海水海砂混凝土孔溶液关键离子侵蚀下GFRP筋的性能演变

doi:10.16552/j.cnki.issn1001-1625.2025.0762

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (11): 3990-3999.DOI: 10.16552/j.cnki.issn1001-1625.2025.0762

海水海砂混凝土孔溶液关键离子侵蚀下GFRP筋的性能演变

金祖权^1,2,3, 王宏^1,2,3, 逄博^1,2,3, 赵玲玲^1,2,3, 许明飞^1,2,3, 沈奥^1,2,3

1.青岛理工大学土木工程学院,青岛 266520;
2.海洋环境混凝土技术教育部工程研究中心,青岛 266520;
3.教育部低碳海洋混凝土技术国际联合实验室,青岛 266033

收稿日期:2025-07-31 修订日期:2025-09-16 出版日期:2025-11-15 发布日期:2025-12-04
作者简介:金祖权(1977—),男,博士,教授。主要从事海洋混凝土的研究。E-mail:jinzuquan@126.com
基金资助:
国家自然科学基金(52225905,U2106221)

Performance Degradation of GFRP Bars under Erosion of Key Ions in Pore Solution of Seawater and Sea-Sand Concrete

JIN Zuquan^1,2,3, WANG Hong^1,2,3, PANG Bo^1,2,3, ZHAO Lingling^1,2,3, XU Mingfei^1,2,3, SHEN Ao^1,2,3

1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China;
2. Engineering Research Center of Concrete Technology under Marine Environment, Ministry of Education, Qingdao 266520, China;
3. International Cooperative Joint Laboratory for Low-Carbon Marine-Concrete Technology, Ministry of Education, Qingdao 266033, China

Received:2025-07-31 Revised:2025-09-16 Published:2025-11-15 Online:2025-12-04

摘要/Abstract

摘要： 为阐明纤维增强聚合物(FRP)筋中树脂与纤维在海水海砂混凝土(SSC)孔溶液关键离子侵蚀下的劣化机理,本文研究了玻璃纤维增强聚合物(GFRP)筋在水、NaCl溶液、KOH溶液、Ca(OH)₂溶液、NaOH溶液及SSC模拟孔溶液中的性能劣化规律。通过接触角测试、拉伸与剪切强度试验、μ-XRF及SEM分析,系统探究了不同腐蚀环境中环氧树脂及GFRP筋的力学性能、离子侵蚀深度与微观结构演变。结果表明:GFRP筋的劣化过程分为两个阶段,即初期树脂开裂膨胀和后期纤维刻蚀;高温环境下腐蚀离子对GFRP筋性能影响显著,其中OH^-浓度影响最大(pH=13.4的NaOH溶液使GFRP筋拉伸强度下降43.4%),然后依次是Na⁺、Ca²⁺、K⁺(在pH=12.4下,NaOH、Ca(OH)₂、KOH溶液中的拉伸强度损失率分别为31.6%、29.2%、22.7%);高温蒸馏水也会引发GFRP筋的轻微腐蚀,主要源于树脂达到玻璃化转变温度后产生的微裂纹。

关键词: FRP筋, 环氧树脂, 腐蚀离子, 高温环境, 力学性能, 微观结构

Abstract: To clarify the deterioration mechanism of resin and fibers in fiber-reinforced polymer (FRP)bars under the erosion of key ions in the pore solution of seawater and sea-sand concrete (SSC), this paper investigated the performance deterioration laws of glass fiber-reinforced polymer (GFRP) bars in water, NaCl solution, KOH solution, Ca(OH)₂ solution, NaOH solution, and simulated SSC pore solution. Through contact angle tests, tensile and shear strength tests, μ-XRF, and SEM analysis, the mechanical properties, ion erosion depth, and microstructure evolution of epoxy resin and GFRP bars in different corrosion environments were systematically explored. The results show that the deterioration process of GFRP bars can be divided into two stages: initial cracking and expansion of the resin and subsequent etching of the fibers. Corrosive ions have a significant impact on the performance of GFRP bars under high-temperature conditions, with OH^- concentration having the greatest effect (NaOH solution with a pH value of 13.4 reduces GFRP bars tensile strength by 43.4%), followed by Na⁺, Ca²⁺, and K⁺ (at pH=12.4, the tensile strength loss rates in NaOH, Ca(OH)₂, and KOH solutions are 31.6%, 29.2%, and 22.7%, respectively). High-temperature distilled water can also cause slight corrosion of GFRP bars, mainly due to the microcracks generated after the resin reaches the glass transition temperature.

Key words: FRP bar, epoxy resin, corrosive ion, high temperature environment, mechanical property, microstructure

中图分类号:

TU528

金祖权, 王宏, 逄博, 赵玲玲, 许明飞, 沈奥. 海水海砂混凝土孔溶液关键离子侵蚀下GFRP筋的性能演变[J]. 硅酸盐通报, 2025, 44(11): 3990-3999.

JIN Zuquan, WANG Hong, PANG Bo, ZHAO Lingling, XU Mingfei, SHEN Ao. Performance Degradation of GFRP Bars under Erosion of Key Ions in Pore Solution of Seawater and Sea-Sand Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 3990-3999.

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海水海砂混凝土孔溶液关键离子侵蚀下GFRP筋的性能演变

Performance Degradation of GFRP Bars under Erosion of Key Ions in Pore Solution of Seawater and Sea-Sand Concrete

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