Study on mechanical properties of cemented backfill with different mineral admixtures

Qiu, Huafu; Liang, Chao; Tu, Bingbing; Zhang, Fu‐Shun; Lv, Wenyu

doi:10.1016/j.conbuildmat.2022.130251

Cited by 9 publications

(6 citation statements)

References 44 publications

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“…Figure 8 shows the strength test results of bentonite replacing gangue and tailing with different contents. It can be seen from Figure 8a,c that with the increase of curing age, the strength of gangue and tailing cemented backfill increases rapidly with the continuous hydration, and the research results are similar to the previous strength test results of backfill [24]. The development of the above strength with curing age is mainly due to the hydration reaction of cement and the pozzolanic reaction of fly ash.…”

Section: Mechanical Propertysupporting

confidence: 80%

“…Permeability reflects the transmission performance of backfill as a porous medium and refers to the difficulty of heavy metal ions in gas or liquid penetrating, diffusing, or migrating to groundwater near the backfill under the action of pressure concentration and other gradients [24]. The penetration performance of the pore structure is the most important index affecting the permeability.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [28] studied the permeability characteristics of backfill and designed and prepared highly durable underground backfill artificial pillars. Qiu et al [24,29] researched the influence of different waste rock and tailings contents on the strength and permeability of cemented backfill, which revealed that reducing the cement-sand ratio would also reduce its permeability, and found the change rule and characteristics of permeability after cement curing. He et al [30] investigated the flow properties, mechanical properties and permeability of polypropylene fiber on cemented backfill.…”

Section: Introductionmentioning

confidence: 99%

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A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Backfill mining has significant advantages in safe mining, solid waste utilization and ecological environmental protection, but solid waste materials (tailings, gangue and coal gasification slag, etc.), as derivative residues of the chemical and metallurgical industries, contain a large number of heavy metal elements, which is posing great challenges to the underground environment after backfill. In order to study the feasibility of bentonite for reducing the permeability of gangue/tailing sand cemented backfill body, relevant tests were carried out from the basic performance index, flow performance and mechanical properties of paste backfill materials. The test results show that bentonite has a significant effect on the water secretion rate of cemented fillers, and also promotes the improvement of slump and diffusion diameter of backfill slurry. The enhancement effect of mechanical properties in the early stage is not obvious, mainly concentrated in the middle and late stages of specimen curing. With the increase of bentonite content, the 28-day uniaxial compressive strength increased from 7.1 MPa and 7.9 MPa to 8.7 MPa and 9.0 MPa, respectively. Bentonite is filled between the pores of the cemented backfill with its fine particles and water swelling, which can reduce the porosity and permeability of the gangue and tailings cemented backfill. Therefore, on the premise of satisfying the flow and mechanical properties of paste backfill, bentonite can be used to improve the permeability of cemented backfill and reduce the leaching and migration of heavy metal ions.

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Section: Mechanical Propertysupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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“…The key to realizing large-scale underground backfilling of solid waste slurry is the fluidity and early strength of the backfill material. The fluidity affects the transportation and backfilling efficiency of the backfill slurry, while early strength affects the rock stratum control effect after backfilling [ [7] , [8] , [9] , [10] ]. Many scholars have done a lot of research work on the physical and mechanical properties of mine backfilling materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of multi-source solid waste on the performance of its backfill slurry

Zhao

Yang

Wei

et al. 2023

Heliyon

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“…The mechanical properties of backfill body, as a key structure for supporting surrounding rock, have always been the research focus of backfill mining technology. Numerous researchers have conducted comprehensive studies on various aspects of the mechanical properties of backfill bodies that incorporate solid wastes [2][3][4][5][6][7][8]. However, to realize the exploitation of geothermal energy while backfill mining, the study of the thermal properties of the backfill body is also an important aspect.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Zhang,

Han,

Liu

et al. 2023

Energies

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Based on phase-change heat storage backfill, paraffin microcapsules were selected as the phase change material and were directly mixed with backfill materials for preparing backfill specimens. The mechanical and thermal properties of specimens with different paraffin percentages and slurry concentrations were tested and analyzed. The results show that compressive strength gradually decreases with an increasing paraffin percentage while it significantly increases with increasing slurry concentration, thermal conductivity decreases with increasing paraffin percentage and specific heat capacity increases with an increasing paraffin percentage and slurry concentration. For a paraffin percentage from 0% to 10%, compressive strength decreases by an average of 22.5%, thermal conductivity decreases by an average of 43.8% and specific heat capacity increases by an average of 8.7% at a phase-change temperature of 30 °C. For a slurry concentration from 68% to 72%, compressive strength increases by an average of 4.12 times, and specific heat capacity increases by an average of 3.5% at a phase-change temperature of 30 °C. The weakening effect of phase-change materials on compressive strength can be effectively improved by the increase of slurry concentration, and the increases of paraffin percentage and slurry concentration can both improve the sensible heat storage capacity of backfill materials.

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Study on mechanical properties of cemented backfill with different mineral admixtures

Cited by 9 publications

References 44 publications

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Study on the effect of multi-source solid waste on the performance of its backfill slurry

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

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