Effect of freeze-thaw cycles on tensile properties of CFRP, bond behavior of CFRP-concrete, and flexural performance of CFRP-strengthened concrete beams

Fu-xiang, Jiang; Han, Xiaofeng; Wang, Yutian; Wang, Penggang; Zhao, Tong; Zhang, Kai

doi:10.1016/j.coldregions.2021.103461

Cited by 16 publications

(5 citation statements)

References 48 publications

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“…The beam failed at 462 8C, and the failure mode was that the top concrete was crushed. Jiang et al (2022) proposed that with the increase of freeze-thaw cycles, the failure mode of CFRP at a tensile state changed from fracture failure to splitting failure, and the tensile strength and elongation decreased. In a freeze-thaw climate, the failure mode of CFRP-strengthened RC beams shifts from bending to shear, and the ultimate load drops.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on shear performance of CFRP-strengthened RC beams with geopolymer adhesive

Liu

2023

IJSI

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PurposeThe effects of carbon fiber reinforced polymer (CFRP) reinforcement form, adhesive type and pre-crack width on failure mode, shear capacity, deflection response, CFRP strain response and crack patterns of strengthened specimens were investigated.Design/methodology/approachThis paper presents a geopolymer adhesive that matches the performance requirements of CFRP adhesive, which is applied to pre-cracked beams reinforced with CFRP strips. FindingsFor specimens with varying structural properties, two failure modes, the CFRP-concrete interface substrate failure and the fracture failure of CFRP, are observed. Moreover, the shear capacity, ultimate deflection and bending stiffness of the U-shaped CFRP-strengthened beams are enhanced in comparison to the complete-wrapping CFRP-strengthened beams. With an increase in pre-crack width, the increase in shear capacity of RC beams shear-strengthened with CFRP strips is less than that of non-cracked beams, resulting in a limited influence on the stiffness of CFRP-strengthened beams. The comparison of experimental results showed that the proposed finite element model (FEM) effectively evaluated the mechanical characteristics of CFRP-strengthened RC beams.Originality/valueTaking into consideration the reinforcement effect and the concept of environmental protection, the geopolymer adhesive reinforcement scheme is preferable to applying epoxy resin to the CFRP-strengthened RC beams.

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Section: Introductionmentioning

confidence: 99%

Experimental study on shear performance of CFRP-strengthened RC beams with geopolymer adhesive

Liu

2023

IJSI

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“…The chemical medium penetrates, diffuses and reacts chemically inside the composites, thus exfoliating the bonding interface and causing structural instability and strength loss (Batuwitage et al , 2017; Zhu et al , 2017). A few scientific papers (Jiang et al , 2022; Sun et al , 2016b; Xian et al , 2022; Zhu et al , 2016) have found that the bending strength and the interlaminar shear strength of the composites decreased after experiments were conducted in the chemical media solution system. In addition, concerning the use of CFRP materials with metals, galvanic corrosion effects also affect the degradation of CFRP (Abdulsalam and Presuel-Moreno, 2021; Zhang et al , 2019), further the degradation of composites causing changes in microstructure and state, and the microstructure of CFRP has a great influence on its electrochemical behavior (Zhang et al , 2020), so in addition to the commonly used performance tests of CFRP, the degradation of CFRP can also be studied by electrochemical means.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical impedance characteristics and degradation behaviors of carbon fiber reinforced composite attacked by HF solution

Gao

Yang³

et al. 2023

ACMM

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Purpose The purpose of this study is to ensure the safe use of carbon fiber composite pressure vessels in the nuclear industry environment. Design/methodology/approach This study investigated the degradation behaviors of carbon fiber reinforced composite (CFRP) using the specific corrosive media HF solution, with a focus on the damage to the surface epoxy layer. The degradation behaviors of CFRP in HF solution were examined by electrochemical methods and surface characterization, using HCl, NaCl and NaF solution for comparison. Findings The results showed that the specimen in HF solution will have a value of |Z|0.01 Hz one order of magnitude lower, a substantially lower contact angle, more breakage of the surface epoxy and the stronger O─H peak and weaker C─O─C peak in the Fourier transform infrared spectrum, indicating severe hydrolytic damage to the surface epoxy. Originality/value The work focuses on the degradation damage to CFRP surface epoxy by specific corrosive media HF.

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“…Concrete is currently the most used building material 1–7 . However, under the effect of freezing and thawing, chloride penetration, sulfate attack, etc., the reinforced concrete structure often cannot reach the designed service life 8–13 . In order to maintain the performance of the reinforced concrete structure, it needs to be repaired and strengthened.…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

Wang

Han

Wang

et al. 2023

Structural Concrete

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Whether the performance of carbon fiber‐reinforced polymer (CFRP)‐strengthened concrete structure is affected by chloride penetration is the key to the application under chloride environments. In this paper, the effect of chloride penetration on tensile properties of CFRP sheet, bond behavior of CFRP‐concrete, and flexural performance of CFRP‐strengthened concrete beams were studied. Results show that chloride penetration has no effect on the elastic modulus of the CFRP sheet. The tensile strength and elongation of the CFRP sheet decrease with the exposure time increase, reducing by 10% and 12.7% after 240 days. The interface failure of CFRP‐concrete is likely to occur on the concrete surface. As the exposure time increases, the interface failure develops toward the epoxy resin layer; the sliding stiffness and end slip of the interface decrease. However, the ultimate bearing capacity of the interface first increases and then decreases. As the exposure time increase, the effective bonding length gradually increases, and the failure mode of CFRP‐strengthened beams changes from bending failure to shear failure. After 120 days, the ultimate bearing capacity of the beams is significantly reduced. From three parts of materials, interfaces, and components to provide an evaluation basis for the use, regular detection, and life prediction of CFRP‐strengthened reinforced concrete beams under chloride environments.

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Effect of freeze-thaw cycles on tensile properties of CFRP, bond behavior of CFRP-concrete, and flexural performance of CFRP-strengthened concrete beams

Cited by 16 publications

References 48 publications

Experimental study on shear performance of CFRP-strengthened RC beams with geopolymer adhesive

Experimental study on shear performance of CFRP-strengthened RC beams with geopolymer adhesive

Electrochemical impedance characteristics and degradation behaviors of carbon fiber reinforced composite attacked by HF solution

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

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