Strength development and microstructural investigation of lead-zinc mill tailings based paste backfill with fly ash as alternative binder

Behera, Santosh Kumar; Ghosh, C.N.; Mishra, Devi Prasad; Singh, Prashant; Mishra, Krushna Gopal; Buragohain, J.; Mandal, Prabhat Kumar

doi:10.1016/j.cemconcomp.2020.103553

Cited by 112 publications

(22 citation statements)

References 56 publications

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“…After the fly ash content exceeded 70%, both the permeability and the above sensibility decreased. This trend in concert with findings of (Behera SK et al 2019), which reported that a water film was formed and adsorbed by the spherical surfaces when the fly ash came into contact with water. As the fly ash content increased, the amount of free water consumed by the formation of water film decreased dramatically.…”

Section: Influence Of MIX Ratio On Scb's Permeabilitysupporting

confidence: 89%

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Permeability Tests and Multi-Factor Analysis of Sand-Based Cemented Backfill Five-Component Samples With Different Mix Ratios

Zhou

Yao

Zhang

et al. 2021

Preprint

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Extensive coal mining involves the challenge of liberating coal resources under buildings, railways, and water bodies. Sand-based cemented backfill (SCB) mining is considered an effective method to solve this problem while utilizing solid wastes in large quantities. Since the groundwater seeping into SCB pores in a complex mining environment deteriorates the SCB strength and stability, the permeability optimization of SCB samples under multi-factor conditions by adjusting their mix ratios is very topical. Therefore, in this study, a large number of SCB samples were prepared using aeolian sand as aggregates, cement and fly ash as cementing materials, and quicklime and water reducing agent as additives. The mass of the aeolian sand was a fixed value, while other ingredients' content ratios were expressed as a percentage of aeolian sand mass. With all other factors being constant, the level of one factor was changed at a time for univariate analysis. Four levels were set up for each of the four factors, and 16 tests were performed for a total of 13 mix ratios with an axial pressure of 1 MPa and confining pressure of 3 MPa. The effects of mix ratios, pore size, porosity, and surface structure on SCB's permeability were analyzed in detail. Experimental results show variations of quicklime and fly ash contents significantly changed the SCB's permeability, and variations of cement and water reducing agent contents had a minor impact on SCB's permeability. SCB's permeability positively correlated with porosity, primary pore size, and compactness of surface structure. These findings are considered instrumental in improving the SCB waterproof performance.

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Section: Influence Of MIX Ratio On Scb's Permeabilitysupporting

confidence: 89%

“…As an environment-friendly coal mining method, sand-based cemented backfill (SCB) technology is widely used to control rock strata under buildings, railways, and water bodies (Behera SK et al 2019). However, in SCB mining below water bodies and above the confined water, the adjacent aquifers can be damaged.…”

Section: Introductionmentioning

confidence: 99%

Permeability Tests and Multi-Factor Analysis of Sand-Based Cemented Backfill Five-Component Samples With Different Mix Ratios

Zhou

Yao

Zhang

et al. 2021

Preprint

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“…Wang et al (2020a) reported that cyclic loading and unloading had perceptible effect on the mechanical properties of CTB, and the direct reason for the change of UCS is the change of deformation modulus caused by cyclic loading and unloading. In addition, to improve the mechanical properties of CTB, many scholars investigated the influence of alternative binders [fly ash (Behera et al, 2020), lime (Sharma and Kumar, 2021), limestone powder (Zheng et al, 2016), granulated blast furnace slag (Mashifana and Sithole, 2021), copper slag (Chen et al, 2021c), and lithium slag (He et al, 2019)], synthetic fibers [polypropylene fibers (Chakilam and Cui, 2020), polyacrylonitrile fibers (Cao et al, 2019b), and glass fibers (Zhou et al, 2021)], and plant fibers [rice straw (Wang et al, 2020b;Chen et al, 2020) and corn straw (Wang et al, 2021a)] on the mechanical properties of CTB. The above literatures obtained plentiful valuable results and enhanced the understanding of the mechanical properties of CTB.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

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Cemented tailing backfill (CTB) in underground mine inevitably experiences seepage field, which complicates its mechanical behavior. In this study, the mechanical properties and microstructure characteristics of CTB under different seepage water pressures (SWPs) were investigated. The results show that, with the increase in SWP, the mechanical properties of CTB decrease, but the decreasing trend reduces gradually. Higher SWP leads the microstructure of CTB looser and more porous, and the largest proportion of pores initiated and propagated by SWP is micropores, which means the damage in CTB under seepage is mostly caused by micropores. Besides, the mechanical properties of CTB under seepage decrease exponentially with the increase in porosity and present linearly inverse proportional relation to the pore area fractal dimension. Results above indicate that SWP has a significant deterioration effect on the mechanical properties and microstructure of CTB. The research could not only extend the knowledge of mechanical properties and microstructure characteristics of CTB under seepage but also provide a theoretical reference for mechanical index determination and stability analysis of CTB in water-rich underground mines.

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“…The generation of a large quantity of FA not only requires a large area of precious land for its disposal but also has become one of the sources of environmental pollution of both air and water. 3 The need for new and innovative methods is urged for reducing the impact on the environment due to the above issues of FA. The existing classical approach for the disposal of FA into the FA pond accomplishes the transportation of FA in the form of a slurry.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Transportation, Leaching, Stabilization, and Disposal of Fly Ash Using a Mixture of Natural Surfactant and Sodium Silicate

Behera

Das²,

Mishra

et al. 2021

ACS Omega

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The present study evaluates the transportation, leaching, and stabilization ability of novel saponin extracted from the fruits of Acacia auriculiformis. To enhance the dispersing behavior of the fly ash slurry (FAS) at a lower dosage of sodium silicate, A. auriculiformis was incorporated in FAS. In addition to the rheological study, an attempt has been made to remove heavy metals through leaching for the safe disposal of FAS. Critical factors such as the fly ash (FA) concentration, saponin dosage, surface tension, ζ potential, temperature, and combination of saponin and sodium silicate, affecting the rheology of FAS, were extensively studied. The addition of a nonionic natural surfactant saponin has been proved to enhance the wettability of FA particles by decreasing the surface tension of FAS. The obtained rheology results were compared with the stabilization yield of the previously reported commercial surfactant cetyltrimethylammonium bromide. The incorporation of sodium silicate in the FAS system was found to be phenomenal in the settling and stabilization of FAS, thereby developing reaction products like sodium aluminum silicate (N-A-S). This facilitates the sustainable disposal of FA preventing air pollution after dewatering. The formation of N-A-S was further supported by scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies.

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Strength development and microstructural investigation of lead-zinc mill tailings based paste backfill with fly ash as alternative binder

Cited by 112 publications

References 56 publications

Permeability Tests and Multi-Factor Analysis of Sand-Based Cemented Backfill Five-Component Samples With Different Mix Ratios

Permeability Tests and Multi-Factor Analysis of Sand-Based Cemented Backfill Five-Component Samples With Different Mix Ratios

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Sustainable Transportation, Leaching, Stabilization, and Disposal of Fly Ash Using a Mixture of Natural Surfactant and Sodium Silicate

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