Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars
Article
Article Title | Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars |
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ERA Journal ID | 4164 |
Article Category | Article |
Authors | Shi, Zhenguo (Author), Shi, Caijun (Author), Wan, Shu (Author) and Zhang, Zuhua (Author) |
Journal Title | Cement and Concrete Research |
Journal Citation | 111, pp. 104-115 |
Number of Pages | 12 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | Oxford, United Kingdom |
ISSN | 0008-8846 |
1873-3948 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconres.2018.06.005 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0008884618302047#ac0005 |
Abstract | 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. |
Keywords | alkali-aggregate reaction; alkali activated cement; waterglass; silicate modulus; pore solution alkalinity |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Hunan University, China |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID DP160104149; DE170101070). |
https://research.usq.edu.au/item/q4zq2/effects-of-alkali-dosage-and-silicate-modulus-on-alkali-silica-reaction-in-alkali-activated-slag-mortars
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