Combined effects of steel fiber and strain rate on the biaxial compressive behavior of concrete

Bao, Jiuwen; Wang, Licheng; Zhang, Qiuyu; Liang, Yongqin; Pei-qing, Jiang; Song, Yuan-Hong

doi:10.1016/j.conbuildmat.2018.07.203

Cited by 21 publications

(6 citation statements)

References 42 publications

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“…With the increases in strain rate, the DIF of the SFRC exhibits a linear increasing trend, and the slope of the fitted line decreases with increasing confining pressure, as shown clearly in Figure 18. This finding is accordant with an earlier study [25], but differs slightly…”

Section: Difsupporting

confidence: 93%

“…SFRC often works under multi-axial stress under dynamic loads with different strain rates, and in actual engineering, the confining pressure of different parts has a significant impact on the failure mode of concrete [21][22][23][24][25]. To study the triaxial behavior of steel fiber reinforced cementitious mortar, Noori et al [23] performed a compressive experiment with various confining pressures (0-20 MPa).…”

Section: Introductionmentioning

confidence: 99%

“…However, Lu and Thoms [21] discovered that the nonlinear stress-strain relationship of high-strength concrete is barely impacted by steel fiber during triaxial compression, and high-strength concrete and steel fiber high-strength concrete are basically in the same ultimate strength envelope under Mohr Coulomb and Willam-Warnke failure criteria. The impacts of steel fiber and strain rate on the dynamic compressive behavior of SFRC as well as its dynamic compressive strength, dynamic influence factor, dynamic strength criterion and failure mode were examined by Bao et al [25]. In general, the failure mode is strongly associated with confining pressure, and the dynamic compressive strength of SFRC is favorably correlated with strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Dynamic Mechanical Properties and Microstructure Deterioration of Steel Fiber Reinforced Concrete Subjected to Freeze–Thaw Cycles

Wang

Xiong

et al. 2022

Buildings

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In this study, the dynamic mechanical properties of steel fiber reinforced concrete under the influence of freeze–thaw cycles were studied. The studied parameters include steel fiber content (0%, 1% and 2%), confining pressures (0, 5 and 10 MPa) and strain rates (10−5/s, 10−4/s, 10−3/s and 10−2/s). Performance was also evaluated, including triaxial compressive strength, peak strain, the relationship between stress and strain, failure mode and microstructure. The results show that with the increase in F–T cycles, the compressive strength and energy absorption capacity of concrete gradually decrease. The mechanical properties of concrete increased with the addition of steel fibers during F–T cycles, and the optimum amount of steel fiber to enhance resistance to F–T cycles is 1% within the evaluation range. In this study, the effects of strain rate and confining pressure on the strength and failure mode of concrete after fiber addition are studied. Both the dynamic increase factor and the concrete strength increase linearly with the increase of strain rate, the dynamic increase factor is characterized by an increase in intensity caused by strain rate. When there is no confining, the crack direction of the concrete specimen is parallel to the stress loading direction, and when there is confining, it is manifested as oblique shear failure. The results of scanning electron microscopy analysis of the microstructure demonstrate the performance results at the macroscopic level (compressive strength and peak strain).

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Section: Difsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Dynamic Mechanical Properties and Microstructure Deterioration of Steel Fiber Reinforced Concrete Subjected to Freeze–Thaw Cycles

Wang

Xiong

et al. 2022

Buildings

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“…It is concluded from the mechanical properties tests that under the same pouring quality, the addition of steel fiber can improve the compressive properties of concrete, but the improvement effect is not obvious, and the compressive strength is affected more by aggregate, pouring conditions and other factors. Moreover, when the content of steel fibers reaches a certain amount, excessive steel fibers tend to agglomerate in the concrete matrix, which is not conducive to the improvement of concrete compressive performance, and even reduces the strength of concrete [ 17 , 18 , 19 ]. The positive effect of steel fiber is mainly reflected in improving the tensile property, toughness and durability of concrete.…”

Section: Introductionmentioning

confidence: 99%

Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete

et al. 2023

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Notched beam specimens were loaded by the three-point bending test device, and the effects of different volume contents and combinations of steel fibers on the tensile properties of hybrid steel fiber–reinforced self-compacting concrete (HSFRSCC) were studied. The failure law and strain field distribution of the specimens were studied by digital image correlation (DIC) technology. Moreover, the curves between the load and crack mouth opening displacement (CMOD) of 18 groups of hybrid steel fiber–reinforced concrete specimens were obtained, and the stress‒strain curves of 18 groups of specimens were derived from the load–CMOD curves. The results show that both single and hybrid steel fibers can improve the crack deformation resistance and tensile properties of concrete, but hybrid steel fibers have a more significant improvement effect. Only when the content of steel fiber is more than 0.6% can it have a more obvious postpeak descending section, and hybrid steel fiber has higher postpeak deformation capacity and flexural toughness. The fundamental reason why concrete with hybrid steel fibers has better tensile properties is that micro and macro steel fibers cooperate with each other to resist cracks, improving the toughness of concrete after cracking. Finally, the mechanism of different size and volume content of steel fiber was analyzed from the micro level, which can be used as a reference for the engineering design of HSFRSCC in the future.

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“…Concrete is inevitably in a biaxial stress state in many engineering structures. It has been shown that the compressive strength is higher than that of uniaxially tested concrete in the compression-compression (C-C) stress state [6][7][8], which suggests that the structural design of concrete under C-C may be too conservative if the design parameters are determined from uniaxial tests. Meanwhile, reduced tensile resistance is usually measured in the biaxial compression-tension (C-T) stress state [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Reactive Powder Concrete Subjected to Biaxial Loading

Li²,

Jiang

et al. 2022

Advances in Civil Engineering

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To investigate the biaxial mechanical characteristics of reactive powder concrete (RPC), RPC plate specimens and bone-shaped specimens were tested under compression-compression and compression-tension loadings, respectively. The strengths and strains of the specimens were recorded, and the crack patterns and failure modes in various stress states were examined. Based on the test data, the characteristics of biaxial strength were analyzed, and a biaxial failure criterion was established. The characteristics of major stress-strain curves and failure modes in different biaxial stress states were determined. The results show that the ratio between the biaxial compression strength and the uniaxial compression strength was 1.44–1.58 for RPC. When the stress ratio under compression-tension was −0.05, the tensile strength decreased by 48%. Under compression-compression, the proportional limit of RPC was about 95%, and its peak strain was high. Under compression-tension, as the compressive stress increased, the elastic modulus decreased, and the peak strain in the tensile direction increased. When the RPC specimens were under compression-compression, the failure mode of RPC was splitting failure. Under compression-tension, the failure mode changed from single-crack tensile failure to multicrack compressive failure with increasing confining stress.

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Combined effects of steel fiber and strain rate on the biaxial compressive behavior of concrete

Cited by 21 publications

References 42 publications

Experimental Investigation on the Dynamic Mechanical Properties and Microstructure Deterioration of Steel Fiber Reinforced Concrete Subjected to Freeze–Thaw Cycles

Experimental Investigation on the Dynamic Mechanical Properties and Microstructure Deterioration of Steel Fiber Reinforced Concrete Subjected to Freeze–Thaw Cycles

Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete

Mechanical Behavior of Reactive Powder Concrete Subjected to Biaxial Loading

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