Experimental study on dynamic compressive properties of fiber-reinforced reactive powder concrete at high strain rates

Hou, Xuyan; Cao, Shaojun; Zheng, Wenzhong; Rong, Qin; Li, Gang

doi:10.1016/j.engstruct.2018.05.036

Cited by 82 publications

(17 citation statements)

References 38 publications

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“…The typical strain rate time history curve of the concrete specimen under dynamic compression is shown in Figure 5, where Point A refers to the inflection point of the rising section of the curve, and Point B represents the inflection point of the corresponding falling section. The average strain rate of the middle platform section is selected as the representative value of the strain rate of the specimen under the current impact velocity of bullet [27,28]. A total of five strain rate levels are set for the test, and the corresponding input pressures are 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa and 0.5 MPa, respectively.…”

Section: Test Equipment and Methodsmentioning

confidence: 99%

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Research on the Mechanical Performance of Carbon Nanofiber Reinforced Concrete under Impact Load Based on Fractal Theory

Wei

Nie

2021

Crystals

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The research is focused on the dynamic compressive strength, impact toughness and the distribution law of fragmentation size for the plain concrete and the carbon nanofiber reinforced concrete with four fiber volume contents (0.1%, 0.2%, 0.3% and 0.5%) under impact load by using the Φ100 mm split-Hopkinson pressure bar. Based on the fractal theory and considering the micropore structure characteristics of the specimen, the impact of the strain rate and the dosage of carbon nanofibers on the dynamic mechanical performance of concrete is analyzed. According to the results, both the dynamic compressive strength and the impact toughness increase continuously with the improvement of the strain rate level at the same dosage of fiber, showing strong strain rate strengthening effect; at the same strain rate level, the impact toughness increases gradually with the increase in the fiber dosage, while the dynamic compressive strength tends to increase at first and then decrease; the distribution of the fragmentation size of concrete is a fractal in statistical sense, in general, the higher the strain rate level, the higher the number of fragments, the lower the size, and the larger the fractal dimension; the optimal dosage of carbon nanofibers to improve the dynamic compressive strength of concrete is 0.3%, and the pore structure characteristics of carbon nanofiber reinforced concrete exhibit obvious fractal features.

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Section: Test Equipment and Methodsmentioning

confidence: 99%

“…The impact toughness (IT) can be used to characterize the entire stress-strain development process of the specimen under impact load until the energy for the failure of the specimen is absorbed. The physical meaning of impact toughness refers to the area surrounded by stress-strain curve and transverse axis [28], expressed as follows:…”

Section: Impact Toughnessmentioning

confidence: 99%

Research on the Mechanical Performance of Carbon Nanofiber Reinforced Concrete under Impact Load Based on Fractal Theory

Wei

Nie

2021

Crystals

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“…On the other hand, the DIF of concrete material tends to decrease as its compressive strength increases, i.e. DIF of UHPFRC should be smaller than that of NC [45][46][47]. Nevertheless, since current DIF formulae for UHPFRC are mainly established with small amounts of data, most studies still utilize the CEB-FIB Model Code to predict the DIFs of UHPFRC [48].…”

Section: Rate Dependency Incorporationmentioning

confidence: 99%

A nonlinear rate-dependent model for predicting the depth of penetration in ultra-high performance fiber reinforced concrete (UHPFRC)

Cao

Tan

Zao

et al. 2020

Cement and Concrete Composites

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“…ey concluded that dynamic compressive strength, critical strain, and energy absorption increased as strain rate and steel fibre content increased. Furthermore, the growth of strength and strain is less significant than that of energy absorption because increases in strength and strain are ultimately reflected in increases in energy absorption [21][22][23][24]. Chen et al [25] tested the dynamic performance of ceramsite concrete with different numbers of F-T cycles and ceramsite volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

Wang

et al. 2019

Advances in Materials Science and Engineering

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This study aims at determining the effect of water pressure on the mechanical properties of concrete subjected to freeze-thaw (F-T) attack under the dynamic triaxial compression state. Two specimens were used: (1) a 100 mm × 100 mm × 400 mm prism for testing the loss of mass and relative dynamic modulus of elasticity (RDME) after F-T cycles and (2) cylinders with a diameter of 100 mm and a height of 200 mm for testing the dynamic mechanical properties of concrete. Strain rates ranged from 10−5·s−1 to 10−3·s−1, and F-T cycles ranged from 0 to 100. Three levels of water pressure (0, 5, and 10 MPa) were applied to concrete. Results showed that as the number of F-T cycles increased, the mass loss rate of the concrete specimen initially decreased and then increased, but the RDME decreased. Under 5 MPa of water pressure and at the same strain rate, the ultimate compressive strength decreased, whereas the peak strain increased with the increase in the number of F-T cycles. This result is contrary to the variation law of ultimate compressive strength and peak strain with the increase in strain rate under the same number of F-T times. With the increase in F-T cycles or water pressure, the strain sensitivity of the dynamic increase factor of ultimate compressive strength and peak strain decreased, respectively. After 100 F-T cycles, the dynamic compressive strength under all water pressure levels tended to increase as the strain rate increased, whereas the peak strain decreased gradually.

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Experimental study on dynamic compressive properties of fiber-reinforced reactive powder concrete at high strain rates

Cited by 82 publications

References 38 publications

Research on the Mechanical Performance of Carbon Nanofiber Reinforced Concrete under Impact Load Based on Fractal Theory

Research on the Mechanical Performance of Carbon Nanofiber Reinforced Concrete under Impact Load Based on Fractal Theory

A nonlinear rate-dependent model for predicting the depth of penetration in ultra-high performance fiber reinforced concrete (UHPFRC)

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

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