Effect of steel and synthetic fibers on shear strength of RC beams without shear stirrups

Sahoo, Dipti Ranjan; Maran, Kaushik; Kumar, Avdhesh

doi:10.1016/j.conbuildmat.2015.03.010

Cited by 55 publications

(22 citation statements)

References 26 publications

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“…Table lists the mechanical properties of various fibers used in structural applications. Steel fiber has a high pull‐out strength, resulting in concrete with a high tensile strength and toughness . Corrosion and reduced workability due to balling are the major challenges with steel FRC.…”

Section: Introductionmentioning

confidence: 99%

“…The chemically inert, high‐strength, and stiffer carbon fibers have the disadvantages of high cost and anisotropy. Synthetic fibers, mainly polypropylene, nylon, and so on, usually have a low elastic modulus, low melting point, and poor interfacial bonding with concrete …”

Section: Introductionmentioning

confidence: 99%

“…Steel fiber has a high pull-out strength, resulting in concrete with a high tensile strength and toughness. 7 Corrosion and reduced workability due to balling are the major challenges with steel FRC. Although the glass fibers improve the toughness of concrete, the long-term strength of concrete is reduced due to alkali attack (embrittlement).…”

Section: Introductionmentioning

confidence: 99%

“…Synthetic fibers, mainly polypropylene, nylon, and so on, usually have a low elastic modulus, low melting point, and poor interfacial bonding with concrete. [7][8][9] Recently, continuous basalt fibers originating from volcanic rocks have been used in concrete composites for the…”

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Experimental investigation of the mechanical properties of basalt fiber‐reinforced concrete

Jalasutram

Sahoo

Matsagar

2017

Structural Concrete

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This paper presents an experimental investigation of how varying the volume fraction of chopped basalt fibers affects the mechanical properties of fiber‐reinforced concrete (FRC). The fiber content is varied in the range of 0–2%. The main parameters investigated are workability, compressive strength, splitting tensile strength, flexural strength, and flexural toughness. Test results showed that the compression strength of concrete decreased marginally with the addition of basalt fibers in comparison with plain concrete. However, the mode of failure of FRC under compression is changed from the brittle to ductile. The splitting tensile strength of concrete is improved by 15% when basalt fibers with 2% volume fraction are added to the concrete mix. A significant increase of up to 75% is noticed in the flexural tensile strength of basalt FRC, with better post‐peak residual strength compared with the plain concrete. Furthermore, the flexural toughness of basalt FRC is increased by nearly three times that of the plain concrete based on the round panel tests.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the mechanical properties of basalt fiber‐reinforced concrete

Jalasutram

Sahoo

Matsagar

2017

Structural Concrete

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“…Among these is the Normal-weight Fiber Reinforced Concrete (NWFC), which is developed after addition of fibers of various shapes and material. Effectiveness of fibers in crack control and for improving mechanical properties like flexural performance, bond, toughness and as an alternate to minimum shear reinforcement for concrete in highly congested reinforcing areas is already well acknowledged and reported [1][2][3][4]. Also in recent years tests on using steel fiber reinforced concrete as strengthening material have shown promising results [5,6].…”

Section: Introductionmentioning

confidence: 95%

Bond of Reinforcement with Normal-weight Fiber Reinforced Concrete

Ali

Iqbal

Holschemacher

et al. 2016

Period. Polytech. Civil Eng.

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Shear behavior of high‐performance basalt fiber concrete—Part I: Laboratory shear tests on beams with macro fibers and bars

Mohaghegh

Silfwerbrand

Årskog

2018

Structural Concrete

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This paper presents findings from an experimental study on shear properties of high-performance concrete beams reinforced with basalt fiber reinforced polymer bars and macrobasalt fibers. The test specimens comprised seven beams for shear testing and five beams for measuring the residual tensile strength of fiber concrete. No stirrups were used in the test beams. As part of the experiments, the compressive strength and bulk electrical resistivity were measured. To assess the influence of fiber dosage on shear capacity of concrete beams, five-volume fractions of 43 mm macrobasalt fibers were investigated. The experimental results verified the hypothesis that shear capacity of concrete beams is associated with the fiber dosage. Furthermore, the results show a good correspondence with the predictions of Swedish standard (SS 812310:2014) and the fib Model Code 2010 predictions of shear strength of fiber reinforced concrete beams without shear stirrups. K E Y W O R D S basalt fiber reinforced polymer (BFRP) bars, fib model code (MC) 2010, highperformance concrete (HPC), macrobasalt fibers (MBF), shear behavior, Swedish standard (SS 812310:2014) 1 | INTRODUCTIONFiber concrete is an innovative material. The fact that the material can reduce labor costs and accelerate the building process makes it attractive to various construction companies. In addition to its economic advantages, the fibers can also improve the durability of concrete structures by reducing the crack width and thereby extend its service life. 1 During the last 40 years, the use of steel fibers as a shear reinforcement has been subject to various research projects. In this section, some relevant studies are cited.Narayan and Darwish 2 report from one of the first studies on the shear behavior of steel fiber concrete beams without stirrups. Their results show a noticeable improvement in the shear capacity of concrete beams due to the addition of steel fibers. They also found that increasing the shear capacity, as a result of improvement in dowel action and arching effect, is a function of fiber dosage, fiber aspect ratio and bonding strength. Furthermore, the shear span-to-effective depth ratio was also found to be influential on shear capacity of fiber concrete beams. 3 Other researchers have also observed the enhancement of shear capacity due to the addition of steel fibers. 4-6 Furthermore, a transition from brittle shear failure to a ductile flexural failure has been noticed by adding sufficient amount of steel fibers. 2,7,8 In high-performance concrete beams, besides the ductility improvement, adding steel fibers has shown to effectively delay the shear crack formation and limit the crack widths. 8 A study by Gustafsson and Noghabai 9 on highperformance fiber concrete beams showed that size effect has a significant impact on brittleness and consequently the enhancement of shear capacity. They also found that by increasing the specimen size, more fibers were needed.

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Effect of steel and synthetic fibers on shear strength of RC beams without shear stirrups

Cited by 55 publications

References 26 publications

Experimental investigation of the mechanical properties of basalt fiber‐reinforced concrete

Experimental investigation of the mechanical properties of basalt fiber‐reinforced concrete

Bond of Reinforcement with Normal-weight Fiber Reinforced Concrete

Shear behavior of high‐performance basalt fiber concrete—Part I: Laboratory shear tests on beams with macro fibers and bars

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