Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Bicer, Kamil; Yalçıner, Hakan; Balkıs, Ayşe Pekrioğlu; Kumbasaroğlu, Atila

doi:10.1016/j.conbuildmat.2018.07.021

Cited by 57 publications

(12 citation statements)

References 30 publications

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“…That is, the compressive strength of PP0.4 was lower than that of the control concrete by 52.83% and 26.76%, respectively, at 7 days while for PP0.8, it was 56.33% and 31.63% at the age of 28 days. Some researchers [37,38] think that PP fiber plays an essential role in bridging cracks when distributed inside the concrete. Because the stress transferred between the crack tip and the concrete surface in the crack areas can be achieved by the great adhesion between the concrete and fiber.…”

Section: Effects Of Fiber Type and Shape On Compressive Strengthmentioning

confidence: 99%

Effect of Fiber Type, Shape and Volume Fraction on Mechanical and Flexural Properties of Concrete

Başsürücü

Fenerli

Kına

et al. 2022

Journal of Sustainable Construction Materials and Technologies

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An experimental study was herein presented focusing the effect of different type, shape and volume fraction of fibers on the hardened properties of concrete including compressive, splitting tensile and flexural strengths at 7 and 28 curing days. A control concrete mixture with no fiber was prepared and six fiber reinforced concrete mixtures were designed by using two different types of fibers which were steel fibers with different shapes (short straight and hooked end) and polypropylene fiber with the volume fraction of 0.4% and 0.8%. The load-deflection curves and toughness of the specimens were analyzed based on ASTM C1609. The results showed that the utilization of short straight steel fibers with 0.8% volume fraction was most efficient at improving the compressive strength while the use of 0.8% long hooked end steel fibers provided better splitting tensile and flexural strengths. Besides, the long hooked end steel fibers with the volume fraction of 0.8% contributed to an excellent deflection hardening behavior resulting in higher load deflection capacity and toughness at peak load, L/600 and L/150. On the other hand, with incorporation of polypropylene fiber, all strength values were decreased regardless of the volume fraction and curing days.

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Section: Effects Of Fiber Type and Shape On Compressive Strengthmentioning

confidence: 99%

Effect of Fiber Type, Shape and Volume Fraction on Mechanical and Flexural Properties of Concrete

Başsürücü

Fenerli

Kına

et al. 2022

Journal of Sustainable Construction Materials and Technologies

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show abstract

“…They used high‐strength mix designs and showed that the flexural capacity of specimens is extremely improved by increasing the volume fraction of fibers. Bicer et al 15 investigated the effect of corrosion on the flexural strength of reinforced concrete. Four corrosion levels and three different volume fractions of fibers were considered, and it was concluded that the ductility of the corroded beams can be preserved by increasing the amount of fibers.…”

Section: Introductionmentioning

confidence: 99%

Fiber bridging in polypropylene‐reinforced high‐strength concrete: An experimental and numerical survey

Khaloo

Daneshyar

Rezaei

et al. 2021

Structural Concrete

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Fracture process of fiber-reinforced concrete notched beams is investigated here. Polypropylene macrosynthetic fibers are utilized for reinforcing concrete specimens, and a high-strength mix design is used to produce strong bonds between the embossed polypropylene fibers and the cementitious matrix of beams. Considering different locations for the notch, this study focuses on bridging mechanism under different conditions using both experimental and numerical approaches. First mode of fracture occurs due to opening of crack faces. This mode of failure is simulated by imposing symmetric boundary conditions on middle-notched beams. Inducing the notch with an offset from the middle, mixed-mode condition is achieved, wherein a combination of opening and sliding of crack surfaces occurs. Plain and reinforced concretes are used to cast each setup of test in order to analyze the bridging effects in different cases.Nonlinear behavior of the cementitious matrix is reproduced numerically using a continuum damage model, and instead of the common phenomenological representation of fibers (e.g., via cohesive crack method), fibers are explicitly modeled in direct numerical simulations. Once the nonlinear response of fibers is obtained, the method can provide valid responses in general loading conditions. This feature distinguishes the proposed approach from the cohesive crack method, wherein the contribution of opening mode, shearing mode, and even tearing mode in three-dimensional cases are required for simulating a general mixed-mode test. Different distributions with random locations and random orientations of fibers are generated in order to assure the objectivity of results. It is found that the prevailing dissipative mechanism within the reinforced specimens is resulted by the sliding resistance of fiber-matrix interfaces. In addition, owing to the high tensile strength of polypropylene fibers, instead of sudden cracking due to fiber rupture, ductile post-peak responses with tremendous amount of energy dissipation are obtained. Low elastic modulus of polypropylene fibers, on the other hand, leads to negligible change in pre-peak responses as the fibers are added to the mixtures.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…Furthermore, some scholars have considered adding fibers (including steel fibers, polypropylene fibers, etc.) into concrete in order to increase the performances of a corroded RC beam [11][12][13]. They claimed the flexural and shear capacity of fiber-reinforced concrete beams increased considerably.…”

Section: Introductionmentioning

confidence: 99%

Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

Zhang¹,

Tan²,

Wang³

et al. 2019

Applied Sciences

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The purpose of this research is to utilize a more advanced test method for investigating the effect of steel corrosion on the flexural characteristics of a reinforced concrete (RC) beam on a microscopic cracking level. Firstly, over-reinforced RC beam specimens were prepared and corroded using an electrical accelerated steel corrosion setup in different ratios. Subsequently, bending and acoustic emission (AE) tests were performed on all the specimens to obtain their ultimate flexural loads, failure modes and AE signals. Furthermore, rise time/peak amplitude (R/A), ringing counts/duration (AF) and improved b (Ib) values, as the statistical parameters of AE signals, were calculated for indicating the transformation of RC specimens’ crack modes and failure modes under the effect of steel corrosion. Finally, the locations of AE events were obtained by localization technology and compared with the locations of concrete cracks (cracks map). The results revealed that the ultimate flexural load decreases with steel corrosion. The crack tends to transform from shear- to tensile-type along with the increase of the steel corrosion ratio. The trend of the Ib-value curve can reflect the formation and development of cracks; and the larger the duration of violent fluctuations in the Ib-value curve is, the larger the ultimate flexural load of the RC beam is. The region where the crack is located can be judged by the position where the relatively dense distribution of the AE events is.

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Cited by 57 publications

References 30 publications

Effect of Fiber Type, Shape and Volume Fraction on Mechanical and Flexural Properties of Concrete

Effect of Fiber Type, Shape and Volume Fraction on Mechanical and Flexural Properties of Concrete

Fiber bridging in polypropylene‐reinforced high‐strength concrete: An experimental and numerical survey

Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

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