Toughness enhancement in steel fiber reinforced concrete through fiber hybridization

Banthia, Nemkumar; Sappakittipakorn, M.

doi:10.1016/j.cemconres.2007.05.005

Cited by 398 publications

(183 citation statements)

References 6 publications

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“…These significant increases in fracture energy can be attributed to the ability of the steel fibers to arrest cracks at both micro-and macro-levels. At micro-level fibers inhibit the initiation of cracks, while at macro-level fibers provide effective bridging and impart sources of toughness and ductility [33]. The increase in the value of the flexural fracture toughness can be attributed to the fiber pullout and fiber debonding in the fracture process.…”

Section: Load-deflection Relationshipmentioning

confidence: 99%

Effects of fiber strength on fracture characteristics of normal and high strength concrete

Aydın

2013

Per. Pol. Civil Eng.

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IntroductionPlain concrete is a brittle material with low tensile strength and strain capacity. This undesired behavior can be improved by inclusion of short discrete fibers into the matrix which prevent or control initiation, propagation, or coalescence of cracks [1]. Steel, glass, carbon, wood, synthetic and natural fibers are used for this purpose. The inclusion of fibers in concrete substantially improves many of its engineering properties such as tensile strength, flexural strength, fracture toughness, resistance to fatigue, impact, wear and thermal shock [2][3][4][5][6][7]. The most important effect of fiber inclusion is to prevent crack propagation in concrete. The extension and propagation of microcracks that occur due to the internal stresses in concrete are prevented by stress transfer capability of randomly distributed fibers [8][9][10].The performance of steel fiber reinforced concrete (SFRC) depends on the properties of concrete and the fibers. The aspect ratio (length/diameter), volume fraction and distribution of fibers influence the performance of SFRC [9,11]. Fiber efficiency is mainly controlled by the resistance of the fibers to pullout, which in turn depends on the bond strength at the fiber -matrix interface. The pull-out type of failure is gradual and ductile when compared with the more rapid and possibly catastrophic failure that may occur if the fibers break in tension [12]. Since the high strength concrete is more brittle than normal strength concrete [13,14] fiber performance in high strength matrix becomes more important parameter. Bayramov et al. [11] have examined the fracture surfaces of SFRC after splitting tensile test and reported that the fibers (tensile strength of 1050 MPa) with the aspect ratio of 65 (l/d = 65) were pulled out of the matrix while the fibers with the aspect ratio of 80 (l/d = 80) were broken in the concrete matrix strength of 60 MPa. Later,Şahin et al. [15] have investigated the effects of steel fiber strength (tensile strengths of 1100 and 2000 MPa) on mechanical and fracture properties of high strength concretes. They have reported the significant influence of fiber tensile strength on fracture energy and characteristic length of high strength concrete for the aspect ratios of 80 and 85. The effectiveness of tensile strength of steel fibers in crack bridging performance of high strength SFRCs has been shown in this study for these aspect ratios. Although

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Section: Load-deflection Relationshipmentioning

confidence: 99%

Effects of fiber strength on fracture characteristics of normal and high strength concrete

Aydın

2013

Per. Pol. Civil Eng.

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“…Hooked steel fibers generally contribute more to the toughness than straight fibers, because the anchorage with the surrounding matrix is improved by the hooked ends (Taerwe and Latin American Journal of Solids and Structures 13 (2016) 1695-1715 Vangysel, 1996;Banthia and Trottier, 1991). Longer fibers and higher aspect ratio also contribute to the higher toughness since the larger contact surface with the matrix results in stronger friction (Banthia and Sappakittipakorn, 2007). The monofilament crimped polypropylene fibers have good ductility, dispersion and help in condensing the microstructure of concrete (Sun and Xu, 2009).…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete

Ibrahim

Almusallam

Al-Salloum

et al. 2016

Lat. Am. j. solids struct.

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This paper investigates the stress-strain characteristics of Hybrid fiber reinforced concrete (HFRC) composites under dynamic compression using Split Hopkinson Pressure Bar (SHPB) for strain rates in the range of 25 to 125 s -1 . Three types of fibers -hooked ended steel fibers, monofilament crimped polypropylene fibers and staple Kevlar fibers were used in the production of HFRC composites. The influence of different fibers in HFRC composites on the failure mode, dynamic increase factor (DIF) of strength, toughness and strain are also studied. Degree of fragmentation of HFRC composite specimens increases with increase in the strain rate. Although the use of high percentage of steel fibers leads to the best performance but among the hybrid fiber combinations studied, HFRC composites with relatively higher percentage of steel fibers and smaller percentage of polypropylene and Kevlar fibers seem to reflect the equally good synergistic effects of fibers under dynamic compression. A rate dependent analytical model is proposed for predicting complete stress-strain curves of HFRC composites. The model is based on a comprehensive fiber reinforcing index and complements well with the experimental results.

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“…Further investigation using three different properties of carbon and polypropylene micro fibres added to steel fibres in a concrete mixture showed that macro fibres of steel with highly deformed geometry produced better hybrid than those with less deformed geometry [10]. Also, lower volume fraction of fibres had better performance for hybridization than those mixed with high volume fraction.…”

Section: Related Previous Studymentioning

confidence: 99%

Flexural behaviour of reinforced concrete beams with discrete steel – polypropylene fibres

2017

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Abstract. This paper discusses the experimental results on the flexural test of concrete containing different proportions of steel fibre (SF) and polypropylene fibre (PPF). The flexural test was carried out under 4-point bending load and followed the relevant standards to FRC. Hooked-end deformed SF fibre with 60 mm length and fibrillated virgin PPF fibre with 19 mm length were used in this study. Meanwhile, the concrete was designed for high strength concrete of C60. The mixture included both single SF and PPF, and also the combination of both fibres; Control beam (PC), beam with 75%SF, beam with 75%SF + 25%PPF and beam with 25%PPF. The total fibre volume fraction (Vf) was fixed at 1.5%. The experimental results show that the percentage proportion of combined SF-PPF at 75-25% had the best performance for its flexural capacity. Mixture with single PPF was also found not effective in delaying the onset of tension cracks and to increase the tensile strength of the concrete. Experimental result also shows beam with 75%SF +25%PPF had their structural stiffness improved the most as compared with the others. For the compressive strength, beam with 75%SF + 25%PPF also revealed comparable performance with the control for high strength composite concrete.

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Toughness enhancement in steel fiber reinforced concrete through fiber hybridization

Cited by 398 publications

References 6 publications

Effects of fiber strength on fracture characteristics of normal and high strength concrete

Effects of fiber strength on fracture characteristics of normal and high strength concrete

Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete

Flexural behaviour of reinforced concrete beams with discrete steel – polypropylene fibres

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