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Article: Mechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars
Title | Mechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars |
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Authors | |
Issue Date | 2019 |
Publisher | Japan 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? |
Abstract | Alkali-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. |
Description | Link to Free access |
Persistent Identifier | http://hdl.handle.net/10722/293742 |
ISSN | 2023 Impact Factor: 1.6 2023 SCImago Journal Rankings: 0.611 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Ye, H | - |
dc.contributor.author | CHEN, Z | - |
dc.date.accessioned | 2020-11-23T08:21:10Z | - |
dc.date.available | 2020-11-23T08:21:10Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Journal of Advanced Concrete Technology, 2019, v. 17 n. 6, p. 269-281 | - |
dc.identifier.issn | 1346-8014 | - |
dc.identifier.uri | http://hdl.handle.net/10722/293742 | - |
dc.description | Link to Free access | - |
dc.description.abstract | Alkali-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.language | eng | - |
dc.publisher | Japan Concrete Institute. The Journal's web site is located at http://www.j-act.org/ | - |
dc.relation.ispartof | Journal of Advanced Concrete Technology | - |
dc.title | Mechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars | - |
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 | 10.3151/jact.17.269 | - |
dc.identifier.hkuros | 319187 | - |
dc.identifier.volume | 17 | - |
dc.identifier.issue | 6 | - |
dc.identifier.spage | 269 | - |
dc.identifier.epage | 281 | - |
dc.identifier.isi | WOS:000473057600001 | - |
dc.publisher.place | Japan | - |
dc.identifier.issnl | 1346-8014 | - |