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- Publisher Website: 10.1016/j.cemconres.2021.106398
- Scopus: eid_2-s2.0-85101009361
- WOS: WOS:000634617900028
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Article: Sequestration and release of nitrite and nitrate in alkali-activated slag: A route toward smart corrosion control
Title | Sequestration and release of nitrite and nitrate in alkali-activated slag: A route toward smart corrosion control |
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Authors | |
Keywords | Corrosion of steel Concrete durability Alkali-activated slag Corrosion inhibitor Smart materials |
Issue Date | 2021 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres |
Citation | Cement and Concrete Research, 2021, v. 143, p. article no. 106398 How to Cite? |
Abstract | Intercalating the corrosion inhibitive ions in hydrotalcite is a promising approach to improve the long-term efficiency of inhibitors in corrosion protection of steel in reinforced concrete. In this work, the potential of autogenously generating nitrite- and nitrate-intercalated hydrotalcite in alkali-activated slag (AAS) is investigated. The results show that the added nitrite and nitrate ions are preferably uptaken in the interlayer structure of hydrotalcite in AAS, and the sequestered nitrite and nitrate are released upon chloride exposure in seawater and NaCl solution. The incorporation of nitrite and nitrate has little detrimental effects on the chloride binding capacity of AAS but slightly enhances the chloride ingress due to the pore coarsening effect. Similar to ordinary Portland cement (OPC), AAS is more permeable to the chloride in seawater than NaCl solution. However, unlike the release of bound chloride contributed by ettringite formation in seawater-exposed OPC, the enhanced chloride ingress in seawater-exposed AAS is primarily attributed to the aggravated pH reduction at the exposure front due to brucite formation. This study contributes to the design of alkali-activated binders with a smart inhibitor releasing ability for mitigating corrosion of steel in concrete. |
Persistent Identifier | http://hdl.handle.net/10722/298761 |
ISSN | 2023 Impact Factor: 10.9 2023 SCImago Journal Rankings: 4.781 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | CHEN, Z | - |
dc.contributor.author | Ye, H | - |
dc.date.accessioned | 2021-04-12T03:03:00Z | - |
dc.date.available | 2021-04-12T03:03:00Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Cement and Concrete Research, 2021, v. 143, p. article no. 106398 | - |
dc.identifier.issn | 0008-8846 | - |
dc.identifier.uri | http://hdl.handle.net/10722/298761 | - |
dc.description.abstract | Intercalating the corrosion inhibitive ions in hydrotalcite is a promising approach to improve the long-term efficiency of inhibitors in corrosion protection of steel in reinforced concrete. In this work, the potential of autogenously generating nitrite- and nitrate-intercalated hydrotalcite in alkali-activated slag (AAS) is investigated. The results show that the added nitrite and nitrate ions are preferably uptaken in the interlayer structure of hydrotalcite in AAS, and the sequestered nitrite and nitrate are released upon chloride exposure in seawater and NaCl solution. The incorporation of nitrite and nitrate has little detrimental effects on the chloride binding capacity of AAS but slightly enhances the chloride ingress due to the pore coarsening effect. Similar to ordinary Portland cement (OPC), AAS is more permeable to the chloride in seawater than NaCl solution. However, unlike the release of bound chloride contributed by ettringite formation in seawater-exposed OPC, the enhanced chloride ingress in seawater-exposed AAS is primarily attributed to the aggravated pH reduction at the exposure front due to brucite formation. This study contributes to the design of alkali-activated binders with a smart inhibitor releasing ability for mitigating corrosion of steel in concrete. | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres | - |
dc.relation.ispartof | Cement and Concrete Research | - |
dc.subject | Corrosion of steel | - |
dc.subject | Concrete durability | - |
dc.subject | Alkali-activated slag | - |
dc.subject | Corrosion inhibitor | - |
dc.subject | Smart materials | - |
dc.title | Sequestration and release of nitrite and nitrate in alkali-activated slag: A route toward smart corrosion control | - |
dc.type | Article | - |
dc.identifier.email | Ye, H: hlye@hku.hk | - |
dc.identifier.authority | Ye, H=rp02379 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cemconres.2021.106398 | - |
dc.identifier.scopus | eid_2-s2.0-85101009361 | - |
dc.identifier.hkuros | 322070 | - |
dc.identifier.volume | 143 | - |
dc.identifier.spage | article no. 106398 | - |
dc.identifier.epage | article no. 106398 | - |
dc.identifier.isi | WOS:000634617900028 | - |
dc.publisher.place | United Kingdom | - |