Influence of test parameters on the interlaminar shear strength of FRP bars

Januš, Ondřej; Girgle, Frantisek; Rozsypalová, Iva; Kostiha, Vojtech; Prokeš, Ján; Štěpánek, Petr; Čairović, Đorđe

doi:10.1016/j.compstruct.2022.116061

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…As Figure 8 shows, within the above s / d range, the horizontal shear strength decreases almost linearly with the increase in the span-to-diameter ratio. In past works, a similar trend was reported for FRP bars [ 5 , 70 ] and strips [ 72 ].…”

Section: Resultssupporting

confidence: 85%

“…In most specimens, the failure planes formed asymmetrically on only one side of the externally applied load. This horizontal shear failure morphology is similar to that reported by other researchers [26,32,38,41,44,70].…”

Section: Failure Morphologysupporting

confidence: 91%

“…ASTM D4475-21 [ 49 ] states that experiments indicate that the horizontal shear strength is a function of the specimen span-to-diameter ratio in most materials. In [ 70 ], this parameter was dealt with in detail, and a correction factor was introduced to account for it. According to [ 70 ], by knowing the horizontal shear strength of a given bar, τ H , for any for any s / d (3 ≤ s / d ≤ 6), and using it as the reference strength, the corresponding strength other s / d value can be computed as

where τ H,S is the predicted horizontal shear strength; c is the correction factor; τ H,R is the reference horizontal shear strength; and S and S R are the target and reference specimen span, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The horizontal shear test is not commonly used to evaluate the rate of bar degradation [ 70 ]. Although horizontal or interlaminar shear strength undergoes reduction under certain conditions, especially under prolonged high temperature exposure scenarios [ 4 , 5 , 27 , 28 , 29 , 33 , 38 , 39 , 41 , 74 ], it also exhibits a high degree of variability for the reasons explained earlier.…”

Section: Resultsmentioning

confidence: 99%

“…In [70], this parameter was dealt with in detail, and a correction factor was introduced to account for it. According to [70], by knowing the horizontal shear strength of a given bar, τ H , for any for any s/d (3 ≤ s/d ≤ 6), and using it as the reference strength, the corresponding strength other s/d value can be computed as…”

Section: Influence Of Span-to-diameter Ratio On Horizontal Shear Failurementioning

confidence: 99%

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Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

2023

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Calcium sulfoaluminate cement concrete (CSAC) reinforced by fiber-reinforced polymer (FRP) bars, termed bars for brevity, is a good alternative to steel-reinforced concrete in marine environments due to the corrosion resistance of FRP and the lower pH of CSAC. For the first time, multi-mechanical tests are conducted to compare the durability of glass FRP (GFRP) to that of carbon FRP (CFRP) after exposure to CSAC pore solution. The bars were immersed in a simulated pore solution of CSAC made with either fresh water and river sand or with seawater and sea sand. Solution temperature was held constant at 30 °C, 45 °C or 60 °C for 30, 60, 90 and 180 days of immersion. Tensile, horizontal and transverse shear tests, as well as detailed microstructural analyses, were conducted to determine the level and mechanisms of degradation for each type of bar. Sea salt increases the degradation of both bars, but it degrades GFRP more than CFRP. The bars’ retained tensile strength is a reliable indicator of their durability, while their post-exposure horizontal and transverse shear strengths are found inconsistent and counter intuitive. In the GFRP, the fiber, the epoxy matrix and their interface suffered damage, but in the CFRP, the carbon fiber was not damaged. Under the test conditions in this study, the maximum reduction in the tensile strength of the GFRP was 56.9% while that of CFRP was 15.1%. Based on the relevant ASTM standard, the CFRP bar satisfies the alkaline resistance requirement of the standard in the CSAC pore solution with and without salt, whereas the GFRP bar does not meet the same requirement in the above pore solution with salt.

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Section: Resultssupporting

confidence: 85%

Section: Failure Morphologysupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of Span-to-diameter Ratio On Horizontal Shear Failurementioning

confidence: 99%

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Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

2023

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Study on mechanical properties and molecular simulation of nano‐SiO₂‐modified hybrid fiber reinforced polymer bar under the dry and alkaline environment

Guan,

Xu,

Zhang

et al. 2024

Polymer Composites

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Fiber reinforced polymer (FRP) bars have received extensive promotion and application in the structural engineering. However, due to the limitations inherent in using single material, FRP reinforced concrete structures often encounter issues, such as brittle failure and inadequate energy dissipation, particularly in complex natural environments and under various loading conditions. In this study, the preparation of nano‐SiO2‐modified carbon/basalt hybrid FRP bars was carried out using the pultrusion‐winding process and ultrasonic treatment. The objective was to investigate the influence of the fiber volume ratio and mass fraction of nano‐SiO2 on the mechanical properties of FRP bars under drying and alkaline conditions. Molecular dynamics simulations were performed to construct interface models between fibers and epoxy resin in order to elucidate the toughening mechanism of nano‐SiO2 and the degradation mechanism in alkaline conditions. The research results show that elevating the substitution rate of carbon fibers and incorporating nano‐SiO2 doping bring about alterations in the brittle fracture characteristics of BFRP bars and enhance the post‐yield performance and interlaminar shear properties of hybrid FRP bars, concurrently mitigating the degradation of mechanical properties induced by exposure to alkaline solutions. MD simulations indicate that the addition of nano‐SiO2 improves the binding rate of hydrogen bonds between BF and epoxy resin, resulting in a higher interfacial energy between BF/epoxy resin compared to CF/epoxy resin. Moreover, nano‐SiO2 effectively mitigates the impact of alkaline solutions on the formation of interfacial hydrogen bonds. The findings of this study serve as a valuable reference for the design and application of FRP reinforced concrete structures.Highlights Nano‐SiO2 modified B/CFRP bars made via extrusion‐winding & ultrasonic treatment. Improved mechanical properties and plastic deformation in Nano‐SiO2 modified B/C FRP bars. Nano‐SiO2 inhibits B/CFRP bars degradation in alkaline solution. Nano‐SiO2 bind more at BF/epoxy than CF/epoxy interface. Nano‐SiO2 reduces alkaline solution effect on interfacial H‐bonding.

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Durability of BFRP bars embedded in seawater sea sand coral aggregate concrete in simulated seawater environment: Effects of coral coarse aggregate and cement contents

Zhou

Zhu

Rahman

et al. 2023

Construction and Building Materials

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Influence of test parameters on the interlaminar shear strength of FRP bars

Cited by 6 publications

References 21 publications

Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

Study on mechanical properties and molecular simulation of nano‐SiO₂‐modified hybrid fiber reinforced polymer bar under the dry and alkaline environment

Durability of BFRP bars embedded in seawater sea sand coral aggregate concrete in simulated seawater environment: Effects of coral coarse aggregate and cement contents

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Influence of test parameters on the interlaminar shear strength of FRP bars

Cited by 6 publications

References 21 publications

Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

Durability of GFRP and CFRP Bars in the Pore Solution of Calcium Sulfoaluminate Cement Concrete Made with Fresh or Seawater

Study on mechanical properties and molecular simulation of nano‐SiO2‐modified hybrid fiber reinforced polymer bar under the dry and alkaline environment

Durability of BFRP bars embedded in seawater sea sand coral aggregate concrete in simulated seawater environment: Effects of coral coarse aggregate and cement contents

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Product

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Study on mechanical properties and molecular simulation of nano‐SiO₂‐modified hybrid fiber reinforced polymer bar under the dry and alkaline environment