Effect of aggregate size distribution and confining pressure on mechanical property and microstructure of cemented gangue backfill materials

Wang, Yiming; Wu, Jiangyu; Ma, Dawei; Yang, Shuo; Yin, Qian; Feng, Yi‐Ying

doi:10.1016/j.apt.2022.103686

Cited by 17 publications

(2 citation statements)

References 45 publications

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“…It is generally believed that the key to influencing the mechanical properties of cemented backfill materials is the hydration products constituting its bearing structure [11].…”

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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“…It is generally believed that the key to influencing the mechanical properties of cemented backfill materials is the hydration products constituting its bearing structure [11].…”

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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“…Scholars have studied the compaction characteristics of collapsed rock masses in goaf areas, focusing on analyzing the relationship between tangent and secant moduli and stress during the compaction process of rock blocks [18,19]. Scholars have conducted a series of limestone particle compaction experiments, focusing on the impact characteristics of particle size distribution factors on compaction characteristics [20][21][22][23]. Some scholars have studied the long-term creep mechanical behavior of gangue lling materials on self-developed bidirectional compaction experimental equipment [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill

Sun¹,

Zhu

et al. 2023

Preprint

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Coal mine backfilling mining controls the movement of overlying rock and surface subsidence by backfilling the fractured rock mass into the goaf. The compaction mechanical performance of the fractured rock is the key to the effectiveness of overlying rock control. In order to optimize the control effect of crushed gangue overlying rock, this article focuses on the regulating effect of gangue particle size grading on mechanical properties. Through research on the physical properties of gangue and natural graded gangue compaction experiments, the porosity of gangue crushing and the process of gangue crushing are analyzed. It is shown that the gangue material has good load-bearing performance in terms of physical structure, and the elastic modulus has an absolute effect on the compression characteristics of gangue particles. Through storage analysis of the natural grading experiment phenomenon, it was found that the alarm height for gangue not to be blocked is 20m. Through laboratory experiments, the compression characteristics of group B samples were analyzed, and it was found that the particles showed a trend of first increasing and then decreasing under the coupling effect of particle size and particles of different sizes. Through the analysis of particle strain energy density and breakage energy, it is concluded that the strain energy density of the sample from high to low is B1, B2, B6, A5, B5, B4, and the breakage energy consumed to reach the sample broken state from low to high is A5, B6, B5, B4, B3, B2, B1, so the B6 group samples have the best economic benefits. Through analysis from the perspective of filling rate, it was found that the B6 group of samples has the best control effect on the overlying rock. Thus providing suggestions for optimizing the efficiency and effectiveness of backfill mining.

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Experimental study on influencing mechanism of the multiple effect of steel slag powder for coarse tailings cemented backfill

Zhao,

Hu,

Yang

2024

Environ Sci Pollut Res

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Effect of aggregate size distribution and confining pressure on mechanical property and microstructure of cemented gangue backfill materials

Cited by 17 publications

References 45 publications

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

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

Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill

Experimental study on influencing mechanism of the multiple effect of steel slag powder for coarse tailings cemented backfill

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