Improving corrosion resistance of BFRP bars by coating CNTs modified resin in simulated pore solution of seawater sea sand concrete

Feng, Guangyan; Ou, Yunfu; Rahman, Md. Zillur; Zhou, Linlin; Hongwei, Zhao; Chen, Qingling; Mao, Dali; Zhu, Deju

doi:10.1016/j.conbuildmat.2023.131945

Cited by 51 publications

(1 citation statement)

References 51 publications

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“…Fiber reinforced composites (FRP) are widely used in the field of reinforced concrete structure due to their advantages of lightweight and high strength, corrosion resistance, and convenient construction [2][3][4], especially in harsh environments such as the ocean, where reinforcement and erosion prevention work at the same time [5,6]. In recent years, more research on the material properties of FRP and FRP reinforced concrete members [7][8][9][10] have been carried out, and the corresponding technical regulations have been formulated [11][12][13] and applied in several practical projects [14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Chen,

Shen,

Zheng

et al. 2024

Phys. Scr.

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Facing the substantial protection requirements for reinforced concrete structures exposed to severe erosion conditions, a novel composite material(Basalt Fiber Reinforced Polymer, BFRP) based on epoxy silicone resin as a matrix was introduced in this study. This material exhibits notable enhancements in resistance to acid and alkali corrosion, ultraviolet irradiation, as well as high and low temperature extremes. However, it exhibits lower elastic modulus and higher ductility. To evaluate the effectiveness of this new BFRP composite material in reinforced concrete structures, a comprehensive investigation was conducted by model testing, numerical simulations, and theoretical analysis. This study analyzed the impact of wrapping configuration, number of wrapping layers, concrete strength, and spacing-to-bandwidth ratio on the mechanical properties of concrete square columns. The findings revealed that the loading curve trends for specimens reinforced with the new BFRP sheet and CFRP sheet (Carbon Fiber Reinforced Polymer, CFRP) were almost similar, although the reinforcement effect was comparatively worse for the former. When both layers were fully applied, the axial compression bearing capacity increased by 28.45% and 64.73%, respectively. The number of wrapping layers and the parameters related to concrete strength significantly influenced the reinforcement effect, whereas the influence of spacing-to-bandwidth parameters was less pronounced. Current specifications demonstrate suitable applicability for CFRP-reinforced specimens but limited applicability for BFRP. The calculation model proposed in this paper accurately predicted the axial compression bearing capacity of a new BFRP-reinforced columns, with an error margin kept within 5%.

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Section: Introductionmentioning

confidence: 99%

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Chen,

Shen,

Zheng

et al. 2024

Phys. Scr.

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Durability of carbon/basalt hybrid fiber reinforced polymer bars immersed in alkaline solution

Fu,

Xu,

et al. 2024

Polymer Composites

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Using basalt fiber‐reinforced polymer (BFRP) bars to substitute for steel rebar in seawater sea‐sand concrete (SSC) members is one of effective solutions to steel corrosion. However, there is a concern about the durability of BFRP due to the alkaline of SSC. In this study, a layer of carbon fibers coating (volume fraction was set at 10% and 20%) was used to improve the alkaline resistance of BFRP, which named as carbon/basalt fiber‐reinforced polymer (C/BFRP) hybrid bars. The tensile properties, interlaminar shear strength, and water absorption and diffusion behavior of the C/BFRP were examined by laboratory acceleration methods. The immersion solution temperatures were set at room temperature, 40 and 60°C, immersion mediums were tap‐water and two kinds of alkaline solutions (pH = 10 or 13). Carbon fiber coating is beneficial for improving the mechanical properties of the composite. The higher the fiber volume fraction, the better the long‐term resistance of C/BFRP can be found. However, carbon‐basalt fiber interface is still a weak part in the durability of C/BFRP. The higher the volume fraction of the coating carbon fibers, the greater the quasi‐equilibrium water uptake, which can be attributed that the smaller diameter of carbon fibers embedded the voids between basalt fibers. Reducing environment alkalinity is also beneficial for increasing the service life of C/BFRP, and the tensile strength retention increased by 12% when pH decreased from 13 to 10 after 50‐year.Highlights Carbon fiber coating is beneficial for improving the properties of BFRP. Carbon‐basalt fiber interface is a weak part for the durability of C/BFRP. Reducing alkalinity can improve the durability of BFRP.

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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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Improving corrosion resistance of BFRP bars by coating CNTs modified resin in simulated pore solution of seawater sea sand concrete

Cited by 51 publications

References 51 publications

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Durability of carbon/basalt hybrid fiber reinforced polymer bars immersed in alkaline solution

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

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Improving corrosion resistance of BFRP bars by coating CNTs modified resin in simulated pore solution of seawater sea sand concrete

Cited by 51 publications

References 51 publications

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Experimental-numerical study on axial compression performance of square concrete columns confined by new-type BFRP

Durability of carbon/basalt hybrid fiber reinforced polymer bars immersed in alkaline solution

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

Contact Info

Product

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About

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