Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests

Wang, Shi Ming; Dong, Longjun; Zhou, Jian

doi:10.1155/2018/8206287

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…As seen in Figure 9, the absorption energy per unit volume of sandstone increased with an increase in incident energy. e change in absorption energy of most rock-like materials also followed the above trend [31,32]. e magnitude increase would be reduced with an increase in con ning pressure in this study, regardless of whether the specimen was under radial uniform stress or under radial gradient stress.…”

Section: Deformationsupporting

confidence: 59%

Dynamic Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Wang

Liu

Zhou

et al. 2018

Advances in Civil Engineering

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Research on the dynamic compressive characteristics of sandstone under radial gradient stress and confining pressure is conducive to understanding the characteristics of the surrounding rock, especially in an excavation operation for an underground mine roadway and tunnel. The present work aimed at studying the effects of radial gradient stress and confining pressure on the impact of compression of sandstone using a large-diameter split Hopkinson pressure bar. The results showed that the dynamic strength of sandstone under radial gradient stress increased with strain rate following a power function, and the dynamic strength of the sandstone under radial gradient stress was lower and more sensitive to strain rate. The increase in strain at peak stress (peak strain) was linearly correlated with the strain rate under different confining pressures. The sensitivity of the peak strain to confining pressure was lower for the sandstone with a hole, while the values of the elastic modulus were decreased. However, further increasing the stain rate would lead to an increase in the elastic modulus. Also, the ductility of the sandstone with a hole tested in this study was found to improve more significantly. Finally, with an increase in the incident energy, the absorbed energy per unit volume would increase, but would not be affected obviously by the radial gradient stress.

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Section: Deformationsupporting

confidence: 59%

Dynamic Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Wang

Liu

Zhou

et al. 2018

Advances in Civil Engineering

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“…By adjusting the air pressure to control the impact velocity, three sets of impact tests (5,6, and 7 m/s) of concrete samples with different aggregate rates were carried out, and three parallel samples were prepared for each group test. According to the basic assumption of SHPB test technology, the dynamic mechanical parameters of the specimen, such as stress, strain, and strain rate, can be calculated through the data collected by the strain gauge on the compression bar, and the calculation formulas are as follows [27].…”

Section: Methodsmentioning

confidence: 99%

Analysis of Fractal and Energy Consumption Characteristics of Concrete under Impact Loading

Dang

Zhou

et al. 2021

Geofluids

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In order to study the compressive deformation and energy evolution characteristics of concrete under dynamic loading, impact compression tests with impact velocities of 5, 6, and 7 m/s were carried out on concrete samples with aggregate volume ratios of 0, 32%, 37%, and 42%, respectively, using a split Hopkinson pressure bar test apparatus. The broken concrete pieces after destruction were collected and arranged. The fractal characteristics of fragmentation distribution of concrete specimens with different aggregate rates under impact were discussed, and the roughness of the fragment surface was characterized by the fractal dimension of the broken fragment and the crack surface energy was calculated. In addition, the analytical equation of the fractal dimension of the broken fragment and the crack surface energy was established. The relationship between the specimen energy absorption and the crack surface energy was compared and analyzed. The results show that the concrete specimens are mainly tensile split failure modes under different impact speeds. The fractal dimension, absorption energy, and crack surface energy all increase with the increase in impact speed and decrease with the increase in the aggregate rate. When the aggregate rate is different, the effective utilization rate of the absorbed energy is the largest when the aggregate content is 37%. The surface energy of the crack can be used to estimate the concrete dynamic intensity.

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“…SHPB equipment has been successfully used to investigate the dynamic behaviors of materials, such as rock and concrete [25]. In this test, dynamic impact loading tests were conducted by the SHPB system with a diameter of 50 mm.…”

Section: Specimen Preparation and Experimental Setupmentioning

confidence: 99%

Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

Zhang

Yuan

2019

Advances in Civil Engineering

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Split-Hopkinson pressure bar (SHPB) tests were conducted for sandstone after recurrent heat-cool (H-C) cycles. Physical and mechanical properties, damage, and fracture characteristics of sandstone after the H-C cycle were explored. Additionally, the damage variable and release rate of damage strain were defined to describe the damage degree of the sandstone specimen after recurrent H-C cycles. Finally, the relationship between mass fractal dimension of fragmentation and cycling number was discussed. Results show that the P-wave velocity and density decrease with the increase of cycling number, while the porosity increases. It was found that the dynamic compressive strength and relative elastic modulus decrease with the increase of cycling number. 20 cycles is the critical point for the low temperature (L-T) group and moderate temperature (M-T) group, while it is 4 cycles for the high temperature (H-T) group. With the increase of cycling number, both the damage variable and release rate of damage strain of rock increase, while the destruction degree of sandstone becomes greater, and the corresponding fragments show more evenly.

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Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests

Cited by 4 publications

References 24 publications

Dynamic Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Dynamic Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Analysis of Fractal and Energy Consumption Characteristics of Concrete under Impact Loading

Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

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