Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation

Detalhes bibliográficos
Autor(a) principal: Malheiro, R.
Data de Publicação: 2018
Outros Autores: Camões, Aires, Meira, G., Amorim, M. T., Gomes, C. J. P., Ferreira, R. M.
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.
id RCAP_344c921801bef5deedc527bd0907487b
oai_identifier_str oai:repositorium.sdum.uminho.pt:1822/57178
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling 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
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_ 1799132918269870080