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Article: Natural carbonation-induced phase and molecular evolution of alkali-activated slag: Effect of activator composition and curing temperature

TitleNatural carbonation-induced phase and molecular evolution of alkali-activated slag: Effect of activator composition and curing temperature
Authors
KeywordsNatural carbonation
Alkali-activated slag
Durability
Concrete materials
Curing temperature
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat
Citation
Construction and Building Materials, 2020, v. 248, p. article no. 118726 How to Cite?
AbstractIn this work, the evolution of reacted phase assemblage and molecular structure of alkali-activated slag (AAS) exposed to atmospheric natural carbonation is studied. The hardened AAS pastes with various activator types (i.e., sodium hydroxide, sodium carbonate, sodium sulfate, potassium hydroxide, and potassium carbonate solutions) and cured under two temperature conditions (20 °C and 80 °C) are evaluated. The results show that natural carbonation leads to a strong decalcification and silicate polymerization of calcium-aluminosilicate-hydrate (C-A-S-H) and precipitation of various calcium carbonate polymorphs depending on activator composition. The sulfate-activated slag shows the poorest carbonation resistance likely due to its limited CO2 absorption capacity, manifested with the formation of calcium carbonate polymorphs, gypsum, gibbsite, and calcium-deficit aluminosilicate gels. While high-temperature curing tends to increase the crystallinity level of C-A-S-H, it has little effect on its carbonation resistance in terms of phase and molecular stability.
Persistent Identifierhttp://hdl.handle.net/10722/293557
ISSN
2023 Impact Factor: 7.4
2023 SCImago Journal Rankings: 1.999
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, H-
dc.contributor.authorCai, R-
dc.contributor.authorTIAN, Z-
dc.date.accessioned2020-11-23T08:18:31Z-
dc.date.available2020-11-23T08:18:31Z-
dc.date.issued2020-
dc.identifier.citationConstruction and Building Materials, 2020, v. 248, p. article no. 118726-
dc.identifier.issn0950-0618-
dc.identifier.urihttp://hdl.handle.net/10722/293557-
dc.description.abstractIn this work, the evolution of reacted phase assemblage and molecular structure of alkali-activated slag (AAS) exposed to atmospheric natural carbonation is studied. The hardened AAS pastes with various activator types (i.e., sodium hydroxide, sodium carbonate, sodium sulfate, potassium hydroxide, and potassium carbonate solutions) and cured under two temperature conditions (20 °C and 80 °C) are evaluated. The results show that natural carbonation leads to a strong decalcification and silicate polymerization of calcium-aluminosilicate-hydrate (C-A-S-H) and precipitation of various calcium carbonate polymorphs depending on activator composition. The sulfate-activated slag shows the poorest carbonation resistance likely due to its limited CO2 absorption capacity, manifested with the formation of calcium carbonate polymorphs, gypsum, gibbsite, and calcium-deficit aluminosilicate gels. While high-temperature curing tends to increase the crystallinity level of C-A-S-H, it has little effect on its carbonation resistance in terms of phase and molecular stability.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/conbuildmat-
dc.relation.ispartofConstruction and Building Materials-
dc.subjectNatural carbonation-
dc.subjectAlkali-activated slag-
dc.subjectDurability-
dc.subjectConcrete materials-
dc.subjectCuring temperature-
dc.titleNatural carbonation-induced phase and molecular evolution of alkali-activated slag: Effect of activator composition and curing temperature-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.emailCai, R: rjcai@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.conbuildmat.2020.118726-
dc.identifier.scopuseid_2-s2.0-85082176256-
dc.identifier.hkuros319224-
dc.identifier.volume248-
dc.identifier.spagearticle no. 118726-
dc.identifier.epagearticle no. 118726-
dc.identifier.isiWOS:000531081200085-
dc.publisher.placeNetherlands-
dc.identifier.issnl0950-0618-

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