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Effect of Incorporating Waste Limestone Powder into Solid Waste Cemented Paste Backfill Material

1
School of resources and safety engineering, Central South University, Changsha 410083, China
2
Hunan Key Laboratory of Mineral Resources Exploitation and Hazard Control for Deep Metal Mines, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(10), 2076; https://doi.org/10.3390/app9102076
Received: 19 April 2019 / Revised: 8 May 2019 / Accepted: 17 May 2019 / Published: 20 May 2019
(This article belongs to the Special Issue Low Binder Concrete and Mortars)
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Abstract

To effectively reuse waste limestone powder, which is a major solid waste around mines, we replaced limestone powder back into a part of cement in solid waste cemented paste backfill (SWCPB) and studied the parameters of pore structures. To optimize the pore microstructure characteristics of SWCPB in mines, two different components and grade tailings were selected. The samples were characterized by scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) to examine the pore properties and microstructure of SWCPB. The results showed that (1) at the later curing stage, with the optimization of pore characteristics and microstructure through the limestone powder admixture, the strength of SWCFB was guaranteed at a 20% replacement degree of cement. (2) Porosity, macropore proportion, and the average pore radius all negatively correlated with limestone powder content, which were reduced by 7.15%, 46.35%, and 16.37%, respectively. (3) Limestone powder as a crystal nucleus participated in the hydration reaction and was embedded into the product to enhance the strength. View Full-Text
Keywords: limestone powder; cemented paste backfill; image analysis; pore characteristics limestone powder; cemented paste backfill; image analysis; pore characteristics
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Hu, J.; Ding, X.; Ren, Q.; Luo, Z.; Jiang, Q. Effect of Incorporating Waste Limestone Powder into Solid Waste Cemented Paste Backfill Material. Appl. Sci. 2019, 9, 2076.

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