Experimental and numerical investigations of heat transfer and phase change characteristics of cemented paste backfill with PCM

Wang, Mei; Liü, Lang; Zhang, Xiaoyan; Chen, Liu; Wang, Shiqi; Jia, Yuhang

doi:10.1016/j.applthermaleng.2018.12.103

Cited by 44 publications

(11 citation statements)

References 28 publications

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“…The cemented paste backfill (CPB) technology is a promising method for the safe disposal of mine tailings. Moreover, benefits like reclaiming water, stabilising the rock mass and thus increasing mining safety, and increasing ore recovery rate promote the broad application of CPB worldwide [2][3][4][5][6][7][8][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Understanding Cement Hydration of Cemented Paste Backfill: DFT Study of Water Adsorption on Tricalcium Silicate (111) Surface

Liü

et al. 2019

Minerals

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Understanding cement hydration is of crucial importance for the application of cementitious materials, including cemented paste backfill. In this work, the adsorption of a single water molecule on an M3-C 3 S (111) surface is investigated using density functional theory (DFT) calculations. The adsorption energies for 14 starting geometries are calculated and the electronic properties of the reaction are analysed. Two adsorption mechanisms, molecular adsorption and dissociative adsorption, are observed and six adsorption configurations are found. The results indicate that spontaneous dissociative adsorption is energetically favored over molecular adsorption. Electrons are transferred from the surface to the water molecule during adsorption. The density of states (DOS) reveals the bonding mechanisms between water and the surface. This study provides an insight into the adsorption mechanism at an atomic level, and can significantly promote the understanding of cement hydration within such systems.

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Section: Introductionmentioning

confidence: 99%

Understanding Cement Hydration of Cemented Paste Backfill: DFT Study of Water Adsorption on Tricalcium Silicate (111) Surface

Liü

et al. 2019

Minerals

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“…The characteristics of progressive failure were obvious with typical nonlinear deformation characteristics, especially the rock sample [23][24][25][26][27]. The basic mechanical parameters of all the samples are presented in Table 2.…”

Section: Coal Fracturing Mechanismmentioning

confidence: 99%

Correlational Analytical Characterization of Energy Dissipation-Liberation and Acoustic Emission during Coal and Rock Fracture Inducing by Underground Coal Excavation

2019

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This paper uses an acoustic emission (AE) test to examine the energy dissipation and liberation of coal and rock fracture due to underground coal excavation. Many dynamic failure events are frequently observed due to underground coal excavation. To establish the quantitative relationship between the dissipated energy and AE energy parameters, the coal and rock fracturing characteristics were clearly observed. A testing method to analyze the stage traits and energy release mechanism from damage to fracture of the unloading coal and rock under uniaxial compressive loading is presented. The research results showed that the relevant mechanical parameter discreteness was too large because the internal structures of the coal and rock were divided into multiple structural units (MSU) by a few main cracks. The AE test was categorized into four stages based on both the axial stress and AE event parameters: initial loading stage, elastic stage, micro-fracturing stage, and post-peak fracturing stage. The coal and rock samples exhibited minimum (maximum) U values of 60.44 J (106.41 J) and 321.19 J (820.87 J), respectively. A theoretical model of the dissipation energy during sample fracturing based on the AE event energy parameters was offered. The U decreased following an increase in ΣEAE-II/ΣEAE.

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“…CT scans of the mixture samples containing different waste rock proportions (Figure 1) show that the waste rock and tailing grains are randomly distributed in the samples, and the fill is a typical granular composite with a wide range of grain sizes. is condition suggests that the shear strength of the fill is determined by the friction strength between the grains in it [18,22,23].…”

Section: Introductionmentioning

confidence: 99%

A Shear Strength Model for a Subsidence Backfill Body Based on Adhesion Friction Theory

Liu

Zhang

Liu

et al. 2020

Advances in Civil Engineering

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Proper determination of the shear strength of the backfill body used to fill the subsidence is the basis for subsidence restoration and the stability analysis of materials. This study developed a shear strength calculation model for the backfill body by introducing adhesive friction theory into the shear strength analysis. A direct shear test was performed in the laboratory to verify the proposed method. Test results suggested that the shear strength calculation method based on adhesive friction theory can calculate the variation in the actual contact area between grains in the tested samples undergoing shearing and estimate the peak shear strength. The actual contact area was divided into two components, namely, adhesive contact area Arm and contact area reduction caused by shear displacement, which exhibited a maximum at Armax. The shear strength values calculated by this method were smaller than laboratory values, and their differences increased with the rock proportion in the backfill body. The differences between the theoretical and experimental values of shear strength increased with the rock grain size. The results of theoretical calculation, combined with the results of laboratory experiments, can provide support for the proper determination of shear strength of the backfill body.

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Experimental and numerical investigations of heat transfer and phase change characteristics of cemented paste backfill with PCM

Cited by 44 publications

References 28 publications

Understanding Cement Hydration of Cemented Paste Backfill: DFT Study of Water Adsorption on Tricalcium Silicate (111) Surface

Understanding Cement Hydration of Cemented Paste Backfill: DFT Study of Water Adsorption on Tricalcium Silicate (111) Surface

Correlational Analytical Characterization of Energy Dissipation-Liberation and Acoustic Emission during Coal and Rock Fracture Inducing by Underground Coal Excavation

A Shear Strength Model for a Subsidence Backfill Body Based on Adhesion Friction Theory

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