Effects of packing density and water film thickness on the fluidity behaviour of cemented paste backfill

Qiu, Jingping; Guo, Zhenbang; Yang, Lei; Jiang, Haiqiang; Zhao, Yingliang

doi:10.1016/j.powtec.2019.10.046

Cited by 107 publications

(35 citation statements)

References 51 publications

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“…Recently, this method has been increasingly adopted to measure the fluidity of fresh backfills. According to the literature [ 11 ], the spread diameter (SD) obtained from the slump test is determined by the yield shear stress, an important rheological parameter of fluids. Hence, in this study, a mini-cone (5 cm in top diameter, 10 cm in bottom diameter, and 15 cm in height) was selected to measure the diameter of the spread.…”

Section: Methodsmentioning

confidence: 99%

“…This technology correspondingly solves many issues (low ore recovery, surface subsidence, acid mine drainage, groundwater pollution, tailing dam failure, etc.) and brings economic and environmental benefits [ 6 , 7 , 8 , 9 , 10 , 11 ]. CPB is an engineered mixture composed of thickened and filtered tailings, water, and hydraulic binder, with a total solid concentration (tailings + binder) of 70–85% [ 7 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

Ding

Zhang

2020

Materials

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In order to reduce the CO2 emission and cost of binders used in cemented paste backfill (CPB) technology, new blended binders with a large amount of fly ash (FA) were fabricated. Different doses of quicklime and calcium sulfoaluminate cement (CṠA) were used as mineral accelerators to improve the early workability of CPB. The effects of CṠA and quicklime on flowability, compressive strength, pore structure, hydration heat, and hydration evolution were investigated experimentally. The results showed that the addition of quicklime and CṠA reduced the spread diameter of the fresh backfill and improved the mechanical performance of the hardened CPB. With increasing quicklime and CṠA, the cumulative hydration heat of the blended binder distinctly increased in the first 6 h. CṠA improved the initial hydration by increasing the reactivity, and quicklime increased the hydration rate by activating FA. The blended binder (15% quicklime + 10% CṠA) with the lowest CO2 emission and cost had potential application in filling technology.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

Ding

Zhang

2020

Materials

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“…Compared with other storage media, salt rock has the advantages of low permeability, stable mechanical properties, excellent creep characteristics, and strong damage selfhealing ability. Meanwhile, since salt rock is easy to dissolve in water, the cavity construction by the solution mining method not only can utilize the salt rock comprehensively but also can abase investment costs and reduce environmental pollution [5][6][7]. erefore, the salt rock stratum is internationally considered as an ideal medium for underground storage of energy resources and disposal of radioactive waste.…”

Section: Introductionmentioning

confidence: 99%

“…With the continuous development of science and technology, the observation methods of microstructure variation during rock creep process are also becoming increasingly abundant, and SEM and AE technologies are also used to explore the deformation mechanisms of salt rock during creep process. (6) In terms of the creep constitutive model, the empirical model can describe the creep behavior of salt rock better, but the model parameters are lack of physical meanings. e basic elements in the component combination model and fractional derivatives model are all linear, and whatever how to combine them, the models established still cannot reflect the nonlinear creep behavior of salt rock accurately.…”

mentioning

confidence: 99%

Creep Properties and Constitutive Model of Salt Rock

Zhang

Song

Wang

et al. 2021

Advances in Civil Engineering

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Due to the advantages of low porosity, low permeability, high ductility, and excellent capacities for creep and damage self-healing, salt rock is internationally considered as the ideal medium for underground storage of energy and disposal of radioactive waste. As one of the most important mechanical properties of salt rock, creep properties are closely related to the long-term operation stability and safety of salt rock underground storage cavern. A comprehensive review on the creep properties and constitutive model of salt rock is put forward in this paper. The opinions and suggestions on the research priority and direction of salt rock's mechanical properties in the future are put forward: (1) permeability variation of salt rock under the coupling effect of temperature and stress; (2) damage mechanism and evolution process under the effect of creep-fatigue interaction and low frequency cyclic loading; (3) microdeformation mechanisms of salt rock and the relationship between microstructure variations and macrocreep behavior during creep process; (4) the establishment of the creep damage constitutive model with simple form, less parameters, easy application, and considering the damage self-healing ability of salt rock simultaneously.

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“…The rheological properties of CPB mass is greatly affected by several parameters including particle size distribution, chemical composition, liquor and solids density, pH, temperature, admixture, mineralogy, mixing regime, and solids concentration [28][29][30]. There is an internal friction caused by the interaction of water and solids, which may affect the flow rate of CPB material.…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

et al. 2020

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This study investigates the time-dependent rheological behavior of cemented paste backfill (CPB) that contains alkali-activated slag (AAS) as a binder. Rheological measurements with the controlled shear strain method have been conducted on various AAS-CPB samples with different binder contents, silicate modulus (Ms: SiO2/Na2O molar ratio), fineness of slag and curing temperatures. The Bingham model afforded a good fit to all of the CPB mixtures. The results show that AAS-CPB samples with high binder content demonstrate a more rapid rate of gain in yield stress and plastic viscosity. AAS-CPB also shows better rheological behavior than CPB samples made up of ordinary Portland cement (OPC) at identical binder contents. It is found that increasing Ms yields lower yield stress and plastic viscosity and the rate of gain in these parameters. Increases in the fineness of slag has an adverse effect on rheological behavior of AAS-CPB. The rheological behavior of both OPC- and AAS-CPB samples is also strongly enhanced at higher temperatures. AAS-CPB samples are found to be more sensitive to the variation in curing temperatures than OPC-CPB samples with respect to the rate of gain in yield stress and plastic viscosity. As a result, the findings of this study will contribute to well understand the flow and transport features of fresh CPB mixtures under various conditions and their changes with time.

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Effects of packing density and water film thickness on the fluidity behaviour of cemented paste backfill

Cited by 107 publications

References 51 publications

Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

Creep Properties and Constitutive Model of Salt Rock

Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

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