Microstructure evolution and mechanical behavior of foamed cement-based tail backfills under varying fiber types and concentrations DOI Creative Commons
Tingting Jiang, Shuai Cao, Erol Yılmaz

и другие.

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Авг. 29, 2024

Abstract Industrial solid waste (mine tailings) management has emerged as the key universal ecological challenge a result of unceasing creation rising by-products. Employing tailings makes mine fill production economical and assists resolve disposal problems. Foamed cement-based backfill (FCTB) is consisting tailings, cement, water foaming agent. It provides certain advantages such lightweight, good fluidity, thermal insulation, yet relatively weak in strength. Additionally, FCTB’s strength properties can be intensely improved by adding fibers. A total 3 diverse fibers: polypropylene (PP), glass (G), basalt (B) well dodecyltrimethylammonium bromide (DTAB) agent were used to prepare fiber-reinforced foamed cementitious (FR-FCTB). The mechanical properties, energy evolution, ductility microstructure FR-FCTB elaborately investigated uniaxial compression tests (UCS) SEM. Laboratory findings demonstrates that reinforcing effect three fibers on FCTB specimens: > basalt. showed best features fiber content 0.3% was adopted FCTB. At this time, UCS performance reinforced FCTBs 0.85 MPa increased 18.1%. addition increase fill’s storage limit, slow down discharge elastic strain within backfill, enhance toughness. factor evaluates degree deterioration filling terms post-peak drop, with all values being greater than CTB. FR-FCTB’s chief hydration product C-S-H gel. Fiber’s bridging significantly rallies crack extension thus features. Lastly, study’s main results are instructive for industrial application metallic mines.

Язык: Английский

Slag-based stabilization/solidification of hazardous arsenic-bearing tailings as cemented paste backfill: Strength and arsenic immobilization assessment DOI Creative Commons
Haiqiang Jiang,

Jingru Zheng,

You Fu

и другие.

Case Studies in Construction Materials, Год журнала: 2024, Номер 20, С. e03002 - e03002

Опубликована: Фев. 21, 2024

The widespread occurrence of toxic arsenic in sulfidic and non-ferrous waste tailings hinders its disposal as cement paste backfill (CPB). Alkali activated slag (AAS) has recently begun to be practiced an alternative normal Portland (OPC). Nevertheless, technical information on immobilization mechanical characteristics arsenic-rich AAS-CPB is rather few. impacts activator nature, cure temperature content strength explored. Despite having greater strength, OPC-CPB consistently a stronger (1.7–21.1% higher) ability immobilize arsenic. optimum silica modulus for maximal capability depends curing time. Strength at3 days enhanced by higher doses, whereas at later ages (≥ 28 days) decreased. At all ages, the lowest capacity produced medium concentration (0.35). Irrespective type, increases rose, however OPC-CPB's more responsive changes than AAS-CPB's. room (20°C), (6.0–21.1% greater) efficiency (AIE) AAS-CPB, but opposite true lower (5°C) (35°C) temperatures (i.e., 5.4–12.0% 4.4–12.0% 5 35°C respectively). Early on, influence not immediately apparent, it tends become obvious with longer times. As role type elapsed time, high contents cause rise or decrease AIE. Notably, there no apparent connection between UCS Electrical conductivity moisture can steadily employed portray hydration progression both arsenic-free arsenic-containing CPB.

Язык: Английский

Процитировано

24
Polypropylene Fiber’s Effect on the Features of Combined Cement-Based Tailing Backfill: Micro- and Macroscopic Aspects DOI Open Access
Xihao Li, Shuai Cao, Erol Yilmaz

и другие.

Minerals, Год журнала: 2024, Номер 14(3), С. 212 - 212

Опубликована: Фев. 20, 2024

In undercut-and-fill mining, backfills show weak tensile strength and poor ductility properties since they act as artificial pillars to support stope roofs. Hence, the enhancement of stability mining structures is a crucial requisite for underground backfill operations. This study addresses reinforcing effect polypropylene (PP) on features combined cement-based tailing (CCTB) with varied cement/tail ratios (c/t: 1:8 1:4) at both macroscopic microscopic levels. Fill specimens containing fixed solid content 70 wt% were reinforced fiber (0.6 wt%) no (classified reference sample). They then cast in mold sizes 160 × 40 mm3, cured 7 days. Following curing, some experiments covering three-point bending assisted by DIC SEM performed inspect microstructure CCTB. The results illustrate that flexural fiber-oriented CCTB increases along c/t fraction, but it not greater than high fraction without fiber. Adding PP fiber, peak deflection was improved, increment increased linearly rising enhancing CCTB’s characteristics. damage starts from bottom middle, main cause stress distribution lowest section. addition CCTBs ability dissipate energy, which helps hinder crack extension prevent brittle occurring. shows AFt CSH key hydrate materials As result, this develops security determine its design safe production inputs sustainable filling

Язык: Английский

Процитировано

11
Microstructure evolution and mechanical behavior of foamed cement-based tail backfills under varying fiber types and concentrations DOI
Tingting Jiang, Shuai Cao, Erol Yılmaz

и другие.

Environmental Science and Pollution Research, Год журнала: 2024, Номер 31(39), С. 52181 - 52197

Опубликована: Авг. 14, 2024

Язык: Английский

Процитировано

11
Reinforcing effects of polypropylene on energy absorption and fracturing of cement-based tailings backfill under impact loading DOI
Jiajian Li, Shuai Cao, Erol Yilmaz

и другие.

International Journal of Minerals Metallurgy and Materials, Год журнала: 2024, Номер 31(4), С. 650 - 664

Опубликована: Апрель 1, 2024

Язык: Английский

Процитировано

10
Exploring microstructure and mechanical features of coupled cementitious tail-sand concrete by partial replacement of tungsten tailings DOI
Meilin Jiang, Shuai Cao, Erol Yilmaz

и другие.

Process Safety and Environmental Protection, Год журнала: 2024, Номер 190, С. 863 - 875

Опубликована: Авг. 26, 2024

Язык: Английский

Процитировано

10
Multi-algorithm based Gaussian mixture model applied to crack classification of cemented tailings backfill containing initial defects DOI

Juncheng Zhong,

Kang Zhao, Yun Zhou

и другие.

Powder Technology, Год журнала: 2024, Номер 436, С. 119479 - 119479

Опубликована: Фев. 1, 2024

Язык: Английский

Процитировано

7
Characteristics of overburden migration under continuous extraction and continuous backfill mining method with CO2 mineralized filling materials DOI Creative Commons
Yujun Xu, Liqiang Ma

Journal of Cleaner Production, Год журнала: 2024, Номер 440, С. 140920 - 140920

Опубликована: Янв. 25, 2024

CO2 mineral carbonation is a promising strategy to sequestrate CO2. Whereas, its industrial applications were still limited owing high temperature and pressure. A Trinity green mining (TGM) concept proposed for sequestration, solid waste treatment, overburden movement mitigation. The samples of mineralized filling materials (CMFM) developed at ambient pressure feasibility field application was verified. results show that: (1) As the fly ash (FA) proportion increases from 55 % 85 %, UCS ascends first then decreases, reaching peak 75 since dosage FA exceeds cementation ability gel. gel can be characterized as C–S(A)-H silicon-based (2) maximum yield stress 88 MPa mini-slump 109 mm. CMFM has good transportability while unsuitable due shorter initial setting time. mineralization rate decreases 1.34 1.13 mg CO2/g-CMFM with rising content. parameters fresh slurry transportation pipeline also determined. velocity injection 1.5 m/s. capacity diameter 192 m/h 213 mm, respectively. working pressures pump are 10.02, 8.81, 4.11, 3.91 thicknesses 8.4, 7.7, 5.2, 5.1 mm corresponding four different ratios CMFM. Additionally, rises processing grows 54 E3 t 80 t. In contrast, storage drops 188 152 Moreover, surface deformation under TGM illustrated using analogue simulation mechanical modeling. subsidence latter 23 which 15 greater than that former. tilt 0.15 mm/m 0.13 mm/m, curvature 0.375 E-2 0.152 E−2 mm/m2, two approaches meet grade Ⅰ damage standard buildings released by state, indicating ameliorate strata migration thus protect effectively.

Язык: Английский

Процитировано

6
Effects of creep deformation on the spatial evolution of pore and fracture structures in coal under unloading confining pressure DOI
Senlin Xie, Hongwei Zhou, Wenhao Jia

и другие.

International Journal of Rock Mechanics and Mining Sciences, Год журнала: 2024, Номер 174, С. 105658 - 105658

Опубликована: Янв. 31, 2024

Язык: Английский

Процитировано

6
Synthesis of cemented paste backfill by reutilizing multiple industrial waste residues and ultrafine tailings: Strength, microstructure, and GA-GPR prediction modeling DOI
Qianlong Li,

Bingwen Wang,

Lei Yang

и другие.

Powder Technology, Год журнала: 2023, Номер 434, С. 119337 - 119337

Опубликована: Дек. 27, 2023

Язык: Английский

Процитировано

12
Influence of elasticity of high-concentration paste on unsteady flow in pipeline transportation DOI Open Access
Weixiong Zheng,

Dongjie Wang,

Fuyan Lyu

и другие.

Physics of Fluids, Год журнала: 2024, Номер 36(1)

Опубликована: Янв. 1, 2024

In high-pressure pulsatile pipeline transport of high-concentration viscous paste, severe backflow is generated when there are sudden pressure drops due to the paste's elastic recovery, resulting in strong impact and damage system. The paste demonstrates high viscosity, yield stress, compressibility, shear elasticity. Nevertheless, effect elastoviscoplasticity properties on unsteady flow during remains uncertain. Consequently, we derived control equations that accounts for behavior linear compressibility. We conducted experimental research by building a circulating transportation system performed numerical analysis using finite-volume method (modified RheoFoam solver). results demonstrate substantial increase fluctuations within rapid elasticity paste. When accounting elasticity, maximum velocity increases 32.4% compared cases where not considered. piston pump reversal influenced level rate drop. Pressure more likely propagate along than low-pressure periods. These findings offer guidance analyzing characteristics designing systems.

Язык: Английский

Процитировано

4