Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars

Shi, Zhenguo and Shi, Caijun and Wan, Shu and Zhang, Zuhua (2018) Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars. Cement and Concrete Research, 111. pp. 104-115. ISSN 0008-8846


The effects of silicate modulus and alkali dosage on alkali-silica reaction (ASR) of alkali-activated slag (AAS) mortars are investigated under accelerated mortar bar testing conditions as specified in ASTM C1260. At a given alkali dosage, an intermediate silicate modulus with respect to highest ASR expansion is observed, which increases from 1.0 to >2.0 with increase of alkali dosage. The effect of silicate modulus on ASR expansion is found to be governed by the pore solution alkalinity. At a given higher silicate modulus such as 1.5 and 2.0 at 14 day, the ASR expansion tends to increase with increase of alkali dosage, whereas it decreases with increase of alkali dosage at a given lower silicate modulus such as 0–0.5 at 28 day. The mechanism governing the effect of alkali dosage on ASR expansion is more complicated and cannot be explained by only the pore solution alkalinity.

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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 - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 23 Jan 2019 06:25
Last Modified: 24 Jan 2019 04:56
Uncontrolled Keywords: alkali-aggregate reaction; alkali activated cement; waterglass; silicate modulus; pore solution alkalinity
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Funding Details:
Identification Number or DOI: https://doi.org/10.1016/j.cemconres.2018.06.005
URI: http://eprints.usq.edu.au/id/eprint/35288

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