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Article: Mechanism of sulfate attack on alkali-activated slag: The role of activator composition

TitleMechanism of sulfate attack on alkali-activated slag: The role of activator composition
Authors
KeywordsAlkali-activated slag
Sulfate attack
Mg-Al layered double hydroxides
Chemical durability
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres
Citation
Cement and Concrete Research, 2019, v. 125, p. article no. 105868 How to Cite?
AbstractIn this work, the degradation mechanisms of alkali-activated slag (AAS), prepared with various activator compositions, exposed to 5% Na2SO4 and MgSO4 solutions are studied. The results show that upon Na2SO4 attack, little ettringite formation and compositional alteration occur in AAS with little length expansion. However, upon MgSO4 attack, brucite, gypsum, and magnesium-aluminosilicate-hydrate (M-A-S-H) are observed in altered layers of hardened AAS pastes. The sulfate-activated slag shows a weaker resistance against MgSO4 attack than NaOH- and Na2CO3-counterparts due to a lower pH value in pore solution and thus absence of brucite protective layer. The reacted products in hardened AAS pastes have a high capacity against dealumination in sulfate environments, contributing to superior sulfate resistance over traditional ordinary Portland cement (OPC).
Persistent Identifierhttp://hdl.handle.net/10722/293550
ISSN
2020 Impact Factor: 10.933
2020 SCImago Journal Rankings: 4.628
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, H-
dc.contributor.authorCHEN, Z-
dc.contributor.authorHuang, L-
dc.date.accessioned2020-11-23T08:18:25Z-
dc.date.available2020-11-23T08:18:25Z-
dc.date.issued2019-
dc.identifier.citationCement and Concrete Research, 2019, v. 125, p. article no. 105868-
dc.identifier.issn0008-8846-
dc.identifier.urihttp://hdl.handle.net/10722/293550-
dc.description.abstractIn this work, the degradation mechanisms of alkali-activated slag (AAS), prepared with various activator compositions, exposed to 5% Na2SO4 and MgSO4 solutions are studied. The results show that upon Na2SO4 attack, little ettringite formation and compositional alteration occur in AAS with little length expansion. However, upon MgSO4 attack, brucite, gypsum, and magnesium-aluminosilicate-hydrate (M-A-S-H) are observed in altered layers of hardened AAS pastes. The sulfate-activated slag shows a weaker resistance against MgSO4 attack than NaOH- and Na2CO3-counterparts due to a lower pH value in pore solution and thus absence of brucite protective layer. The reacted products in hardened AAS pastes have a high capacity against dealumination in sulfate environments, contributing to superior sulfate resistance over traditional ordinary Portland cement (OPC).-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres-
dc.relation.ispartofCement and Concrete Research-
dc.subjectAlkali-activated slag-
dc.subjectSulfate attack-
dc.subjectMg-Al layered double hydroxides-
dc.subjectChemical durability-
dc.titleMechanism of sulfate attack on alkali-activated slag: The role of activator composition-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.emailHuang, L: huangle@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.cemconres.2019.105868-
dc.identifier.scopuseid_2-s2.0-85071448806-
dc.identifier.hkuros319199-
dc.identifier.volume125-
dc.identifier.spagearticle no. 105868-
dc.identifier.epagearticle no. 105868-
dc.identifier.isiWOS:000503086100007-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0008-8846-

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