Alkali-silica reaction in waterglass-activated slag mortars incorporating fly ash and metakaolin

Shi, Zhenguo and Shi, Caijun and Zhang, Jian and Zhang, Zuhua and Ou, Zhihua (2018) Alkali-silica reaction in waterglass-activated slag mortars incorporating fly ash and metakaolin. Cement and Concrete Research, 108. pp. 10-19. ISSN 0008-8846

Abstract

Mitigation of alkali-silica reaction (ASR) in concrete is essential for durable and sustainable constructions. In conventional Portland cement-based concrete, alumina-rich supplementary cementitious materials such as low-calcium fly ash and metakaolin have been successfully used to mitigate ASR. Such effect has not been investigated for alkali-activated slag based materials. In this study, ASR expansion, changes in mortar weight and pore solution alkalinity have been studied. XRD and SEM/EDX have been employed to examine the reaction products and degradation of aggregates. The results demonstrate that there is an optimum dosage of fly ash to reduce ASR expansion of the studied mortars, whereas ASR expansion decreases with increasing the amount of metakaolin. It is found that the amount of ASR product formed is minor in the studied mortars with highest expansion. The pore solution alkalinity of the studied mortars is the main factor which controls the ASR in the alkali-activated slag mortars.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 23 Jan 2019 06:37
Last Modified: 24 Jan 2019 04:55
Uncontrolled Keywords: alkali-activated cement; alkali-silica reaction; slag; fly ash; metakaolin
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Identification Number or DOI: 10.1016/j.cemconres.2018.03.002
URI: http://eprints.usq.edu.au/id/eprint/35293

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