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Article: Influence of Nitrate Corrosion Inhibitors on Phase Stability of Alkali-Activated Slag against Chloride Binding and Natural Carbonation

TitleInfluence of Nitrate Corrosion Inhibitors on Phase Stability of Alkali-Activated Slag against Chloride Binding and Natural Carbonation
Authors
KeywordsAlkali-activated binder
Carbonation
Chloride
Nitrate-based corrosion inhibitors
Slag
Issue Date2019
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/mt.html
Citation
Journal of Materials in Civil Engineering, 2019, v. 31 n. 8, p. article no. 04019160 How to Cite?
AbstractNitrate and nitrite-based corrosion inhibitors have been studied for decades for mitigating corrosion of steel embedded in ordinary portland cement (OPC) concrete; however, few studies are available regarding the effect of nitrate or nitrite on the performance of alkali-activated binders. This work, for the first time, investigates the influence of three nitrate-containing activators (i.e., sodium nitrate, magnesium nitrate, and aluminum nitrate, each mixed with sodium hydroxide solution) on the strength development, pore structure, phase assemblage, and phase stability of alkali-activated slag (AAS) binders upon exposure to chloride and natural carbonation. The results show that the addition of nitrate, regardless of its form, does not substantially alter the type of main reacted phases, i.e., calcium-aluminosilicate-hydrate (C-A-S-H) and Mg-Al layered double hydroxides (LDHs), in AAS; however, the addition of aluminum nitrate improves its compressive strength, boosts the formation of Ca-Al LDHs (AFm-type phase), and likely inserts nitrate anions in the interlayer of formed Ca-Al or Mg-Al LDHs. The findings suggest that the nitrate-intercalated Ca-Al LDHs and/or Mg-Al LDHs, if formed to some extent, can potentially release nitrate ions during chloride binding and carbonation, working as a smart corrosion inhibitor.
Persistent Identifierhttp://hdl.handle.net/10722/293546
ISSN
2020 Impact Factor: 3.266
2015 SCImago Journal Rankings: 0.965
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, H-
dc.contributor.authorCHEN, Z-
dc.date.accessioned2020-11-23T08:18:21Z-
dc.date.available2020-11-23T08:18:21Z-
dc.date.issued2019-
dc.identifier.citationJournal of Materials in Civil Engineering, 2019, v. 31 n. 8, p. article no. 04019160-
dc.identifier.issn0899-1561-
dc.identifier.urihttp://hdl.handle.net/10722/293546-
dc.description.abstractNitrate and nitrite-based corrosion inhibitors have been studied for decades for mitigating corrosion of steel embedded in ordinary portland cement (OPC) concrete; however, few studies are available regarding the effect of nitrate or nitrite on the performance of alkali-activated binders. This work, for the first time, investigates the influence of three nitrate-containing activators (i.e., sodium nitrate, magnesium nitrate, and aluminum nitrate, each mixed with sodium hydroxide solution) on the strength development, pore structure, phase assemblage, and phase stability of alkali-activated slag (AAS) binders upon exposure to chloride and natural carbonation. The results show that the addition of nitrate, regardless of its form, does not substantially alter the type of main reacted phases, i.e., calcium-aluminosilicate-hydrate (C-A-S-H) and Mg-Al layered double hydroxides (LDHs), in AAS; however, the addition of aluminum nitrate improves its compressive strength, boosts the formation of Ca-Al LDHs (AFm-type phase), and likely inserts nitrate anions in the interlayer of formed Ca-Al or Mg-Al LDHs. The findings suggest that the nitrate-intercalated Ca-Al LDHs and/or Mg-Al LDHs, if formed to some extent, can potentially release nitrate ions during chloride binding and carbonation, working as a smart corrosion inhibitor.-
dc.languageeng-
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/mt.html-
dc.relation.ispartofJournal of Materials in Civil Engineering-
dc.rightsJournal of Materials in Civil Engineering. Copyright © American Society of Civil Engineers.-
dc.rightsThis material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at [URL/link of abstract in the ASCE Library or Civil Engineering Database].-
dc.subjectAlkali-activated binder-
dc.subjectCarbonation-
dc.subjectChloride-
dc.subjectNitrate-based corrosion inhibitors-
dc.subjectSlag-
dc.titleInfluence of Nitrate Corrosion Inhibitors on Phase Stability of Alkali-Activated Slag against Chloride Binding and Natural Carbonation-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)MT.1943-5533.0002830-
dc.identifier.scopuseid_2-s2.0-85066139047-
dc.identifier.hkuros319186-
dc.identifier.volume31-
dc.identifier.issue8-
dc.identifier.spagearticle no. 04019160-
dc.identifier.epagearticle no. 04019160-
dc.identifier.isiWOS:000471820600028-
dc.publisher.placeUnited States-
dc.identifier.issnl0899-1561-

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