Properties and application of thixotropic cement paste backfill with molybdenum tailings

Gao, Shan; Li, Wei; Yuan, Kekuo; Rong, Chuanxin

doi:10.1016/j.jclepro.2023.136169

Cited by 43 publications

(5 citation statements)

References 32 publications

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“…They were heated to temperatures of 100°C, 200°C, 300°C, 400°C, 500°C and 600°C at a rate of 6°C/min after completely cooled. Each temperature was maintained for 120 min to ensure uniform temperature distribution within the specimens then cooled in the furnace before further testing (Gao et al, 2023). A group of nine specimens were used at each temperature.…”

Section: Thermal Treatmentsmentioning

confidence: 99%

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

Ying,

Chen,

Chen

et al. 2024

Front. Mater.

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In buildings that experience fires, cement mortar is subjected to high-temperature environments and not only the weight of the structure above but also blast loads, leading to structural damage and loss of load-bearing capacity. To investigate the static and dynamic mechanical properties of thermally damaged mortar, a series of tests utilizing modified split Hopkinson pressure bar were conducted. These tests included quasi-static, conventional dynamic and coupled static-dynamic loading tests on mortar specimens that were subjected to seven temperature levels: 20°C, 100°C, 200°C, 300°C, 400°C, 500°C, and 600°C. The test results revealed that both the thermal damage and loading method had an impact on the mechanical properties and damage characteristics of the mortar specimens. The compressive strength, elastic modulus and absorbed energy ratio of mortar decreased as temperature increased. Notably, the quasi-static strength loss rate was 60% when the temperature reached 600°C. Under coupled static-dynamic loading, the specimens exhibited higher strength, elastic modulus, reflected energy ratio, and transmitted energy ratio. Conversely, they had lower average strain rates and absorbed energy ratios. Intriguingly, the dynamic growth factor had a relative increase of 0.7–2.0 compared with other loading methods. Furthermore, the higher temperature, the higher fragmentation of the specimens in the fragmentation pattern. Conventional dynamic loading resulted in the greatest degree of fragmentation. The findings provide a scientific basis for the design and evaluation of concrete shockproof and explosion-resistant structures.

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Section: Thermal Treatmentsmentioning

confidence: 99%

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

Ying,

Chen,

Chen

et al. 2024

Front. Mater.

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“…Yu Xiang et al [ 45 , 46 ] established a three-dimensional finite element fine model of the dam, studied the stress and strain conditions and deformation characteristics of the concrete cutoff wall during the dam filling and storage stage, and evaluated the distribution and evolution of the tensile stress in the cutoff wall. Wei Zhu [ 47 ] used a variety of clay and sandy soil combined with CaCl 2 solution to carry out the indoor improvement test of clay-based cutoff wall [ 48 ], tested the influence of CaCl 2 solution on the permeability coefficient, porosity and combined water content of mixed soil cutoff wall [ 49 ], and obtained the mechanism of its action.…”

Section: Introductionmentioning

confidence: 99%

Study on the deformation law of the construction of the cutoff wall of the reservoir

Sun,

Lei,

Yang

et al. 2024

Heliyon

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“…Stepping into an eco-friendly society, there is an increasing demand for material and energy saving, such as recycled aggregate and mineral tailings, which show great potential in mortar and concrete production [1][2][3]. Construction material, prestressed concrete (PC) with such virtue, has had an expanded usage market in recent years, including in public buildings, industrial and civil buildings [4][5][6] and railway bridges.…”

Section: Introductionmentioning

confidence: 99%

Effects of Prestressing Magnitude and Position on Seismic Performance of Unbonded Prestressed Concrete Beams

Chen,

Zeng,

et al. 2024

Buildings

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To study the effects of the jacking stress level, height and strength ratio of the prestress tendons (λ) on the seismic performance of unbonded prestressed concrete (UPC) beams, six UPC beams and one reinforced concrete (RC) beam were tested under cyclic loads. The hysteretic characteristics, skeleton curves, ductility properties, energy dissipation capacity, strain distribution of reinforcement and self-centering capability of the specimens were studied and discussed. Numerical parameter analysis was also carried out by using OpenSees. The results indicate that three failure modes of UPC beams under cyclic loading were observed, namely the tension-failure mode involving a broken rebar, the compression-failure mode involving concrete crushing and the balanced failure. By considering the influence of the prestress position and magnitude, the modified reinforcing index ω was proposed to determine the failure mode. The ω is suggested to be less than 0.3 to ensure sufficient ductility. The effective stress level is linearly and positively related to the stiffness from cracking to yield Kcr and the ultimate bearing capacity of the UPC beam under cyclic loading. The stiffness of the UPC beam is slightly larger than that of the RC beam before yielding, and significantly greater than that of the RC beam after yielding. Due to the large strength reserve after yielding, the integrated seismic performance of the UPC beam is similar to that of the RC beam. When the λ was unchanged, the increase in the relative height of the prestressed tendons αh is beneficial for the overall performance factor F, ductility and crack control. The stiffness degradation performance depends on the λ but is independent of the αh. The total energy dissipation of the non-tensioned UPC specimen was 59% higher than that of the RC beam. The cumulative total energy dissipation of the tensioned UPC specimen was only 13% lower than that of the RC beam with the same number of cycles, indicating that the UPC specimen had a considerable energy dissipation capacity.

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Properties and application of thixotropic cement paste backfill with molybdenum tailings

Cited by 43 publications

References 32 publications

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

Study on the deformation law of the construction of the cutoff wall of the reservoir

Effects of Prestressing Magnitude and Position on Seismic Performance of Unbonded Prestressed Concrete Beams

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