Influence of Particle Size on the Basic and Time-Dependent Rheological Behaviors of Cemented Paste Backfill

Deng, Xuejie; Klein, Bern; Hallbom, Donald; Wit, B. de; Zhang, J. X.

doi:10.1007/s11665-018-3467-7

Cited by 45 publications

(25 citation statements)

References 51 publications

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“…A considerable amount of research has recently been conducted on filling materials (coal gangue, fly ash, and construction waste) and microstructural characteristics for coal mines [6][7][8]. Feng et al [9] studied the mechanical properties of cemented filling materials in which gangue was partially replaced by waste concrete.…”

Section: Introductionmentioning

confidence: 99%

Influential Factors in Transportation and Mechanical Properties of Aeolian Sand-Based Cemented Filling Material

Zhou

Ouyang

et al. 2019

Minerals

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Given that normal filling technology generally cannot be used for mining in the western part of China, as it has only a few sources for filling gangue, the feasibility of instead using cemented filling materials with aeolian sand as the aggregate is discussed in this study. We used laboratory tests to study how the fly ash (FA) content, cement content, lime–slag (LS) content, and concentration influence the transportation and mechanical properties of aeolian-sand-based cemented filling material. The internal microstructures and distributions of the elements in filled objects for curing times of 3 and 7 days are analyzed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The experimental results show that: (i) the bleeding rate and slump of the filling-material slurry decrease gradually as the fly ash content, cement content, lime–slag content, and concentration increase, (ii) while the mechanical properties of the filled object increase. The optimal proportions for the aeolian sand-based cemented filling material include a concentration of 76%, a fly ash content of 47.5%, a cement content of 12.5%, a lime–slag content of 5%, and an aeolian sand content of 35%. The SEM observations show that the needle/rod-like ettringite (AFt) and amorphous and flocculent tobermorite (C-S-H) gel are the main early hydration products of a filled object with the above specific proportions. After increasing the curing time from 3 to 7 days, the AFt content decreases gradually, while the C-S-H content and the compactness increase.

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Section: Introductionmentioning

confidence: 99%

Influential Factors in Transportation and Mechanical Properties of Aeolian Sand-Based Cemented Filling Material

Zhou

Ouyang

et al. 2019

Minerals

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“…For this method, wastes, such as gangue and fly ash are used as the main backfill materials: These are mixed in certain proportions with cementing agents and stirred to become high-concentration slurries with no need for dehydration. Under the self-weight of a backfill pump and backfill materials, the slurries are transported to goafs in the backfill mining panel through backfill pipes [57] (Figure 3).…”

Section: Backfilling Technique For Coal Mines In Chinamentioning

confidence: 99%

“…Relations between compressive strength and volumetric strain versus curing time of high-watercontent backfill materials are shown in Figure 8, and the values in legend represent different water content. By analysing the figure, induration of high-water-content backfill materials provides early strength, that, within the first 2 h and 8 h account for 21% to 90% of the final strength, thus improving the mining and backfilling efficiency of the panels [57,58]. Furthermore, by analysing the volume of induration of high-water-content backfill materials, the volumetric strain in high-water-content materials changes slightly with time, indicating that the material is incompressible and exerts adequate control over the capacity of overlying strata.…”

Section: High-water-content Backfill Materialsmentioning

confidence: 99%

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Properties and Application of Backfill Materials in Coal Mines in China

et al. 2019

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Coal is the basic resource underpinning energy generation in China, however, constant, large-scale mining of coal results in many problems such as ecological destruction of mining areas. As a result, backfilling of solid waste underground is proposed to control strata and surface subsidence and to protect the environment. At present, these materials, such as granular material, cemented material and high-water-content materials are mainly used for backfilling. This study summarised the types of backfill materials that are used in coal mines in China along with the backfilling process. Moreover, distribution and characteristics of mines backfilled with these backfill materials were obtained and analysed. Considering the socio-environmental aspects that affect backfilling, this research proposed a guideline for the selection of backfill materials and then analysed specific engineering cases of three backfill materials. In addition, the future development of backfill materials was discussed. With extensive extraction of shallow coal resources in China and, therefore, rapid depletion of coal resources in eastern regions of China, coal mining depth is increasing significantly. As a result, it is required to investigate new backfill materials suited for the deep high-stress environment.

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“…The viscosity and strength behavior of the prepared CTB slurry mixes are the two most important indicators. Deng et al [52] have shown experimentally that the rheological behavior of CTB samples is greatly affected by the tailings' particle size and transport properties. The CTB materials prepared with finer particle sizes show higher yield stress than those of coarser particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Viscosity, Strength and Microstructural Properties of Cemented Tailings Backfill

2018

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In this study, the particle size distribution and chemical composition of gold mine tailings were examined experimentally. A series of viscosity and uniaxial compressive strength (UCS) tests were used to study the relations between the viscosity of cemented tailings backfill (CTB) slurry, the solid content (SD), and the cement-to-tailings ratio (c/t). Relations between UCS performance of CTB and SD, c/t, and curing time (CT) were discussed while examining the microstructure of 28-day cured backfill with different solid contents. Results illustrate that a major increase in CTB viscosity by increasing the SD leads to the formation of tailings grains for a skeleton formation, which is formed due to consolidation and gravitational forces. The CTB’s strength increases with the increase of c/t, SD, and CT, due to a decrease in water-to-cement ratio and porosity, and an increase in hydration products over time. The SEM micrographs show how CTB’s microstructure is affected by the SD, generating ettringites and calcium silicate hydrates in the backfill matrix. The findings of this study will lead to an efficient CTB mix design for reaching the higher performance in underground mining structures, thereby reducing expenses related to the backfill.

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Influence of Particle Size on the Basic and Time-Dependent Rheological Behaviors of Cemented Paste Backfill

Cited by 45 publications

References 51 publications

Influential Factors in Transportation and Mechanical Properties of Aeolian Sand-Based Cemented Filling Material

Influential Factors in Transportation and Mechanical Properties of Aeolian Sand-Based Cemented Filling Material

Properties and Application of Backfill Materials in Coal Mines in China

Evaluation of Viscosity, Strength and Microstructural Properties of Cemented Tailings Backfill

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