Influence of industrial graphene oxide on tensile behavior of cemented waste rock backfill

Gao, Yuan; Yu, Zixuan; Cheng, Zhangjianing; Chen, Weiqiang; Zhang, Tao; Wu, Jiangyu

doi:10.1016/j.conbuildmat.2023.130787

Cited by 17 publications

(1 citation statement)

References 67 publications

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“…Additionally, the CWRB also promotes waste source reduction and resource recycling [5], thereby solving land resource waste caused by waste rocks, additional economic burdens, and potential security threats [3]. The reinforcing effects of the CWRB on the rock movement mainly depend on the mechanical properties of the backfill [6]. 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].…”

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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