Experimental Study on Bond Fatigue Between Carbon Fiber-Reinforced Polymer Bars and Seawater–Sea Sand Concrete Under Seawater Immersion and Dry–Wet Cycle Conditions

Buildings, Journal Year: 2025, Volume and Issue: 15(3), P. 438 - 438

Published: Jan. 30, 2025

The durability of carbon fiber-reinforced polymer (CFRP) bars in marine environments is essential for their application seawater–sea sand concrete (SWSSC), especially under cyclic loading conditions. While previous studies primarily focused on static bonding performance, the effects seawater immersion and dry–wet cycles bond fatigue behavior at CFRP–SWSSC interfaces remain underexplored. This study investigated performance CFRP SWSSC cycling Eighteen bar-SWSSC specimens were divided into three categories prepared pull-out tests. varying stress levels (fatigue upper load/static ultimate load) after failure modes, bond–slip behavior, characteristics evaluated. results show that significantly degrade bonds between SWSSC, with an average strength reduction 10.31%. These conditions reduce stiffness while increasing (relative displacement bar–concrete interface) residual–slip (displacement unloading). Moreover, has a greater negative impact than immersion. Higher exacerbate damage crack propagation interface, leading to significant increases both residual-slip. Under similar conditions, higher enhance stiffness. However, excessively high stresses may lead failures. Using experimental data existing constitutive models, customized model was developed. findings highlight severely impair thereby emphasizing importance careful design applications. proposed offers reliable framework predicting enhancing understanding interactions supporting durable infrastructure.

Language: Английский

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Effect of Mechanical Interlocking Damage on Bond Durability of Ribbed and Sand-Coated GFRP Bars Embedded in Concrete Under Chloride Dry–Wet Exposure

Polymers, Journal Year: 2025, Volume and Issue: 17(6), P. 733 - 733

Published: March 11, 2025

The substitution conventional steel reinforcement with glass fiber-reinforced polymer (GFRP) bars is a widely adopted strategy used to improve the durability of concrete structures in chloride environments, offering benefits such as enhanced corrosion resistance, reduced maintenance needs, and increased service life. This study investigates bond behavior between under long-term dry–wet cycling exposure. Pull-out tests were conducted on various specimens subjected exposure durations 0, 3, 6, 9, 12 months. experimental results indicate that, after months cycling, strength retention rates threaded ribbed GFRP length 5d, sand-coated 7d 57.9%, 62.2%, 63.8%, respectively. To predict GFRP–concrete performance exposure, novel model for embedded concrete, considering mechanical interlocking effect ribs, was proposed validated by test results. overall prediction errors RG-5d, SG-5d, RG-7d 0.98, 0.81, 0.93, Additionally, sensitivity analysis main parameters model. Finally, deterioration estimated using These findings are expected provide valuable insights into life members environments.

Language: Английский

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Bond performance between stainless steel reinforcement and seawater sea-sand geopolymer concrete

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112680 - 112680

Published: April 1, 2025

Language: Английский

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Bond behavior and bond strength model for ribbed FRP bar in FRP-confined concrete

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 449, P. 138318 - 138318

Published: Sept. 17, 2024

Language: Английский

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