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Article: Mechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars

TitleMechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars
Authors
Issue Date2019
PublisherJapan Concrete Institute. The Journal's web site is located at http://www.j-act.org/
Citation
Journal of Advanced Concrete Technology, 2019, v. 17 n. 6, p. 269-281 How to Cite?
AbstractAlkali-activation of high-volume fly ash (HVFA) is a viable approach to produce durable cementitious binders with faster and stronger strength development than its water-activated counterparts. However, the use of alkaline activator increases the risk of alkali-silica reaction (ASR) in these systems. In this work, the compressive strength and ASR susceptibility of alkali-activated fly ash-OPC mortars containing reactive aggregate are studied. The results show that in comparison to plain water-activated fly ash-OPC mixture, the alkali incorporation at a low concentration improves strength development only when the fly ash replacement ratio is higher than about 80%; however, excessive alkali has an adverse influence. Regardless of activator type and dosage, alkali-activated fly ash-OPC mortars are ASR innocent as assessed in the accelerated mortar bar test and scanning electron microscopic analysis, provided that the fly ash percentage higher than about 40%. The mechanism for the insignificant ASR expansion and damage in alkali-activated HVFA mortars is likely attributed to the low calcium content that prevents gelation of deleterious and expansive ASR products.
DescriptionLink to Free access
Persistent Identifierhttp://hdl.handle.net/10722/293742
ISSN
2020 Impact Factor: 1.768
2020 SCImago Journal Rankings: 0.693
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYe, H-
dc.contributor.authorCHEN, Z-
dc.date.accessioned2020-11-23T08:21:10Z-
dc.date.available2020-11-23T08:21:10Z-
dc.date.issued2019-
dc.identifier.citationJournal of Advanced Concrete Technology, 2019, v. 17 n. 6, p. 269-281-
dc.identifier.issn1346-8014-
dc.identifier.urihttp://hdl.handle.net/10722/293742-
dc.descriptionLink to Free access-
dc.description.abstractAlkali-activation of high-volume fly ash (HVFA) is a viable approach to produce durable cementitious binders with faster and stronger strength development than its water-activated counterparts. However, the use of alkaline activator increases the risk of alkali-silica reaction (ASR) in these systems. In this work, the compressive strength and ASR susceptibility of alkali-activated fly ash-OPC mortars containing reactive aggregate are studied. The results show that in comparison to plain water-activated fly ash-OPC mixture, the alkali incorporation at a low concentration improves strength development only when the fly ash replacement ratio is higher than about 80%; however, excessive alkali has an adverse influence. Regardless of activator type and dosage, alkali-activated fly ash-OPC mortars are ASR innocent as assessed in the accelerated mortar bar test and scanning electron microscopic analysis, provided that the fly ash percentage higher than about 40%. The mechanism for the insignificant ASR expansion and damage in alkali-activated HVFA mortars is likely attributed to the low calcium content that prevents gelation of deleterious and expansive ASR products.-
dc.languageeng-
dc.publisherJapan Concrete Institute. The Journal's web site is located at http://www.j-act.org/-
dc.relation.ispartofJournal of Advanced Concrete Technology-
dc.titleMechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars-
dc.typeArticle-
dc.identifier.emailYe, H: hlye@hku.hk-
dc.identifier.authorityYe, H=rp02379-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3151/jact.17.269-
dc.identifier.hkuros319187-
dc.identifier.volume17-
dc.identifier.issue6-
dc.identifier.spage269-
dc.identifier.epage281-
dc.identifier.isiWOS:000473057600001-
dc.publisher.placeJapan-
dc.identifier.issnl1346-8014-

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