Residual strength and toughness properties of 3D, 4D and 5D steel fiber-reinforced concrete exposed to high temperatures

Güler, Soner; Akbulut, Zehra Funda

doi:10.1016/j.conbuildmat.2022.126945

Cited by 31 publications

(9 citation statements)

References 39 publications

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“…Soner [19] investigated the variation of mass loss, residual strength, and toughness properties of 3D, 4D, and 5D steel fiber reinforced concrete with temperature values and found that the mass loss, residual strength, and toughness of the specimens do not change significantly after 300℃, but decrease significantly after 500℃ and 800℃. In addition, 5D fibers had higher residual strength and toughness.…”

Section: Steel Fiber Concretementioning

confidence: 99%

Research Status and Outlook on High Temperature Performance of Fiber Concrete

Wu,

Miao,

et al. 2024

SJT

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Fiber concrete is a novel composite material that has widespread use in the construction industry. However, high-temperature environments can cause severe damage to concrete structures. Therefore, it is essential to study the refractory properties and microscopic changes of fiber concrete under such conditions. This paper reviews the current research status of steel fiber concrete, polypropylene fiber concrete, and hybrid fiber concrete, which are commonly used in practical engineering, and summarizes their respective roles in concrete by combining theory and practice. The review also looks forward to future research directions and development trends to provide a reference for related research. Studies have demonstrated that adding a suitable amount of fibers can significantly enhance the high-temperature performance of concrete. However, different fiber types have varying effects on concrete. The high-temperature performance of fiber concrete is also influenced by various factors, including concrete mix ratio, fiber type, and admixture. Future research should focus on investigating the mechanism and microscopic changes in the high-temperature performance of fiber concrete, developing new fiber materials, optimizing concrete mixing ratios, and exploring the application of fiber concrete in practical engineering.

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Section: Steel Fiber Concretementioning

confidence: 99%

Research Status and Outlook on High Temperature Performance of Fiber Concrete

Wu,

Miao,

et al. 2024

SJT

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“…Dehghani and Aslani 47 experimentally examined the effect of 3D, 4D, and 5D hooked‐end type on the pull‐out behavior of fibers embedded in cementitious composites and it was found that the use of more bends at hooked‐end (i.e., 5D vs. 3D) significantly enhances the bond strength of fibers. Guler and Funda 48 carried out experimental work to examine the compressive and flexural strengths and toughness capacities of 3D, 4D, and 5D fibers under high temperatures and it was found that these capacities reduced significantly as temperature increased. Mohamed et al 49 carried out a comprehensive review of research on the performance of steel fiber‐reinforced lightweight concrete.…”

Section: Literature Reviewmentioning

confidence: 99%

Constitutive model for plain and fiber‐reinforced lightweight concrete under compression

Al‐Naimi,

Abbas

2023

Structural Concrete

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In this research work, experimental investigations of the compressive behavior of plain and fiber‐reinforced lightweight‐aggregate concrete have been carried out (this formed part of a wider study, which also examined tensile and flexural behaviors). Compression mechanical properties were established in the studies and a generic constitutive compressive σ–ε model for both plain and fibrous lightweight concrete was derived and validated against experimental results from the present studies and previous research in the literature involving different types of lightweight aggregates, concrete strengths, and steel fibers. The reliability of predictions of the constitutive model was also checked against existing fibrous concrete models. A fiber‐reinforcing factor was also introduced taking into account the fiber volume fraction, fiber length and diameter, the number of fiber bends, and concrete compressive strength. As such, this was considered a better descriptor of the material than simply using the fiber volume fraction. The lightweight aggregates examined in the experimental study were recycled from fly ash waste and the fibers were hooked‐ended with single, double, and triple bends (corresponding to DRAMIX steel fibers 3D, 4D, and 5D types, respectively). The fibers were added at volume fractions Vf of 1% and 2% and the experimental studies were carried out using standard cube and cylinder uniaxial compression test specimens. It was concluded that the higher the number of bends and fiber content, the more pronounced the enhancement provided by the fibers to the compressive strength and ductility responses. All steel fibers used in the present studies were found to significantly improve the compressive toughness, while only 4D and 5D fibers (i.e., those with double and triple end bends) enhanced the compressive strength by up to 12% and 15%, respectively. It was also found that the elastic properties of plain lightweight concrete remained unaffected by the addition of fibers.

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“…In 1981, the Swedish engineer Meier proposed the concept of fiber-reinforced materials (FRP) and reinforced it with adhesive CFRP for the first time on Ebach Bridge. Since then, fiber-reinforced materials have been developed with many different types of FRP materials and have been widely used in other fields [1]. It can be roughly divided into three categories: carbon fiber CFRP, polymer fiber including aramid fiber (AFRP), and inorganic fiber including glass fiber (GFRP) [2,3], which has a good repair and protection effect on concrete structures [4].…”

Section: Introductionmentioning

confidence: 99%

Investigation on damage evolution mechanism of various FRP strengthened concrete subjected to chemical-freeze-thaw coupling erosion

Li,

Wang,

et al. 2024

PLoS ONE

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The corrosion resistance of FRP-reinforced ordinary concrete members under the combined action of harsh environments (i.e., alkaline or acidic solutions, salt solutions) and freeze-thaw cycles is still unclear. To study the mechanical and apparent deterioration of carbon/basalt/glass/aramid fiber cloth reinforced concrete under chemical and freeze-thaw coupling. Plain concrete blocks and FRP-bonded concrete blocks were fabricated. The tensile properties of the FRP sheet and epoxy resin sheet before and after chemical freezing, the compressive strength of the FRP reinforced test block, and the bending capacity of the prismatic test block pasted with FRP on the prefabricated crack side were tested. The deterioration mechanism of the test block was analyzed through the change of surface photos. Based on the experimental data, the Lam-Teng constitutive model of concrete reinforced by alkali-freeze coupling FRP is modified. The results indicate that, in terms of apparent properties, with the increase in the duration of chemical freeze-thaw erosion, the surface of epoxy resin sheets exhibits an increase in pores, along with the emergence of small cracks and wrinkles. The texture of FRP sheets becomes blurred, and cracks and wrinkles appear on the surface. In terms of failure modes, as the number of chemical coupling erosion cycles increases, the location of failure in epoxy resin sheets becomes uncertain, and the failure plane tilts towards the direction of the applied load. The failure mode of FRP sheets remains unchanged. However, the bonding strength between FRP sheets and concrete decreases, resulting in a weakened reinforcement effect. In terms of mechanical properties, FRP sheets undergo the most severe degradation in the coupled environment of acid freeze-thaw cycles. Among them, GFRP experiences the largest degradation in tensile strength, reaching up to 30.17%. In terms of tensile performance, the sheets rank from highest to lowest as follows: CFRP, BFRP, AFRP, and GFRP.As the duration of chemical freeze-coupled erosion increases, the loss rate of compressive strength for specimens bonded with CFRP is the smallest (9.62% in salt freeze-thaw environment), while the loss rate of bearing capacity is higher for specimens reinforced with GFRP (33.8% in acid freeze-thaw environment). In contrast, the loss rate of bearing capacity is lower for specimens reinforced with CFRP (13.6% in salt freeze-thaw environment), but still higher for specimens reinforced with GFRP (25.8% in acid freeze-thaw environment).

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Residual strength and toughness properties of 3D, 4D and 5D steel fiber-reinforced concrete exposed to high temperatures

Cited by 31 publications

References 39 publications

Research Status and Outlook on High Temperature Performance of Fiber Concrete

Research Status and Outlook on High Temperature Performance of Fiber Concrete

Constitutive model for plain and fiber‐reinforced lightweight concrete under compression

Investigation on damage evolution mechanism of various FRP strengthened concrete subjected to chemical-freeze-thaw coupling erosion

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