Flexural behaviour of concrete beams reinforced with steel-FRP composite bars

Etman, Emad; Mahmoud, Mohamed H.; Hassan, Ali; Mowafy, Mohamed H.

doi:10.1016/j.istruc.2023.02.098

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…Some studies have pointed out that although the chloride and sulfate components contained in SSC can play a certain role as early strength agents in concrete, the erosion deterioration effect for steel reinforcement is quite obvious. Reducing the bonding properties between concrete and reinforcement will have a serious impact on the mechanical properties and durability of concrete components and even buildings [14][15][16]. Therefore, seeking a material with excellent mechanical properties of steel reinforcement and certain corrosion resistance has become the research focus of many scholars.…”

Section: Introductionmentioning

confidence: 99%

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

Guan,

Wang,

Xin

et al. 2024

Materials

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A total of 66 sets of pullout specimens were prepared to investigate the bonding properties of basalt fiber-reinforced polymer reinforcement (hereinafter referred to as BFRP) with seawater sand concrete (hereinafter referred to as SSC). The volume dosages of mono-doped glass fibers and mono-doped polypropylene fibers were 0.1%, 0.2%, and 0.3%; the total volume dosage was set to be constant at 0.3%; and the doping ratios of the hybrid fibers were 1:2, 1:1, and 2:1. The effect on the bonding performance of BFRP reinforcement with SSC was studied on the condition of the diameter D of the BFRP reinforcement being 12 mm; the bond length of SSC being 3D, 5D, and 7D; and the surface characteristics of the reinforcement being sandblasted and threaded. The research showed that due to internal cracks in the matrix, salt crystals in the pores, chloride salts with high brittleness and expansion, as well as sulfate corrosion products such as “Frederick salts” in SSC, the concrete became brittle, resulting in more brittle splitting failures during the pullout test. Doped fibers can increase the ductility effect of concrete, but the bonding effect between the threaded fiber reinforcement and the SSC was not as good as that of the sandblasting group. When the bond length was 5D, the bonding effect between the BFRP reinforcement and SSC was the best, and the bonding performance of the experimental group with doped fibers was better than that of the threaded group. Finally, by combining the ascending segment of the Malvar model with the descending segment of the improved BPE model, a constitutive relationship model suitable for the bond–slip curve between BFRP reinforcement and SSC was fitted, which laid a theoretical foundation for future research on SSC.

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Section: Introductionmentioning

confidence: 99%

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

Guan,

Wang,

Xin

et al. 2024

Materials

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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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Experimental study on axial compression behavior of square pultruded GFRP tubular stub column

Xing,

Zhu,

Liu

et al. 2024

Case Studies in Construction Materials

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Flexural behaviour of concrete beams reinforced with steel-FRP composite bars

Cited by 7 publications

References 45 publications

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

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

Experimental study on axial compression behavior of square pultruded GFRP tubular stub column

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Flexural behaviour of concrete beams reinforced with steel-FRP composite bars

Cited by 7 publications

References 45 publications

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

Study on the Bonding Performance of BFRP Bars with Seawater Sand Concrete

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

Experimental study on axial compression behavior of square pultruded GFRP tubular stub column

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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