Behavior of steel fiber-reinforced high-strength concrete at medium strain rate

Jiao, Chujie; Sun, Wei; Huan, Shi; Jiang, Guoping

doi:10.1007/s11709-009-0027-0

Cited by 26 publications

(10 citation statements)

References 13 publications

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“…Both normal-strength concrete (Bischoff and Perry 1991;Ross et al 1995) and UHPC (Cavill et al 2006;Jiao et al 2009;Lai and Sun 2009;Zhang et al 2009;Ju et al 2010;Rong et al 2010) show strength increases at high strain rates. This strength increase is customarily quantified using the dynamic increase factor (DIF), the ratio of dynamic failure strength to quasi-static failure strength.…”

Section: Dynamic Compressive Behavior Of Uhpcmentioning

confidence: 99%

“…A central question is whether the strength increase in dynamic tests represents rate-sensitivity of the material or confinement effects due to the test method and specimen. Physical factors for the increase in strength at high strain rates include matrix viscoelasticity (Li and Meng 2003) and reduced time for microcrack propagation (Li and Meng 2003;Jiao et al 2009). The strength of concrete is also affected by the confining pressure, as shown by the Drucker-Prager model (Drucker and Prager 1952), for example.…”

Section: Dynamic Compressive Behavior Of Uhpcmentioning

confidence: 99%

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Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Groeneveld¹,

Ahlborn²,

Crane³

et al. 2017

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Casting structural elements with ultra-high performance concrete (UHPC) tends to create preferential fiber alignment, which affects the strength and must be accounted for in design. To date, most work on fiber-orientation effects has been in tension rather than compression. This work characterizes the fiber orientation occurring in a typical UHPC beam and how that orientation affects compressive behavior at high strain rates. Specimens (36 total) were cored from the beam, and their fiber orientations were non-destructively evaluated using x-ray computed tomography. Fibers showed flow-induced alignment along the length of the beam. The perpendicular orientation number was used to describe orientation, as fibers perpendicular to the load were most effective in crack bridging. Quasi-static compressive strength appeared to increase with perpendicular orientation number, but the correlation is uncertain due to data limitations. Dynamic tests at strain rates of 130 to 200 s-1 were performed with a split-Hopkinson pressure bar. Dynamic compressive strength was independent of orientation number in these tests, although results suggested that the distribution and orientation of fibers influenced crack formation. The strain at peak stress, a measure of ductility, increased up to 25 percent over the range of perpendicular orientation numbers tested. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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Section: Dynamic Compressive Behavior Of Uhpcmentioning

confidence: 99%

Section: Dynamic Compressive Behavior Of Uhpcmentioning

confidence: 99%

Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Groeneveld¹,

Ahlborn²,

Crane³

et al. 2017

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“…It shows that the impact strain of BSFRC is improved by strain rate. This is inconsistent with the strain-rate hardening effect [40], namely, the strain of strain-rate sensitive material will be restrained as the stress increases. This is because BSFRC is heterogeneous and the strain softening effect [41] appears due to the microcracks and pores inside BSFRC.…”

Section: Discussionmentioning

confidence: 97%

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

et al. 2019

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Concrete in practical applications has to inevitably suffer various impact loads. Recent research indicates that the hybrid fiber reinforced concrete (FRC) has better dynamic mechanical properties compared to the mono FRC under impact loading. Based on macro-experimentation and micro-observation, the impact behavior of the hybrid basalt-macro synthetic polypropylene FRC (BSFRC) was investigated by using ∅74 mm SHPB, SEM, and EDS. The effects of fiber hybridization, strain rate, and w/c ratio were analyzed simultaneously. The results show that the dynamic mechanical properties of BSFRC are strain-rate sensitive. Both basalt and macro synthetic polypropylene fibers (BF, SF) have a strengthening and toughening effect on concrete. Their hybridization has a similar enhancement effect but the impact toughness of concrete is further improved and the best hybrid ratio is 0.05%(BF)–0.25%(SF). BSFRC with higher w/c ratio has a higher strain rate effect while the fiber hybridization effect is weakened. Besides, the proposed constitutive model can well describe the impact behavior of BSFRC. The hydration of cement in the interface transition zones is lower with more Calcium Silicate Hydrate and less Ca ( OH ) 2 than that in the common mortar. However, the addition of BF and SF contributes to the hydration of cement and improves the performance of concrete eventually.

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“…The mechanical properties of both concrete and limestone have been reported to be loading rate sensitive, with compressive and tensile strengths showing improvements with increasing strain rate [1,2,[5][6][7][8][9][10][11][12][13][14][15]. In concrete specimens, the number of fragments resulting from specimen fracture increased and the corresponding average fragment size decreased with increasing strain rate [1,5,8].…”

Section: Introductionmentioning

confidence: 99%

In situ observation of fracture processes in high-strength concretes and limestone using high-speed X-ray phase-contrast imaging

Parab

Guo

Hudspeth

et al. 2017

Phil. Trans. R. Soc. A.

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The mechanical properties and fracture mechanisms of geomaterials and construction materials such as concrete are reported to be dependent on the loading rates. However, the in situ cracking inside such specimens cannot be visualized using traditional optical imaging methods since the materials are opaque. In this study, the in situ sub-surface failure/damage mechanisms in Cor-Tuf (a reactive powder concrete), a high-strength concrete (HSC) and Indiana limestone under dynamic loading were investigated using high-speed synchrotron X-ray phase-contrast imaging. Dynamic compressive loading was applied using a modified Kolsky bar and fracture images were recorded using a synchronized high-speed synchrotron X-ray imaging set-up. Three-dimensional synchrotron X-ray tomography was also performed to record the microstructure of the specimens before dynamic loading. In the Cor-Tuf and HSC specimens, two different modes of cracking were observed: straight cracking or angular cracking with respect to the direction of loading. In limestone, cracks followed the grain boundaries and voids, ultimately fracturing the specimen. Cracks in HSC were more tortuous than the cracks in Cor-Tuf specimens. The effects of the microstructure on the observed cracking behaviour are discussed.This article is part of the themed issue 'Experimental testing and modelling of brittle materials at high strain rates'.

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Behavior of steel fiber-reinforced high-strength concrete at medium strain rate

Cited by 26 publications

References 13 publications

Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Effect of fiber orientation on dynamic compressive properties of an ultra-high performance concrete

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

In situ observation of fracture processes in high-strength concretes and limestone using high-speed X-ray phase-contrast imaging

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