Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Khabaz, Amjad

doi:10.1016/j.conbuildmat.2016.03.142

Cited by 25 publications

(11 citation statements)

References 15 publications

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“…f ftm /f tm of ST-F is the least, which is 1.84. is proved that steel fiber has excellent enhancement effect on flexural strength. Previous research suggested that the limited volume fraction of HE-F is 1.5% for the economical and efficient use of steel fiber on flexural performance [11]. However, test results of this paper indicated that flexural strength still increased with…”

Section: Flexural Strength Relationship Between Flexural Strength (Fcontrasting

confidence: 57%

“…Reinforced effect of steel fiber is mainly affected by fiber content, type, geometry, and strength of concrete matrix [9]. When the concrete matrix is fixed, the fiber content, type, and geometry are the main influence factors [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…According to manufacturing form, steel fiber is usually classified into three main shapes (straight form, hooked ends form, and corrugated form) [11,19]. Different steel fiber shapes have different effect on the mechanical performance of concrete due to the different bond property.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Zhang

Zhao

Fan

et al. 2020

Advances in Civil Engineering

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Steel fiber reinforced concrete (SFRC) has gained popularity in the last decades attributed to the improvement of brittleness and low tensile strength of concrete. This study investigates the effect of three shapes of steel fibers (straight, hooked end, and corrugated) with four contents (0.5%, 1%, 1.5%, and 2%) on the mechanical properties (compression, splitting tension, shear, and flexure) of concrete. Thirteen groups of concrete were prepared and investigated experimentally. Test results indicated that steel fiber had significant reinforcement on mechanical properties of concrete. When the steel fiber content increases from 0.5% to 2.0%, the compressive strengths increase about 4–24%, splitting tensile strengths increase about 33–122%, shear strengths increase about 31–79%, and flexural strengths increase about 25–111%. Corrugated steel fiber has the best reinforced effect on strength of SFRC, hooked end steel fiber takes the second place, and straight steel fiber is the least. Calculated formulas of compressive, splitting tensile, shear, and flexural strengths were established with consideration of the bonding properties between concrete and steel fiber. Influence factors of steel fiber αf and concrete matrix strength αc were put forward and determined by regression analysis of experimental data. Calculated results agree well with the experimental results.

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Section: Flexural Strength Relationship Between Flexural Strength (Fcontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Zhang

Zhao

Fan

et al. 2020

Advances in Civil Engineering

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“…The characterization of the tensile behaviour of SFRC has been largely investigated, particularly during the last few decades , where the interest of using SFRC in the structural applications became more evident [22][23][24][25]. However, the lack of comprehensive and detailed international standards on the fundamental properties of SFRC is the main reason behind the underutilisation in engineering practice so far.…”

Section: Introductionmentioning

confidence: 99%

Understanding the effects of hooked-end steel fibre geometry on the uniaxial tensile behaviour of self-compacting concrete

Abdallah

Rees

Ghaffar

et al. 2018

Construction and Building Materials

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A series of uniaxial tensile tests on cylinders made from steel fibre reinforced selfcompacting concrete (SFR-SCC) have been carried out to investigate the influence of fibre geometry and the combined effect of fibre content and distribution on the post-cracking behaviour. Three types of commercially available hooked end fibres (3D (single hooked), 4D double (double hooked) and 5D (triple hooked)) have been used in this study, which are added to the concrete mixture at two fibre dosages (0.5 and 1% by volume). The experiments show that the post-cracking strength increases significantly (P˂ 0.05) with the increase of fibre content for all mixtures. The combination of a unique shaped hook of high tensile strength demonstrates an optimum effect on the failure mode of concrete cylinders in which peak and post-peak strengths are raised. Notably, strain-hardening behaviour is observed only for cylinders reinforced with 5D hooked end fibres. A correlation between number of fibres exposed on fractured surfaces and post-cracking behaviour is established.

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“…Bonding forces between these two materials are generated due to friction forces at the interface, "as discussed by Khabaz [2]"; therefore, the final evaluation of the bonding forces is related with the real value of the friction forces, consequently the friction coefficient value between straight steel fiber and the concrete is important to evaluate and calculate the real value of the friction forces. Therefore, computer simulations might be created using same experimental data such as Elasticity Modulus and Poisson's Ratio, "as discussed by Koyanagi & Nakatani & Ogihara [13] and Bilisik [14]"; thus in the case of straight steel fiber we need to create 2 types of computer simulations, the first type represents the initial stage of perfect bond between the fiber and the concrete, and the second type is referred to frictional sliding of straight steel fiber during the extracting process from the concrete, "as discussed by Khabaz [19] and Beckert & Lauke [20]".…”

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confidence: 99%

2D Investigation of Bonding Forces of Straight Steel Fiber in Concrete

Khabaz

2015

OALib

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The joint behavior of steel fiber and concrete in Steel Fiber Reinforced Concrete (FRC) member is based on the fact that a bond is maintained between the two materials after the concrete hardens. If a straight steel fiber is embedded into concrete, a considerable force is required to pull the steel fiber out of the concrete. If the embedded length of the steel fiber is enough, the steel fiber may yield, leaving some length of the fiber in the concrete. The bonding force depends on the friction between the steel fiber and the concrete. It is influenced mainly by the shape of steel fiber and the concrete mix properties. The effect of parameters such as end condition of fiber (smooth or hooked-end), embedment length, (W/C) ratio, paste phase of FRC, steel-micro fiber, and curing conditions on fiber-matrix pull-out behavior must be determined. By considering the friction at the fiber-matrix interface during the fiber extraction process, analytical models which consider Poisson's effects on both fiber and matrix might be developed, and knowledge of the initial extraction stress of the fiber provides the residual normal stress at the fiber-matrix interface. The importance of this research lies in possibility to evaluate the bonding and friction forces of steel fiber in Steel Fiber Reinforced Concrete (SFRC) in the case of straight steel fiber. This evaluation will be done using 2D computer simulations including bonding and friction forces at the interfacial surface between the straight steel fiber and the concrete.

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Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Cited by 25 publications

References 15 publications

Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Understanding the effects of hooked-end steel fibre geometry on the uniaxial tensile behaviour of self-compacting concrete

2D Investigation of Bonding Forces of Straight Steel Fiber in Concrete

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