Relationship between rheological property and early age-microstructure building up of alkali-activated slag
Article
Article Title | Relationship between rheological property and early age-microstructure building up of alkali-activated slag |
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ERA Journal ID | 4883 |
Article Category | Article |
Authors | Lu, Cuifang, Zhang, Zuhua, Hu, Jie, Yu, Qijun and Shi, Caijun |
Journal Title | Composites Part B: Engineering |
Journal Citation | 247, pp. 1-19 |
Article Number | 110271 |
Number of Pages | 19 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-8368 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compositesb.2022.110271 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1359836822006448 |
Abstract | This paper investigated the effects of temperature and activator concentration on the rheological property of slag activated by ternary activator of Na2O·2SiO2–NaOH–Na2CO3. New insight on the time-dependence features of microstructure building up of alkali-activated slag (AAS) paste was revealed via multiple characterization techniques. Three featured periods are distinguished in the first 3 h reaction. The time-dependent rheological behavior of AAS is largely controlled by the formation of gel network, where significant amount of free water is trapped in the voids or interlayers. By 1H NMR analysis, it is confirmed that a small peak of immovable water always lags behind the peak value of mobile water, indicating that the early gel agglomerates trap and adsorb more mobile water after an intensive polycondensation reaction. Furthermore, similar Al/Si and Ca/Si ratios of early gels are detected, while slightly higher Al/Si ratio is found in the gel agglomerates with higher crosslinking degree. This confirms the important role of Al, that is more Al increasing the polymerization degree of early gels, leading to stronger interactions between nano gel particles, and thereby trigging the rapid development of elasticity and stiffness of the initial matrix. |
Keywords | 1 H NMR; Gel properties; Microstructure; Pore solution; Rheology; Water state |
ANZSRC Field of Research 2020 | 4016. Materials engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Funder | National Natural Science Foundation of China |
Byline Affiliations | Hunan University, China |
South China University of Technology, China | |
Library Services |
https://research.usq.edu.au/item/yy407/relationship-between-rheological-property-and-early-age-microstructure-building-up-of-alkali-activated-slag
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