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Open AccessArticle

Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

1
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Backfill Engineering Laboratory, Shandong Gold Mining Technology Co., Ltd., Laizhou 261441, China
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Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China
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Department of Civil Engineering, Geotechnical Division, Recep Tayyip Erdogan University, Fener, Rize TR53100, Turkey
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(3), 288; https://doi.org/10.3390/min10030288
Received: 4 February 2020 / Revised: 19 March 2020 / Accepted: 20 March 2020 / Published: 22 March 2020
(This article belongs to the Special Issue Alkali Activated Materials: Advances, Innovations, Future Trends)
This study investigates the time-dependent rheological behavior of cemented paste backfill (CPB) that contains alkali-activated slag (AAS) as a binder. Rheological measurements with the controlled shear strain method have been conducted on various AAS-CPB samples with different binder contents, silicate modulus (Ms: SiO2/Na2O molar ratio), fineness of slag and curing temperatures. The Bingham model afforded a good fit to all of the CPB mixtures. The results show that AAS-CPB samples with high binder content demonstrate a more rapid rate of gain in yield stress and plastic viscosity. AAS-CPB also shows better rheological behavior than CPB samples made up of ordinary Portland cement (OPC) at identical binder contents. It is found that increasing Ms yields lower yield stress and plastic viscosity and the rate of gain in these parameters. Increases in the fineness of slag has an adverse effect on rheological behavior of AAS-CPB. The rheological behavior of both OPC- and AAS-CPB samples is also strongly enhanced at higher temperatures. AAS-CPB samples are found to be more sensitive to the variation in curing temperatures than OPC-CPB samples with respect to the rate of gain in yield stress and plastic viscosity. As a result, the findings of this study will contribute to well understand the flow and transport features of fresh CPB mixtures under various conditions and their changes with time. View Full-Text
Keywords: mine tailings; cemented paste backfill; alkali-activated slag; rheological properties mine tailings; cemented paste backfill; alkali-activated slag; rheological properties
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MDPI and ACS Style

Kou, Y.; Jiang, H.; Ren, L.; Yilmaz, E.; Li, Y. Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag. Minerals 2020, 10, 288.

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