Bond-slip response of novel half-hooked steel fibers in ultra-high-performance concrete

Yoo, Doo-Yeol; Choi, Hong-Joon; Kim, Soonho

doi:10.1016/j.conbuildmat.2019.07.099

Cited by 33 publications

(3 citation statements)

References 27 publications

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“…Although a similar peeling off area of the mortar presented on specimens with steel fibers inclined at angle 45° and 60°, a larger peeling off depth happened on the specimens with steel fibers at greater inclination angle. This phenomenon is also reported in the reference [ 23 ]. With the increase in inclination angle of steel fiber, the peeling off force perpendicular to transversal section increased during the pull-out of steel fibers, which would be much more increased with the process of steel fibers straightened.…”

Section: Test Results and Analysessupporting

confidence: 87%

“…Normally, the inclination of steel fibers avoids the direct pullout of steel fibers from cementitious matrix. These benefits to the steel fibers worked together with the cementitious matrix [ 13 , 19 , 20 , 21 ]; however, it leads a potential rupture of fibers and matrix with higher tensile stresses [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. In this aspect, the influence of the inclination angle on the pullout behavior of steel fibers depends on the types, size and embedded length of steel fiber and the matrix strength [ 24 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Bond Behaviors of Steel Fiber in Mortar Affected by Inclination Angle and Fiber Spacing

Ding

Zhao

et al. 2022

Materials

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Considering the random orientation and distribution of steel fibers in concrete, the synergistic reinforcement of steel fibers on concrete is much complex than the bond of single fiber. It is meaningful to study the bond behavior of steel fiber during many actions. With the inclination angle of steel fiber to pullout direction and the fiber spacing as main factors, this paper carried out fifteen groups of pullout tests for hook-end steel fiber embedded in manufactured sand mortar. The inclination angle ranged from 0 to 60°, and the fiber spacing ranged from 3.5 mm to 21.2 mm. The characteristic pullout load-slip (PL-S) curve of steel fibers are given out after treating the original complete curves of each group test. The values of key points featured the debonding, peak and residual pullout loads and slips are determined from the characteristic PL-S curves. Based on a multi-index synthetical evaluation method, the nominal debonding strength, bond strength, residual bond strength and the debonding work, slipping work, and pullout work, as well as the debonding energy ratio, slipping energy ratio, and pullout energy ratio are analyzed. Results indicate that the bond performance represented by above indexes changes with the inclination angle and spacing of steel fibers. Except for the bond mechanism performing the same as aligned steel fibers by pullout test, the bond is dominated by the resistance of mortar to peeling off near pullout surface and scraping along pullout direction. When the inclination angle is over 15° or 30°, the bond performance is generally decreased, due to the peeling off of mortar on surface of transversal section with a certain depth. When the fiber spacing is over than 5 mm, the bond performance becomes worst due to the scraping out of mortar along with the slip of steel fibers.

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Section: Test Results and Analysessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Bond Behaviors of Steel Fiber in Mortar Affected by Inclination Angle and Fiber Spacing

Ding

Zhao

et al. 2022

Materials

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“…During the time of cement paste hydration, the binding quality is usually produced because of cement-water chemical reaction [23], which means a fullbond strength will be generated at the interface between the fiber and the concrete [24,25]. This interfacial full-bond strength should be sufficient with respect to the design requirements; otherwise, the composite will start in failure because of cracks development at the interfaces; these cracks can be considered as a warning for the service capacity, which means that the applied loads exceeded the design strength capacity [26,27].…”

Section: Introductionmentioning

confidence: 99%

Assessment of frictional-bond strength at the interface of single SSF in cementitious composite and prediction of accompanying pressure of surrounding matrix

Khabaz

2022

Composite Interfaces

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This paper deals with the study of bond in fiber-reinforced concrete composites and the effect of fiber/concrete interfacial friction on the fiber bond capacity. The paper presents the results of an experimental campaign including direct pull-out test of straight steel fiber-SSF embedded in concrete matrix, aimed at investigating the effect of some parameters, such as bonded length, yielding strength of steel fiber, fiber/concrete roughness, surrounding pressure of concrete matrix, and Poisson's ratio of concrete. Two analytical models based on the experimental results were proposed. Groups of single fiber embedded in concrete were prepared using different values of bonded length. The results showed that the frictional-bond strength, during fiber-slip stage, can be considered as constant despite changing the fiber embedment length. Furthermore, the SSF/concrete system can be considered as an elastic system, whereas the stressdisplacement relation is semilinear. Finally, the results showed good improvements in the efficiency of frictional-bond strength when using fresh concrete with higher self-compacting, greater roughness at the interface of SSF/hardened-concrete, and fiber with lower yield strength. While no significant effect of Poisson's ratio on the frictional-bond strength was noticed.

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Engineering Properties of Geopolymer Mortars Containing Industrial Steel Shavings

Gülmez

Koçkal

2023

Iran J Sci Technol Trans Civ Eng

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Bond-slip response of novel half-hooked steel fibers in ultra-high-performance concrete

Cited by 33 publications

References 27 publications

Bond Behaviors of Steel Fiber in Mortar Affected by Inclination Angle and Fiber Spacing

Bond Behaviors of Steel Fiber in Mortar Affected by Inclination Angle and Fiber Spacing

Assessment of frictional-bond strength at the interface of single SSF in cementitious composite and prediction of accompanying pressure of surrounding matrix

Engineering Properties of Geopolymer Mortars Containing Industrial Steel Shavings

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