Compressive strength development and shrinkage of alkali-activated fly ash–slag blends associated with efflorescence
Article
Article Title | Compressive strength development and shrinkage of alkali-activated fly ash–slag blends associated with efflorescence |
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ERA Journal ID | 4258 |
Article Category | Article |
Authors | Yao, Xiao (Author), Yang, Tao (Author) and Zhang, Zuhua (Author) |
Journal Title | Materials and Structures |
Journal Citation | 49 (7), pp. 2907-2918 |
Number of Pages | 12 |
Year | 2016 |
Place of Publication | Germany |
ISSN | 1359-5997 |
1871-6873 | |
Digital Object Identifier (DOI) | https://doi.org/10.1617/s11527-015-0694-3 |
Web Address (URL) | http://download.springer.com/static/pdf/757/art%253A10.1617%252Fs11527-015-0694-3.pdf?originUrl=http%3A%2F%2Flink.springer.com%2Farticle%2F10.1617%2Fs11527-015-0694-3&token2=exp=1491198790~acl=%2Fstatic%2Fpdf%2F757%2Fart%25253A10.1617%25252Fs11527-015-069 |
Abstract | This study reports the changes in the compressive strength and shrinkage property of alkali-activated fly ash and slag (AAFS) blends associated with efflorescence. The AAFS specimens cured in air for different periods were further aged under the following three conditions: bottom-contact with water, fully immersed in water and in air. The second condition, i.e., bottom in contact with water, was used to accelerate efflorescence of AAFS. The efflorescence of the AAFS binders was dependent on the reaction extent of the solid precursors. A higher reaction extent present in the binder by extending initial-curing age can reduce efflorescence rate. The incorporation of low percentage of slag (lower than 50 wt%) in the AAFS binders has little influence on the efflorescence potential, while with the increased contents of slag higher than 50 %, the binders exhibit more rapid efflorescence than the 100 % fly ash binders. The efflorescence led to the strength loss because of the formation of carbonate crystals in the binder and the damage of the microstructure. The linear shrinkage of the binders was also related to efflorescence and alkali leaching. The slag addition can reduce the negative effects of efflorescence and alkali leaching on the absolute compressive strength and shrinkage of the binders. |
Keywords | alkali activated cement; efflorescence; fly ash; pore structure; slag |
ANZSRC Field of Research 2020 | 401699. Materials engineering not elsewhere classified |
400505. Construction materials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Nanjing University of Technology, China |
Centre of Excellence in Engineered Fibre Composites | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID LP130101016 |
https://research.usq.edu.au/item/q3yy8/compressive-strength-development-and-shrinkage-of-alkali-activated-fly-ash-slag-blends-associated-with-efflorescence
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