Fractal Characterization and NMR Analysis of Curing-Dependent Pore Structures in Cemented Tailings Waste RockBackfill DOI Creative Commons
Jianhui Qiu, Xin Xiong, Keping Zhou

и другие.

Fractal and Fractional, Год журнала: 2025, Номер 9(6), С. 367 - 367

Опубликована: Июнь 4, 2025

This study investigates the coupled effects of waste rock-to-tailings ratio (WTR) and curing temperature on pore structure mechanical performance cemented tailings rock backfill (CTRB). Four WTRs (6:4, 7:3, 8:2, 9:1) temperatures (20–50 °C) were tested. Low-field nuclear magnetic resonance (NMR) was used to characterize size distributions derive fractal dimensions (Da, Db, Dc) at micropore, mesopore, macropore scales. Uniaxial compressive strength (UCS) elastic modulus (E) also measured. The results reveal that (1) micropore complexity found be a key indicator structural refinement, while excessive led coarsening reduction. Da = 2.01 reaches its peak WTR 7:3 40 °C; (2) this condition, UCS E achieved 20.5 MPa 1260 MPa, increasing by 45% 38% over baseline (WTR 6:4, 20 °C); (3) when exceeded °C, dropped significantly (e.g., 1.51 50 °C for 7:3), indicating thermal over-curing coarsening; (4) correlation analysis showed strong negative relationships between total volume (R −0.87 δavs.UCS), positive 0.43). (5) multivariate regression models incorporating fractions, T2 relaxation times, predicted with R2 > 0.98; (6) hierarchical sensitivity follows order micro-, meso-, macropores. provides new insights into microstructure–mechanical relationship in CTRB offers theoretical practical basis design high-performance materials deep mining environments.

Язык: Английский

Experimental and DEM analyses of type I fracture characteristics of waste rock aggregate reinforced cemented tailing backfill DOI
Tianyu Zhu, Zhonghui Chen, Zhongyu Wang

и другие.

Theoretical and Applied Fracture Mechanics, Год журнала: 2024, Номер unknown, С. 104764 - 104764

Опубликована: Ноя. 1, 2024

Язык: Английский

Процитировано

3
A novel strategy for highly reinforcement on flexural properties of cement-based materials: new perspectives from magnetic-driven Field's metals DOI
Yuchao Gao, Linfeng Wu, Han Wang

и другие.

Journal of Building Engineering, Год журнала: 2025, Номер unknown, С. 111958 - 111958

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Utilization of waste rock from a low-carbon perspective: Mechanical performance analysis of waste rock-cemented tailings backfill DOI Creative Commons
Jia‐Qi Huang,

Cai Wu,

Nanhui Huang

и другие.

Journal of CO2 Utilization, Год журнала: 2025, Номер 94, С. 103058 - 103058

Опубликована: Март 5, 2025

Язык: Английский

Процитировано

0
Visualization and quantification of pore structure in cement tailings waste rock composites using X-ray computed tomography and deep learning DOI
Jiajian Li, Shuai Cao,

Weidong Song

и другие.

Construction and Building Materials, Год журнала: 2025, Номер 476, С. 141341 - 141341

Опубликована: Апрель 15, 2025

Язык: Английский

Процитировано

0
Numerical Study on Impact Damage and Damage Evolution of Cemented Backfill DOI Creative Commons
Qiang Li, Jinshan Sun,

Xianqi Xie

и другие.

Crystals, Год журнала: 2025, Номер 15(6), С. 514 - 514

Опубликована: Май 28, 2025

To quantitatively describe the damage degree and failure process of cemented backfill (CB) under dynamic loading, this paper performed numerical split Hopkinson pressure bar (SHPB) impact experiments on CB samples using ANSYS/LS-DYNA. The pattern with four mix ratios (cement-to-sand (c/s) 1:4, 1:6, 1:8, 1:10) at different velocities (v) (1.5, 1.7, 1.8, 2.0 m/s) were numerically investigated micro-crack density method to define variable (d). results revealed that use a waveform shaper in simulation yielded more ideal rectangular wave ensue uniform stress distribution across sample’s plane without concentration. Numerical simulations effectively depicted CB, overall trend exhibiting edge spalling followed by propagation interconnection internal cracks. When v increased from 1.7 m/s 1.8 m/s, d than 10%. As 1.5 for c/s 1:10 ranged 0.238 0.336, 0.274 0.413, 0.391 0.547, 0.473 0.617, respectively. A significant “leap” phenomenon was observed when ratio changed 1:6 1:8.

Язык: Английский

Процитировано

0
Fractal Characterization and NMR Analysis of Curing-Dependent Pore Structures in Cemented Tailings Waste RockBackfill DOI Creative Commons
Jianhui Qiu, Xin Xiong, Keping Zhou

и другие.

Fractal and Fractional, Год журнала: 2025, Номер 9(6), С. 367 - 367

Опубликована: Июнь 4, 2025

This study investigates the coupled effects of waste rock-to-tailings ratio (WTR) and curing temperature on pore structure mechanical performance cemented tailings rock backfill (CTRB). Four WTRs (6:4, 7:3, 8:2, 9:1) temperatures (20–50 °C) were tested. Low-field nuclear magnetic resonance (NMR) was used to characterize size distributions derive fractal dimensions (Da, Db, Dc) at micropore, mesopore, macropore scales. Uniaxial compressive strength (UCS) elastic modulus (E) also measured. The results reveal that (1) micropore complexity found be a key indicator structural refinement, while excessive led coarsening reduction. Da = 2.01 reaches its peak WTR 7:3 40 °C; (2) this condition, UCS E achieved 20.5 MPa 1260 MPa, increasing by 45% 38% over baseline (WTR 6:4, 20 °C); (3) when exceeded °C, dropped significantly (e.g., 1.51 50 °C for 7:3), indicating thermal over-curing coarsening; (4) correlation analysis showed strong negative relationships between total volume (R −0.87 δavs.UCS), positive 0.43). (5) multivariate regression models incorporating fractions, T2 relaxation times, predicted with R2 > 0.98; (6) hierarchical sensitivity follows order micro-, meso-, macropores. provides new insights into microstructure–mechanical relationship in CTRB offers theoretical practical basis design high-performance materials deep mining environments.

Язык: Английский

Процитировано

0