Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature

Xiu, Zhanguo; Wang, Shuhong; Ji, Yingchun; Wang, Feili; Ren, Fengyu

doi:10.1016/j.jenvman.2021.113828

Cited by 29 publications

(6 citation statements)

References 56 publications

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“…In recent years, ultrasonic treatment has been used in mineral processing, sludge filtration, and the chemical industry [ 15 , 16 , 17 ]. The literate indicates that the dispersion of reagents in the suspension is enhanced using ultrasonic treatment, reduces the electrostatic repulsion between particles, and promotes the increase of floc size [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Yang

Liao

et al. 2022

Molecules

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The efficient filtration of low-rank coal (LRC) slurry was significantly beneficial to the production process of wet coal beneficiation. However, relatively few studies have been reported on novel pretreatment methods for the efficient filtration of LRC slurry. In this paper, the mechanism of ultrasonic pretreatment to promote flocculation and filtration of slurry was studied. The hydrophobic variation of the slurry surface was measured by contact angle and XPS. The flocculation properties of slurry were characterized using zeta potential and FBRM. The effects of filter cake porosity and ultrasonic pretreatment on slurry filtration resistance were calculated by L-F NMR and Darcy’s theory. The results showed that the ultrasonic pretreatment promoted the flocculation and filtration performance of LRC slurry, increased the filtration rate, and decreased the cake moisture content. Meanwhile, the contact angle of LRC increased significantly from 50.1° to 67.8° after ultrasonic pretreatment, and the surface tension of the filtrate decreased from 69.5 to 53.31 mN/m. Ultrasonic pretreatment reduced the absolute value of the zeta potential of coal slurry from 24.8 to 21.0 mV, and the average chord length of flocs increased from 5–10 μm to 25–30 μm, thus weakening the electrostatic repulsion between coals to promote floc formation. In addition, the pore tests and filtration theory calculations showed that the ultrasonic pretreatment significantly improved the permeability of the filter cake to water and reduced the resistance to slurry during filtration. In particular, the mesopore porosity increased by 9.18%, and the permeability increased by 2.937 × 108 m2. Therefore, this contributed to the reduction of slurry filtration resistance. This research provides an efficient method for promoting the efficient filtration of slurry.

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Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Yang

Liao

et al. 2022

Molecules

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“…Shearing under partially drained conditions yielded a total friction angle of the mixtures that was always lower than the effective friction angle and varied between 15.1 °and 23.3 °. Since a clear understanding on the triaxial mechanical properties of cemented pasted backfill (CPB) is important to the CPB design and the stability analysis of the backfilled CPB structure, (Xiu et al, 2021;Xiu et al, 2022). carried out triaxial compression tests of the CPB samples using the geotechnical consulting and testing system (GCTS) with different curing times, drainage conditions, and curing temperatures.…”

Section: Figurementioning

confidence: 99%

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

et al. 2023

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The strength evolution law of concentrated full tailings is closely related to the storage construction method, especially the growth law of shear strength with curing age. This study aims to investigate the influence of curing materials on the shear strength of full tailings and reveal the change law of the shear strength of concentrated full tailings with the curing age. Therefore, we carried out a comparative triaxial shear test between pure full tailings and concentrated full tailings with different curing ages. The test results show that concentrated full tailings had a 70.7% higher cohesion and a 10% larger internal friction angle (IFA) than that of pure full tailings at the age of 0 days. Moreover, the concentrated full tailings cured for 3 days had a 170.2% higher cohesion and a 12.1% larger IFA than that cured for 0 days. In addition, the concentrated full tailings cured for 7 days had a 149.4% higher cohesion and a 12.1% larger IFA than that cured for 0 days. The stress-strain curve exhibits that the shear strength of full tailings is significantly influenced by the curing material and curing age. The stress-strain curve gradually moved from strain hardening to strain softening as the curing age increased, and the failure curve had two steps. This indicates that the specimen still has a certain shear capacity despite having a shear zone. The entire specimen instantly fails when the strain exceeds that capacity. The results of this study can be used as scientific bases for the design and construction of the surface storage structures of concentrated full tailings.

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“…The sound velocity slowly increases and the curing temperature has a linear relationship with the sound velocity with the increase in curing temperature. The curing temperature is different, the degree of cement hydration reaction is different, 4,7 and the size and distribution of defect micro-cracks in the sample are different (Figure 11); thus, the sound velocity is different. The uniaxial compressive strength is greater when the speed of sound is greater, which indicates that the HDC sample is denser.…”

Section: Ultrasonic Wavementioning

confidence: 99%

“…Pichler et al 6 studied the uniaxial compressive strength and hydration degree of concrete samples at different curing temperatures (15-70 C) and used a power law function to characterize the relationship between hydration degree and strength. Xiu et al 7 studied the effects of different curing temperatures (20,35, and 45 C) on the triaxial mechanical properties of cement-based tailing backfilling. The peak deviator stress and cohesion increase as the curing temperature rises, whereas the internal friction angle decreases.…”

Section: Introductionmentioning

confidence: 99%

Triaxial tests on high ductile concrete under different environmental conditions

Shi

Yan

Kou

2022

Structural Concrete

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Triaxial compression tests were conducted on high ductile concrete (HDC) under three curing conditions to study its triaxial mechanical properties under different curing environments. The three different curing conditions are as follows: standard curing (temperature 20 ± 2°C, humidity ≥95%), water curing (temperature 15 ± 2°C, humidity ≥95%), and −20°C (−20 ± 2°C, humidity ≥85%). The variation laws of stress–strain response, peak stress, peak strain, and volume strain were analyzed for HDC under different environmental conditions. The mechanism of the effect of HDC mesostructure on strength under different curing conditions was revealed using ultrasonic and nuclear magnetic resonance detection technology. The relationship between HDC uniaxial compressive strength and ultrasonic speed was obtained by fitting the test data, and the relationship between the shear strength and temperature was provided. Results show that the peak stress of HDC under the same confining pressure increases with the rise in the curing temperature. The peak strain also decreases, and the HDC exhibits better ductility under −20°C curing. The peak stress and peak strain of HDC under the same curing conditions increase with the rise in confining pressure. HDC specimen fracture is in the composite failure mode of shear and splitting, and it cracks but does not disintegrate. The pore size is larger and the strength is lower when the pores are more harmful.

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Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature

Cited by 29 publications

References 56 publications

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Experimental study of triaxial shear features of concentrated full tailings considering the effect of curing age

Triaxial tests on high ductile concrete under different environmental conditions

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