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Article: Corrosion behavior of steel rebar embedded in hybrid CNTs-OH/polyvinyl alcohol modified concrete under accelerated chloride attack

TitleCorrosion behavior of steel rebar embedded in hybrid CNTs-OH/polyvinyl alcohol modified concrete under accelerated chloride attack
Authors
KeywordsAccelerated chloride attack
Hydroxyl carbon nanotube
Impressed voltage technique
Polyvinyl alcohol
Steel reinforced concrete
Issue Date2019
Citation
Cement and Concrete Composites, 2019, v. 100, p. 120-129 How to Cite?
AbstractThis study evaluated the mono and hybrid effects of hydroxyl carbon nanotubes (CNTs-OH) and polyvinyl alcohol (PVA) on the corrosion behavior of steel rebars embedded in concrete under accelerated chloride attack by an impressed voltage technique. The contents of CNTs-OH and PVA were fixed at 0.5% and 1% by weight of cement, respectively. Mechanical tests showed that hybrid CNTs-OH/PVA improved the flexural strength and compressive strength by 20% and 9%, respectively. The Mercury Intrusion Porosimetry test showed that adding CNTs-OH/PVA reduced the total porosity and macro-pore content of concrete by 29.9% and 83.2% over the control concrete, respectively. The impressed voltage corrosion test indicated that hybrid CNTs-OH/PVA significantly delayed the deterioration progress of the steel rebar in concrete, as the corrosion level of the steel rebar decreased by 94% and the exposure time increased by 60% before the generation of the surface crack compared to those of the control concrete. The mechanisms for the hybrid effects of CNTs-OH and PVA on enhancing the steel corrosion resistance in concrete include: 1) uniform dispersion of CNTs-OH in PVA colloid; 2) pore-filling effect of both CNTs-OH and PVA; and 3) PVA coated CNTs-OH form electric capacitors to restraint the transport of free ions. The findings in this study reveal the potential of hybrid CNTs-OH/PVA modifiers to improve the corrosion resistance of steel rebars in concrete.
Persistent Identifierhttp://hdl.handle.net/10722/334585
ISSN
2023 Impact Factor: 10.8
2023 SCImago Journal Rankings: 3.650
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, Zhongkun-
dc.contributor.authorYu, Jing-
dc.contributor.authorLi, Gengying-
dc.contributor.authorZhang, Min-
dc.contributor.authorLeung, Christopher K.Y.-
dc.date.accessioned2023-10-20T06:49:11Z-
dc.date.available2023-10-20T06:49:11Z-
dc.date.issued2019-
dc.identifier.citationCement and Concrete Composites, 2019, v. 100, p. 120-129-
dc.identifier.issn0958-9465-
dc.identifier.urihttp://hdl.handle.net/10722/334585-
dc.description.abstractThis study evaluated the mono and hybrid effects of hydroxyl carbon nanotubes (CNTs-OH) and polyvinyl alcohol (PVA) on the corrosion behavior of steel rebars embedded in concrete under accelerated chloride attack by an impressed voltage technique. The contents of CNTs-OH and PVA were fixed at 0.5% and 1% by weight of cement, respectively. Mechanical tests showed that hybrid CNTs-OH/PVA improved the flexural strength and compressive strength by 20% and 9%, respectively. The Mercury Intrusion Porosimetry test showed that adding CNTs-OH/PVA reduced the total porosity and macro-pore content of concrete by 29.9% and 83.2% over the control concrete, respectively. The impressed voltage corrosion test indicated that hybrid CNTs-OH/PVA significantly delayed the deterioration progress of the steel rebar in concrete, as the corrosion level of the steel rebar decreased by 94% and the exposure time increased by 60% before the generation of the surface crack compared to those of the control concrete. The mechanisms for the hybrid effects of CNTs-OH and PVA on enhancing the steel corrosion resistance in concrete include: 1) uniform dispersion of CNTs-OH in PVA colloid; 2) pore-filling effect of both CNTs-OH and PVA; and 3) PVA coated CNTs-OH form electric capacitors to restraint the transport of free ions. The findings in this study reveal the potential of hybrid CNTs-OH/PVA modifiers to improve the corrosion resistance of steel rebars in concrete.-
dc.languageeng-
dc.relation.ispartofCement and Concrete Composites-
dc.subjectAccelerated chloride attack-
dc.subjectHydroxyl carbon nanotube-
dc.subjectImpressed voltage technique-
dc.subjectPolyvinyl alcohol-
dc.subjectSteel reinforced concrete-
dc.titleCorrosion behavior of steel rebar embedded in hybrid CNTs-OH/polyvinyl alcohol modified concrete under accelerated chloride attack-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.cemconcomp.2019.02.013-
dc.identifier.scopuseid_2-s2.0-85064198236-
dc.identifier.volume100-
dc.identifier.spage120-
dc.identifier.epage129-
dc.identifier.isiWOS:000468708900012-

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