role |
author |
author2 |
Camões, Aires Meira, G. Amorim, M. T. Gomes, C. J. P. Ferreira, R. M. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Malheiro, R. Camões, Aires Meira, G. Amorim, M. T. Gomes, C. J. P. Ferreira, R. M. |
dc.subject.por.fl_str_mv |
Carbonation chloride Fly ash Mortar Wetting-drying cycles Science & Technology |
topic |
Carbonation chloride Fly ash Mortar Wetting-drying cycles Science & Technology |
description |
Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has been frequently used in order to make the matrix more resistant to the action of chlorides. On the other hand, it is known that Ca(OH)2 existing in the matrix is consumed by the pozzolanic reactions, which makes easier the carbonation front advance. Therefore, this paper presents a study of the behavior of cementitious matrices, with and without fly ash, subjected to the combined action of chlorides and carbonation. Two different kinds of mortars were produced: reference (only cement CEM I 42.5R) and fly ash mortar (40% replacement of cement). After curing, the specimens were subjected to three different wetting-drying cycles, considering NaCl solutions and CO2 atmospheres. Afterwards, chloride profiles and carbonation front were measured. Results show that carbonation has a direct influence on chloride penetration, decreasing it for cement mortars with 0% fly ash and increasing it for mortars with 40% cement replacement by fly ash. Moreover, the evolution of carbonation is also influenced by chloride presence, which decreases under the combined action. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-10 2018-10-01T00:00:00Z |
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/1822/57178 |
url |
http://hdl.handle.net/1822/57178 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Malheiro R., Camões A., Meira G., Amorim M. T., Gomes C. J. P., Ferreira R. M. Behaviour of Cementitious Matrices Subjected to the Combined Action of Chloride Ions and Carbonation, Matéria, Vol. 23, Issue 3, doi:10.1590/s1517-707620180003.0496, 2018 1517-7076 10.1590/s1517-707620180003.0496 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762018000300415&lng=en&tlng=en |
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 |
Universidade Federal do Estado do Rio de Janeiro (UNIRIO) |
publisher.none.fl_str_mv |
Universidade Federal do Estado do Rio de Janeiro (UNIRIO) |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799132918269870080 |