海水浸泡CFRP筋性能退化试验及其退化机理

doi:10.11896/cldb.24070052

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Abstract In order tostudy the performance degradation of carbon fiber reinforced polymer (CFRP) bars after immersion in real seawater, four kinds of CFRP bars with different surface morphology were immersed in real seawater. The variation rules of the tensile strength and the elastic modulus were investigated through static tensile tests. Meanwhile, the water absorption, surface morphology, microscopic morphology and material composition of the bars were analyzed to explain the degradation mechanism of CFRP bars by SEM, FTIR, and X-ray computed tomography. The results show that, with 0—30 d of immersion, the bar mainly undergoes water absorption and expansion, then the hydrolysis of the resin intensifies after 30 d, and the greater the degree of hydrolysis of the resin, the lower the residual strength of the bar. The tensile strength of CFRP bars decreases with the increase of immersion time, while the residual strength with 90 d of immersion is above 95% of the base bar. Surface morphology has a large impact on the degradation, where surface grooved ribs can accelerate the degradation of the bar, while the sand layer can enhance its durability.

Key words： CFRP bars seawater immersion tensile strength micro-detection degradation mechanism

Published: 25 July 2025 Online: 2025-07-29

CLC number:

TB332

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	Articles by authors
	GAO Jing
	LIU Yuwei
	XU Penghai
	XU Gongyi

Cite this article:

GAO Jing,LIU Yuwei,XU Penghai, et al. Test on Degradation of Seawater-immersed CFRP Bars and Analysis on the Degradation Mechanism[J]. Materials Reports, 2025, 39(14): 24070052-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24070052 OR https://www.mater-rep.com/EN/Y2025/V39/I14/24070052

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