Mechanical performance of concrete strengthened by modified epoxy resin bonded CFRP

Li, Bowen; Hu, Ruixue; Bai, Song; Dong, Wanguo; Zhao, Zhanliang; Song, Lingguang

doi:10.1080/01694243.2021.1984086

Cited by 7 publications

(2 citation statements)

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“…For the resin matrix, its function is to fix and protect the fibers in composites and achieve superior mechanical properties [ 7 , 8 ]. For the adhesive, it is mainly used to strengthen and repair the structures through the interface bonding between the base material (such as steel and concrete components) and reinforcement materials (such as FRP) [ 9 , 10 , 11 , 12 ]. The polymer with high toughness, strength, durability and fatigue resistance is significant for material design and engineering application [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Durability Behaviors of Thermoplastic Polypropylene and Thermosetting Epoxy Exposed to Elevated Temperature, Water Immersion and Sustained Bending Loading

Zhou

Tian

et al. 2022

Polymers

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The long-term degradation of epoxy as the matrix and adhesive serviced in harsh environments plays a key role in engineering applications. Understanding how to improve the toughness and durability of epoxy through reasonable material replacement and design is significant to prolong the service life of engineering structures. In the present paper, thermoplastic polypropylene and thermosetting epoxy were exposed in a coupling environment of elevated temperature, water immersion and sustained bending loading. The evolutions of mechanical and thermal properties were further analyzed and compared. Long-term life prediction was conducted to evaluate the corrosive resistances of polypropylene and epoxy. It can be found that polypropylene has better hydrophobic behavior compared to epoxy. At 80 °C, the ratios of the diffusion coefficient and saturated water uptake between the two matrices were 114.4 and 2.94. At the longest immersion time of 90 days, the degradation percentages of tensile strength were 4.7% (40 °C), 7.5% (60 °C) and 8.8% (80 °C), respectively, which had the higher strength retention (>90%). The maximum strength increase in the multiples of polypropylene/epoxy and polypropylene/polyurethane was 1.95 and 1.75, respectively. The bending loading led to a maximum increase in tensile strength (~1.47%) owing to the oxygen isolation effect. The degradation mechanism was attributed to the active functional groups from the production process reacting with oxygen, resulting in the fracture of the local chain segment. By comparison, water molecules reacted with the hydroxyl groups or interrupted the intermolecular Van der Waals force/hydrogen bond of the epoxy, resulting in irreversible hydrolysis and property degradation. Through the comparison, it can be found that polypropylene and its composites have outstanding properties compared to epoxy, which can make them achieve great application prospects in engineering applications when considering a complex service environment.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Durability Behaviors of Thermoplastic Polypropylene and Thermosetting Epoxy Exposed to Elevated Temperature, Water Immersion and Sustained Bending Loading

Zhou

Tian

et al. 2022

Polymers

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“…as the width/thickness ratio of stainless steel pipe and the number of CFRP layers and proposed an inner steel pipe model to reveal the axial compression characteristics of CFRP square concrete with a stainless steel outer pipe [10]. Li et al proposed a modified epoxy resin as the binder of CFRP and concrete and tested the comprehensive strength of the bonding interface and the flexural performance of CFRP-reinforced concrete [11]. Ding et al established and verified the concentric model of CFRP, concrete, and steel pipe based on the theory of continuum mechanics [12].…”

Section: Introductionmentioning

confidence: 99%

Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading

Shu-guang

Yang

et al. 2022

Materials

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In underground engineering, reinforcement is a necessary means to ensure the stability of surrounding rock. Due to the stress redistribution caused by excavation disturbances, the reinforced rock mass is frequently subjected to loading and unloading, and its mechanical properties change accordingly. Based on the above engineering practice, using pasted circular CFRP, an approximate simulation of the rock reinforcement effect of bolt and shotcrete support was performed. Triaxial cyclic loading and unloading tests of reinforced sandstone were carried out, and the influence of different reinforcement schemes on the mechanical properties was compared and analyzed. Furthermore, the strengthening mechanism, damage evolution, and energy transformation mechanism of CFRP are discussed. The results showed that the peak strength increased about 14.2% and 23.8% with the two reinforced schemes, and the residual strength increased about 27.3% and 52.8% with the increase in the area reinforced by CFRP. Under the same confining pressure and strain conditions, the characteristic energy density and elastic energy ratio increased with an increase in the reinforcement area, but the damage variable decreased. It is proved that CFRP can improve energy absorption efficiency, enhance the energy storage limit, and reduce dissipation efficiency. By inhibiting the propagation of internal fissures and limiting the energy dissipation during fractures, the rock mass can be restrained and strengthened.

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Analysis of concrete mechanical properties when adding type-E glass fibers

et al. 2023

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Mechanical performance of concrete strengthened by modified epoxy resin bonded CFRP

Cited by 7 publications

References 50 publications

Comparative Study of Durability Behaviors of Thermoplastic Polypropylene and Thermosetting Epoxy Exposed to Elevated Temperature, Water Immersion and Sustained Bending Loading

Comparative Study of Durability Behaviors of Thermoplastic Polypropylene and Thermosetting Epoxy Exposed to Elevated Temperature, Water Immersion and Sustained Bending Loading

Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading

Analysis of concrete mechanical properties when adding type-E glass fibers

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