Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 3
Abstract
To evaluate the feasibility of mixing saline underground water (SUW) in the preparation of cemented fine tailings backfill (CFTB), the compressive strength, pore fluid pH, slag hydration degree, hydration phase composition/structure, and pore morphology of CFTB have been tested. The binder used was a one-part alkali-activated slag composed of ground-granulated blast furnace slag (67.8% by weight) as precursor and desulfurized gypsum (25.9% by weight) and hydrated lime (6.3% by weight) as composite activator. The results showed that using SUW instead of deionized water as mixing medium had both negative and positive effects on the strength development of CFTB, depending on the curing time. At the very early ages (1–3 days), mixing SUW resulted in a decrease of the pore solution pH, which is due to the reaction of positive ions in SUW with ions and the decrease of slag hydration rate, leading to a lower strength of CFTB. The positive effects were observed at the later ages (7–28 days). The higher later-age strength of SUW-mixed CFTB is attributed to two factors: (1) a smaller amount of ettringite (AFt) was generated at the very early ages, which reduced the encapsulation-hindering effect on the slag decomposition; and (2) SUW increased the slag hydration rate, promoting the condensation of calcium silicate hydrates, which results in increased formation of a calcium silicate aluminate hydrate [C-(A)-S-H] phase with rigid three-dimensional structure. These findings can provide important information for the use of SUW in CFTB in coastal and arid regions.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. U1906208, 51904055, and 51804063) and the Fundamental Research Funds for the Central Universities of China (Grant Nos. N2001010 and N2101043).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 10, 2022
Accepted: Jun 2, 2022
Published online: Dec 16, 2022
Published in print: Mar 1, 2023
Discussion open until: May 16, 2023
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Cited by
- Dong Wang, Baifu Luo, Qinqin Feng, Wei Zhang, Mohamed Elchalakani, Fu Xu, Development of Preplaced Alkali-Activated Coral Concrete for a Marine Environment, Journal of Materials in Civil Engineering, 10.1061/JMCEE7.MTENG-16226, 36, 1, (2024).