Effect of Steel Fiber and Different Environments on Flexural Behavior of Reinforced Concrete Beams

Bafghi, Mohammad Ali Barkhordari; Amini, Fereidoun; Nikoo, Hamed Safaye; Sarkardeh, Hamed

doi:10.3390/app7101011

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…For many years, researchers have been studying the effectiveness of steel fibers on the flexural behavior of RC structural members and it has long been acknowledged that they improved bending moment strength, ductility, failure toughness, and energy absorption capacity. Flexural cracking performance of SFRC beams with longitudinal steel reinforcing bars also appears to be enhanced with increased crack number, reduced crack width and height, restricted crack propagation, and delayed concrete spalling [68,69,70]. It has also been demonstrated that deformed or hook-ended steel fibers with higher aspect ratios can increase cracking resistance, energy dissipation, and ductility index most effectively [71,72].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

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Reinforced concrete (RC) beams under cyclic loading usually suffer from reduced aggregate interlock and eventually weakened concrete compression zone due to severe cracking and the brittle nature of compressive failure. On the other hand, the addition of steel fibers can reduce and delay cracking and increase the flexural/shear capacity and the ductility of RC beams. The influence of steel fibers on the response of RC beams with conventional steel reinforcements subjected to reversal loading by a four-point bending scheme was experimentally investigated. Three slender beams, each 2.5 m long with a rectangular cross-section, were constructed and tested for the purposes of this investigation; two beams using steel fibrous reinforced concrete and one with plain reinforced concrete as the reference specimen. Hook-ended steel fibers, each with a length-to-diameter ratio equal to 44 and two different volumetric proportions (1% and 3%), were added to the steel fiber reinforced concrete (SFRC) beams. Accompanying, compression, and splitting tests were also carried out to evaluate the compressive and tensile splitting strength of the used fibrous concrete mixtures. Test results concerning the hysteretic response based on the energy dissipation capabilities (also in terms of equivalent viscous damping), the damage indices, the cracking performance, and the failure of the examined beams were presented and discussed. Test results indicated that the SFRC beam demonstrated improved overall hysteretic response, increased absorbed energy capacities, enhanced cracking patterns, and altered failure character from concrete crushing to a ductile flexural one compared to the RC beam. The non-fibrous reference specimen demonstrated shear diagonal cracking failing in a brittle manner, whereas the SFRC beam with 1% steel fibers failed after concrete spalling with satisfactory ductility. The SFRC beam with 3% steel fibers exhibited an improved cyclic response, achieving a pronounced flexural behavior with significant ductility due to the ability of the fibers to transfer the developed tensile stresses across crack surfaces, preventing inclined shear cracks or concrete spalling. A report of an experimental database consisting of 39 beam specimens tested under cyclic loading was also presented in order to establish the effectiveness of steel fibers, examine the fiber content efficiency and clarify their role on the hysteretic response and the failure mode of RC structural members.

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Section: Introductionmentioning

confidence: 99%

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

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“…It is also noted that, the concrete mix MC have lower compressive strength than the RF0 mix, it is due to the presence of excessive water content due low water absorption of copper slag in the CF0 mix having 100% copper slag tends and Ettringite formation in the copper slag contained concrete. From Figure 7, the flexural strengths found to increase with increase in dosage of crimped steel fibre up to dosage of 1% for both 30 mm and 50 mm fibre due to bridging of fibre at crack and act as crack arrestors and increase in resistance to pulling resistance due to the presence of fibre [50]. Beyond 1% dosage of steel fibre, the Flexural strength tends to decreases due to the presence of extra fibres start to interfere with each other and within the concrete matrix.…”

Section: Compressive and Flexural Strengthmentioning

confidence: 99%

Static and cyclic behaviour of fibre-reinforced pavement concrete with copper slag as fine aggregate

Kamalasekar,

Murugasan,

Makendran

et al. 2024

Matéria (Rio J.)

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The objective of this research was to assess the performance of pavement-quality concrete having 100% copper slag as fine aggregate in the presence of steel fibre. In this research, the crimped steel fibre of two lengths (30 mm and 50 mm) and different dosages such as 0.5%, 1.0%, 1.5%, and 2.0% by weight of concrete are included in the concrete having 100% copper slag as fine aggregate and compared with the concrete having river sand and copper slag as fine aggregate without fibre. The mechanical characteristics that are being examined include fatigue performance, bond strength, impact strength, flexural strength, stress-strain behaviour, abrasion resistance, and slabs exposed to both static and cyclic loading. According to the experimental findings, pavement concrete that contains 100% copper slag as fine aggregate and 1% crimped steel fibre in both 30 and 50 mm diameters performs better and is more optimal. An inventive way to manage copper slag waste and create durable, stiff pavement construction is with copper slag in concrete road construction. Utilising copper slag in concrete road construction offers a novel approach to waste management and the creation of environmentally friendly concrete road construction.

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“…The results showed that the presence of these protective jackets that the effect had included effects and changes on the hoop confinement and the high resistance to R.P.C. Former researches such as Bafghi et al [45], Kotsovos et al [46], Soutsos et al [47], Barros and Figueiras [48], and Campione and Mangiavillano [49] had shown that the existence of steel fibers in concrete prevents or delays concrete cover spalling with an increase in the deformation capacity. The compressive, splitting, and flexural strengths rise while adding more amount of steel fibers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibrous Jacket on Behavior of RC Columns

Jassim

Chassib

2020

Civ Eng J

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This paper presented an extensive study about the strengthening of RC square short columns with high strength concrete jackets reinforced with steel fiber. The aim of this study is to investigate the effect of confinement by fibrous jacket on the behavior of RC column. A comparative study is performed on 23 square columns (six of them were unconfined columns where the remaining seventeen were confined columns) with varied parameters such as steel fibers ratio and type, jacket thickness, partial and full strengthening, type of confining jacket (hoop and composite), use of epoxy as bond material between the concrete column and strengthening jacket, and length parameter. The test results showed that the strengthened columns showed a significant improvement in the ultimate stress, load-carrying capacity, maximum strain, ductility, and energy absorption. Increase the steel fibers ratio (1, 1.5 and 2%) increased the ultimate stress by (22.5, 12.3 and 12.5%) respectively. The use of epoxy as bond material enhanced the ultimate stress by an average improvement by (55%). Composite case in the strengthening enhanced the load-carrying capacity larger than hoop case by (28.7 and 42%) for FRC jackets with hooked and straight fibers respectively but in case of stress capacity, hoop jacket carries stresses more than composite according to the stressed cross-sectional area. Increase jacket thickness (25 and 35 mm) enhanced the ultimate stress by (28.7 and 15.5%) respectively. Partial strengthening has a good enhancement in the ultimate load but was less than full strengthening. Increase the length by (25 cm) decreased the enhancement in load capacity of the column with hoop jacket by (45.3%). Concrete jackets enhanced Energy absorption and ductility which improved the deformation capacity. The compressive behavior of stub concrete columns was also modeled, simulated, and analyzed numerically by a 3D nonlinear finite element model. The verification process was performed against the reported data of the experimental test which proved the results of experimental results and showed a good agreement between experimental and numerical outcomes.

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Effect of Steel Fiber and Different Environments on Flexural Behavior of Reinforced Concrete Beams

Cited by 17 publications

References 24 publications

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Static and cyclic behaviour of fibre-reinforced pavement concrete with copper slag as fine aggregate

Effect of Fibrous Jacket on Behavior of RC Columns

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