Effect of CNT-FA hybrid on the mechanical, permeability and microstructure properties of gangue cemented rockfill

Yu, Zixuan; Jing, Hong Wen; Gao, Yuan; Xu, Xiaonan; Zhu, Gaofang; Sun, Shenghao; Wu, Jiangyu; Liu, Yanming

doi:10.1016/j.conbuildmat.2023.131978

Cited by 7 publications

(2 citation statements)

References 74 publications

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“…The problem of coal gangue disposal has gradually become a constraint on China's efficient development of mineral resources [9][10][11], and an ecological environmental protection strategy is one of the obstacles [12][13][14][15]. How to efficiently, greenly, scientifically, and safely dispose of solid wastes such as coal gangue will inevitably become the key to the realization of an ecological environment and the economic and social development of high quality in the field of coal [16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Wang,

Yu,

et al. 2024

Minerals

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Coal gangue, the primary solid waste generated during the coal mining process, is typically disposed of on the surface, where it gradually accumulates to form gangue piles that significantly contaminate the surrounding environment. Filling technology has been widely employed for the safe and efficient disposal of coal gangue due to its sustainability, safety, and efficiency. However, there is still a lack of theoretical research on the concentration of gangue slurry in long-distance filling pipeline transportation. Therefore, a calculation model of the ultra-long-distance transportable concentration of coal gangue slurry with different grades was constructed based on the static anti-segregation performance and Bingham model. In addition, the relevant parameters of the calculation model of the ultra-long-distance transportable concentration of coal gangue slurry in this mine were determined using the 8 km pipeline transport of coal gangue slurry in one mine as the technical background. It was subsequently demonstrated that the yield stress, plastic viscosity, and mass concentration of the various grades of gangue slurry in this mine exhibit an increasing exponential function, while the slurry density and mass concentration exhibit an increasing linear function, and the mass concentration and actual flow rate correspond to a quadratic polynomial increment. Finally, the minimum and maximum concentrations for different grades of gangue slurry that can be transported over long distances in this mine were determined. This work provides theoretical and practical guidance on how to select the concentration of gangue slurry for long-distance pipeline transport.

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Section: Introductionmentioning

confidence: 99%

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Wang,

Yu,

et al. 2024

Minerals

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“…If the mechanical parameters of the CWRB cannot meet the expected requirements of the projects, it will cause a series of issues influencing mining safety [7]. Therefore, in recent decades, many scholars devoted themselves to strengthening the mechanical behavior of the CWRB [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Graphene Oxide on the Pore-Throat Connection of Cement Waste Rock Backfill

Cheng

Wang

et al. 2023

Materials

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The pore-throat characteristics significantly affect the consolidated properties, such as the mechanical and permeability-related performance of the cementitious composites. By virtue of the nucleation and pore-infilling effects, graphene oxide (GO) has been proven as a great additive in reinforcing cement-based materials. However, the quantitative characterization reports of GO on the pore-throat connection are limited. This study applied advanced metal intrusion and backscattered electron (BSE) microscopy scanning technology to investigate the pore-throat connection characteristics of the cement waste rock backfill (CWRB) specimens before and after GO modification. The results show that the microscopic pore structure of CWRB is significantly improved by the GO nanosheets, manifested by a decrease in the total porosity up to 31.2%. With the assistance of the GO, the transfer among internal pores is from large equivalent pore size distribution to small equivalent pore size distribution. The fitting relationship between strength enhancement and pore reinforcement efficiency under different pore-throat characteristics reveals that the 1.70 μm pore-throat owns the highest correlation in the CWRB specimens, implying apply GO nanosheets to optimizing the pore-throat under this interval is most efficient. Overall, this research broadens our understanding of the pore-throat connection characteristics of CWRB and stimulates the potential application of GO in enhancing the mechanical properties and microstructure of CWRB.

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The influence of carbon imperfections on the physicochemical characteristics of coal gangue aggregates

Jiao,

Qiao,

Jia

et al. 2023

Construction and Building Materials

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Effect of CNT-FA hybrid on the mechanical, permeability and microstructure properties of gangue cemented rockfill

Cited by 7 publications

References 74 publications

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Influence of the Graphene Oxide on the Pore-Throat Connection of Cement Waste Rock Backfill

The influence of carbon imperfections on the physicochemical characteristics of coal gangue aggregates

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