Autogenous and drying shrinkage of alkali‐activated slag mortars
Article
Article Title | Autogenous and drying shrinkage of alkali‐activated slag mortars |
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ERA Journal ID | 4948 |
Article Category | Article |
Authors | Hu, Xiang, Shi, Caijun, Zhang, Zuhua and Hu, Zhangli |
Journal Title | Journal of the American Ceramic Society |
Journal Citation | 102 (8), pp. 4963-4975 |
Number of Pages | 13 |
Year | 2019 |
Place of Publication | United States |
ISSN | 0002-7820 |
1551-2916 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/jace.16349 |
Web Address (URL) | https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/jace.16349 |
Abstract | Shrinkage of alkali‐activated slag (AAS) cement is a critical issue for its industrial application. This study investigated the mechanisms and effectiveness of shrinkage‐reducing agent (SRA) and magnesia expansive agent on reducing autogenous and drying shrinkage of AAS mortars that were activated by liquid sodium silicate (LSS) solution with modulus (SiO2/Na2O molar ratio) of 0‐1.5. The results showed that the autogenous shrinkage of AAS mortars increased with the increase of LSS modulus from 0 to 0.5, then decreased as modulus increased up to 1.5. The drying shrinkage consistently increased with the increase in the modulus of LSS. The oxyalkylene alcohol‐based SRA could significantly reduce the autogenous and drying shrinkage of AAS mortars while the magnesia expensive agent was comparatively less effective. The autogenous shrinkage of AAS mortars was inversely proportional to the internal relative humidity, while the drying shrinkage was more related to the mass loss of samples. Mathematical models were established to describe the autogenous and drying shrinkage behavior of AAS mortars. |
Keywords | additives, alkali activation, alkali‐activated slag, shrinkage |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Hunan University, China |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID DP1006016 |
Funding source | Australian Research Council (ARC) Grant ID DE1006382 |
https://research.usq.edu.au/item/q586x/autogenous-and-drying-shrinkage-of-alkali-activated-slag-mortars
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