Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

Detalhes bibliográficos
Autor(a) principal: Triana,Víctor
Data de Publicação: 2013
Outros Autores: Lizarazo-Marriaga,Juan, Flórez,Jhon Olaya
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000600035
Resumo: Since Corrosion of reinforcing steel in concrete is the cause of major economic losses, Portland cement has been traditionally replaced by cements blended with pozzalanic materials, most of which have been found to reduce the corrosion of steel. This paper shows the results of an experimental research aimed to investigate the corrosion of reinforcement in mortar using electrochemical impedance spectroscopy (EIS). For this, concrete laboratory samples containing a 0.0055 m steel bar and prepared with just ordinary Portland cement (OPC) and metakaolin at a replacement level of 20% were analyzed. In order to accelerate the steel corrosion process, all the samples were kept in a 3% NaCl solution and a constant anodic electrical potential was applied. Variations in the water to cementitious material ratio (0.5 and 0.6) and metakaolin proportion were analyzed, while the cementitious material to sand ratio was kept constant at 1:2.25 in all of the specimens. The results showed a reduction in corrosion rates when metakaolin was used as a blending admixture, especially at water to cementitious material ratio of 0.5.
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spelling Steel corrosion assessment by electrochemical impedance on metakaolin blended mortarselectrochemical impedance spectroscopypozzolanic materialsmetakaolinreinforcement corrosionSince Corrosion of reinforcing steel in concrete is the cause of major economic losses, Portland cement has been traditionally replaced by cements blended with pozzalanic materials, most of which have been found to reduce the corrosion of steel. This paper shows the results of an experimental research aimed to investigate the corrosion of reinforcement in mortar using electrochemical impedance spectroscopy (EIS). For this, concrete laboratory samples containing a 0.0055 m steel bar and prepared with just ordinary Portland cement (OPC) and metakaolin at a replacement level of 20% were analyzed. In order to accelerate the steel corrosion process, all the samples were kept in a 3% NaCl solution and a constant anodic electrical potential was applied. Variations in the water to cementitious material ratio (0.5 and 0.6) and metakaolin proportion were analyzed, while the cementitious material to sand ratio was kept constant at 1:2.25 in all of the specimens. The results showed a reduction in corrosion rates when metakaolin was used as a blending admixture, especially at water to cementitious material ratio of 0.5.ABM, ABC, ABPol2013-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000600035Materials Research v.16 n.6 2013reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392013005000178info:eu-repo/semantics/openAccessTriana,VíctorLizarazo-Marriaga,JuanFlórez,Jhon Olayaeng2013-12-13T00:00:00Zoai:scielo:S1516-14392013000600035Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2013-12-13T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
title Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
spellingShingle Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
Triana,Víctor
electrochemical impedance spectroscopy
pozzolanic materials
metakaolin
reinforcement corrosion
title_short Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
title_full Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
title_fullStr Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
title_full_unstemmed Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
title_sort Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
author Triana,Víctor
author_facet Triana,Víctor
Lizarazo-Marriaga,Juan
Flórez,Jhon Olaya
author_role author
author2 Lizarazo-Marriaga,Juan
Flórez,Jhon Olaya
author2_role author
author
dc.contributor.author.fl_str_mv Triana,Víctor
Lizarazo-Marriaga,Juan
Flórez,Jhon Olaya
dc.subject.por.fl_str_mv electrochemical impedance spectroscopy
pozzolanic materials
metakaolin
reinforcement corrosion
topic electrochemical impedance spectroscopy
pozzolanic materials
metakaolin
reinforcement corrosion
description Since Corrosion of reinforcing steel in concrete is the cause of major economic losses, Portland cement has been traditionally replaced by cements blended with pozzalanic materials, most of which have been found to reduce the corrosion of steel. This paper shows the results of an experimental research aimed to investigate the corrosion of reinforcement in mortar using electrochemical impedance spectroscopy (EIS). For this, concrete laboratory samples containing a 0.0055 m steel bar and prepared with just ordinary Portland cement (OPC) and metakaolin at a replacement level of 20% were analyzed. In order to accelerate the steel corrosion process, all the samples were kept in a 3% NaCl solution and a constant anodic electrical potential was applied. Variations in the water to cementitious material ratio (0.5 and 0.6) and metakaolin proportion were analyzed, while the cementitious material to sand ratio was kept constant at 1:2.25 in all of the specimens. The results showed a reduction in corrosion rates when metakaolin was used as a blending admixture, especially at water to cementitious material ratio of 0.5.
publishDate 2013
dc.date.none.fl_str_mv 2013-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000600035
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000600035
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392013005000178
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.16 n.6 2013
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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