Analytical predictive model for the long-term bond performance of CFRP tendons in concrete

Toumpanaki, Eleni; Lees, Janet M.; Terrasi, Giovanni P.

doi:10.1016/j.compstruct.2020.112614

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…Epoxy resin is favored for its outstanding adhesion properties and compatibility with carbon fibers, thereby enhancing the tensile performance of concrete structures. According to the table, the diameter of CFRP tendons ranges from 4 mm [ 132 ] to 32 mm [ 133 ]. This wide diameter range makes CFRP tendons highly suitable for use in construction projects.…”

Section: Characteristics and Performance Of Frp Tendonsmentioning

confidence: 99%

Performances and properties of steel and composite prestressed tendons – A review

Rafieizonooz,

Jang,

Kim

et al. 2024

Heliyon

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Section: Characteristics and Performance Of Frp Tendonsmentioning

confidence: 99%

Performances and properties of steel and composite prestressed tendons – A review

Rafieizonooz,

Jang,

Kim

et al. 2024

Heliyon

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“…With high stiffness and strength, good durability, and easiness of operation, carbon fiber-reinforced polymer (CFRP) sheets are widely used for the reinforcement of concrete structures in marine applications. − A layer of epoxy is often used between the CFRP layer and substrate concrete to enhance adhesion, as shown in Figure a. During the service life, the CFRP-reinforced structures are inevitably exposed to a hygrothermal environment involving the combined effects of temperature and aggressive chemicals. − The aggressive chemicals, such as Na and Cl ions, as well as water molecules, penetrate into the interfacial regions of the composites and cause debonding. , This degradation is reported to accelerate at elevated temperatures .…”

Section: Introductionmentioning

confidence: 99%

Interfacial Degradation of Calcium Silicate Hydrate and Epoxy under a Hygrothermal Environment: An Experimental and Molecular Model Study

Luo

Zhang

et al. 2023

J. Phys. Chem. C

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The adhesion at the concrete/epoxy interface is crucial to the reinforcement of carbon fiber-reinforced polymer (CFRP) sheets. The multiscale mechanism of adhesion, particularly under a hygrothermal environment, yet remains largely unclear. This paper combines molecular dynamics (MD) and synthesis experiments of a novel single-phase calcium silicate hydrate (C-S-H) and epoxy composite to investigate the combined effects of aggressive chemicals and temperature on the bonding properties. MD models were constructed under various conditions on C-S-H/epoxy composites, whose equilibrium configuration, dynamic property, bond connection, interfacial interaction energy, and mechanical properties were quantified. In addition, the experiments were carried out under different temperatures and humidity conditions to explore the macroscopic splitting tensile property of the composites and further validate the MD results. The MD results suggest that the Ca ions on the C-S-H surface are crucial to the adhesion by forming Ca−O and Ca−N bonds with epoxy. However, these bonds were reduced in the presence of water molecules, with a reduction also of the interfacial energy. The degradation effects are exacerbated by the presence of NaCl solution, as Na ions gather around the interfacial region of C-S-H/ epoxy, further accumulating water molecules by forming hydrated ion clusters. This process is accelerated by elevated temperature. The experiment results suggest that without the influence of NaCl solution, a moist C-S-H surface turns to gain a stronger bonding with epoxy when the curing temperature is higher (40, 60 °C). Meanwhile, the bonding properties of a dry C-S-H surface and epoxy are less sensitive to temperature. This work provides new insight into understanding the bonding mechanism on the C-S-H/epoxy interface and may benefit the engineering application of CFRP-concrete reinforcement.

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“…It is reported that carbon-fiber-reinforced polymer (CFRP) has better anticorrosive properties than glass-fiber-reinforced polymer in alkaline and hygrothermal environments (Pan and Yan, 2021;Al-Jelawy and Mackie, 2020;Al-Jelawy, 2013;Guo et al, 2023). Furthermore, the durability of the interfacial CFRP barsconcrete bond is superior to that of the interfacial GFRP bars-concrete bond (Toumpanaki et al, 2020;Micelli and Nanni, 2004). For example, the retention of the interfacial bond strength of GFRP bars-concrete and CFRP barsconcrete composites is 80.4% and 92.9% respectively, after 90 days of immersion in water (Davalos et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

Pan

et al. 2023

Advances in Structural Engineering

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Glass-fiber-reinforced polymer (GFRP) bars have been widely used as a reinforcement in concrete, and glass fibers are susceptible to reacting with alkali ions in concrete pores. Thus, carbon fibers are wrapped around GFRP bars to produce carbon/glass hybrid fiber-reinforced polymer (HFRP) bars so as to promote the durability of the internal GFRP bars in concrete. This work studies the durability of the interfacial bond between GFRP bars/HFRP bars and concrete using pullout tests. The specimens are tested after immersion in distilled water for 0, 150, 255, and 544 days. The failure of the GFRP bar–concrete composite is due to damage to the GFRP bar, while the HFRP bar–concrete composite fails because of a combination of the scratching of the HFRP bar and the failure of the concrete. Both HFRP and GFRP bars are scratched as the immersion period extends. Further, the strength of the bond between the HFRP bar and concrete is lower than that of the bond between the GFRP bar and concrete, while the bond stiffness of the HFRP bar–concrete composite is higher than that of the GFRP bar–concrete composite. The bond strength of the HFRP bar–concrete and GFRP bar–concrete composites increases in the early immersion periods but decreases after 544 days of immersion in water. The retention of the bond strength of the HFRP bar–concrete composite is superior to that of the GFRP bar–concrete composite. The carbon fiber coat is proven to improve the durability of the bond between HFRP bars and concrete in water. A formula for predicting the bond strength of HFRP bar–concrete and GFRP bar–concrete composites in water is also developed. Finally, the modeling results demonstrate that the bond strength retention of the HFRP bar–concrete and GFRP bar–concrete composite is 76% and 46% after 50 years of service time, respectively.

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Analytical predictive model for the long-term bond performance of CFRP tendons in concrete

Cited by 14 publications

References 30 publications

Performances and properties of steel and composite prestressed tendons – A review

Performances and properties of steel and composite prestressed tendons – A review

Interfacial Degradation of Calcium Silicate Hydrate and Epoxy under a Hygrothermal Environment: An Experimental and Molecular Model Study

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

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