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Appl. Sci. 2018, 8(9), 1537; https://doi.org/10.3390/app8091537

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

1,2,* , 3,* , 1,2
and
1,2
1
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
3
First Quantum Minerals Ltd., Cayeli Bakir Isletmeleri A.S., PO Box 42, Madenli, Cayeli, Rize TR53200, Turkey
*
Authors to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 20 August 2018 / Accepted: 27 August 2018 / Published: 3 September 2018
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Abstract

With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder’s internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax3bx2 + cxd. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine’s UCS requirements with a relatively low cost (17.04–17.20 €/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders. View Full-Text
Keywords: cemented tailings backfill; desulfurized ash; alkali-activated slag; uniaxial compressive strength; curing time; neural network prediction cemented tailings backfill; desulfurized ash; alkali-activated slag; uniaxial compressive strength; curing time; neural network prediction
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Xue, G.; Yilmaz, E.; Song, W.; Cao, S. Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag. Appl. Sci. 2018, 8, 1537.

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