Reaction mechanism of sulfate attack on alkali-activated slag/fly ash cements
Article
Article Title | Reaction mechanism of sulfate attack on alkali-activated slag/fly ash cements |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Zhang, Jian, Shi, Caijun, Zhang, Zuhua and Hu, Xiang |
Journal Title | Construction and Building Materials |
Journal Citation | 318 |
Article Number | 126052 |
Number of Pages | 15 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2021.126052 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0950061821037843 |
Abstract | In this work, the effects of slag/fly ash ratios, Na2O concentration, and silicate modulus (Ms) of activators on the reaction mechanism of sulfate attack on alkali-activated slag/fly ash cements are elucidated by XRD, FTIR, and TG/DTG analysis. To accelerate the sulfate attack process, the alkali-activated cements (AACs) were crushed into particle samples before immersion in the Na2SO4 and MgSO4 solutions. The results show that upon the Na2SO4 attack, the C-A-S-H gel structures of AACs do not change basically. However, the MgSO4 attack on AACs is severe due to the dissolution of alkali and the intrusion of Mg2+. Gypsum is the main product in AACs upon the MgSO4 attack, and the amount of brucite decreases with the incorporation of fly ash. The NaOH-activated slag (Ms = 0) has a relatively higher MgSO4 resistance compared with the Na2SiO3-activated slag, while it is the opposite when the fly ash replacement level increases to 80%. |
Keywords | Activators; Alkali-activated cements; Fly ash; Slag; Sulfate attack |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 3302. Building |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Funder | National Natural Science Foundation of China |
Byline Affiliations | Guangdong Provincial Transport Planning and Research Center, China |
Hunan University, China |
https://research.usq.edu.au/item/yy336/reaction-mechanism-of-sulfate-attack-on-alkali-activated-slag-fly-ash-cements
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