南方海洋环境下氟碳/聚氨酯涂层防护GFRP筋拉伸性能

鲍玖文; 滕宴君; 曹银龙; 王文焕; 王燕茹; 张鹏

南方海洋环境下氟碳/聚氨酯涂层防护GFRP筋拉伸性能

青岛理工大学土木工程学院, 山东青岛, 266520

基金项目: 国家自然科学基金(U2106219，52378247)；山东省自然科学基金(ZR2021JQ17)；山东省高等学校青创科技计划创新团队(2021KJ019)；青岛市科技惠民示范专项(24-1-8-cspz-9-nsh)

详细信息

通讯作者:
张鹏，教授，博士生导师，主要研究方向为土木工程材料耐久性　E-mail: peng.zhang@qut.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2024-05-17
- 修回日期: 2024-07-14
- 录用日期: 2024-07-31
- 网络出版日期: 2024-08-08

Tensile performance of fluorocarbon/polyurethane-coated GFRP bars exposed to southern marine environment

School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China

Funds: National Natural Science Foundation of China (U2106219, 52378247); Natural Science Foundation of Shandong Province (ZR2021JQ17); Youth Innovation Team Development Plan of Shandong Province in China (2021KJ019); Demonstration Project of Benefiting People with Science and Technology of Qingdao, China (24-1-8-cspz-9-nsh)

摘要

摘要: 传统金属材料在海洋环境下存在锈蚀问题，而纤维增强聚合物(FRP)筋材具有轻质高强、抗疲劳、耐腐蚀等优势，利用FRP筋替代钢筋已成为提高海洋混凝土结构耐久性的一种有效选择，但长期处于高紫外线、高盐和高湿等环境中，其树脂基体较为脆弱，材料化学结构易产生变化，造成FRP复合材料性能失效，从而降低其刚度和耐久性，利用涂层进行防护可有效提高FRP的抗老化和耐腐蚀能力。基于此，考虑高辐射、高盐和高湿的南方海洋环境因素，研究了紫外线老化及不同腐蚀介质(去离子水和真实海水)作用氟碳和聚氨酯涂层防护玻璃纤维增强复合材料(GFRP)筋材拉伸性能的退化规律，分析了不同暴露龄期(0、7、14、30、60 d)下两种涂层体系防护GFRP筋材的拉伸性能影响规律，并通过扫描电子显微镜(SEM)表征了腐蚀前后涂层的微观形貌及性能退化规律。结果表明：紫外线老化7 d后因涂层发生残余交联使GFRP筋拉伸强度提高了3%~5%，而之后涂层化学结构破坏与分子链断裂，紫外线老化60 d后其拉伸强度保留率为85%~90%；在去离子水和海水中浸泡60 d后，抗拉强度保留率范围分别为92%~95%、91%~93%；与聚氨酯涂层相比，氟碳涂层的耐久性相对优异，在相同劣化条件下具有更高的拉伸强度保留率，这是由于氟碳涂层具有优越的F-C键结构，氟原子紧密排列在聚合物碳链的周围起到了良好的保护作用，赋予含氟聚合物优异的耐久性。
- GFRP筋 /
- 氟碳/聚氨酯涂层 /
- 拉伸性能 /
- 紫外线老化 /
- 腐蚀劣化
Abstract: Traditional metal materials have serous corrosion problems when exposed to marine environment, while fiber reinforced Composite (FRP) bars have the advantages of light weight, high strength, fatigue resistance, and corrosion resistance, etc. The application of FRP bars to replace steel bars has become an effective choice to improve the durability of marine concrete structures. However, for the long-term exposure to high ultraviolet (UV), high salt, high humidity and other environments, the resin matrix of FRP is relatively fragile, and the chemical structure of materials is prone to be changed, resulting in the performance failure of FRP composite materials to cause the decline of the stiffness and durability. The application of coating protection can effectively improve the resistance to aging and corrosion of FRP materials. Based on this, considering high radiation, high salinity, and high humidity southern marine environmental factors, the degradation law for the tensile performance of glass fiber reinforced Composite (GFRP) bars protected by fluorocarbon and polyurethane coatings under the action of ultraviolet radiation and different corrosive media (deionized water and real seawater) was studied. And the effect of different exposure ages (0, 7, 14, 30, and 60 d) on the tensile performance of GFRP bars coated by two systems was analyzed. The microstructure and performance degradation law of the coatings before and after corrosion were characterized by scanning electron microscopy (SEM). The results showed that after 7-days UV aging, the residual crosslinking actions of coatings increased the tensile strength of GFRP bars by 3% to 5%. After then, the chemical structures of the coatings were destroyed and molecular chains were broken. After 60-days UV aging, the retention rate of GFRP tensile strength was 85% to 90%. After soaking in deionized water and seawater for the duration of 60 days, the retention rates of tensile strength ranged from 92% to 95% and 91% to 93%, respectively. Compared to polyurethane coatings, fluorocarbon coatings have relatively excellent durability and higher retention of tensile strength under the same degradation conditions. This is due to the superior F-C bonding structure of fluorocarbon coatings, where fluorine atoms are tightly arranged around the polymer carbon chain, providing the good protection and endowing fluoropolymers with excellent durability.
- GFRP bar /
- Fluorocarbon/Polyurethane coating /
- Tensile performance /
- UV aging /
- Corrosion deterioration

HTML全文

图 1 GFRP筋材涂覆前后的局部外观形貌

Figure 1. Local appearance of GFRP bars before and after coating

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图 2 GFRP筋材的紫外线老化试验

Figure 2. Ultraviolet radiation test of GFRP bars

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图 3 GFRP套筒试件及拉伸试验装置

Figure 3. GFRP sleeve specimens and the tensile testing device

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图 4 未涂覆涂层GFRP筋紫外线老化7 d前后的应力-应变曲线

Figure 4. Stress-strain curves of GFRP before and after 7 days of UV aging

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图 5 不同紫外线老化龄期下FC/PU涂层防护GFRP的应力-应变曲线

Figure 5. Stress-strain curves of FC/PU-coated protective GFRP under different UV aging ages

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图 6 不同紫外线老化龄期下FC/PU涂层防护GFRP的抗拉强度

Figure 6. Tensile strength of FC/PU coated protective GFRP under different UV aging ages

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图 7 不同紫外线老化龄期下GFRP弹性模量与断裂伸长率

Figure 7. Elastic modulus and breaking elongation of GFRP under different UV aging ages

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图 8 FC/PU涂层防护GFRP筋劣化机制

Figure 8. Degradation mechanism of FC/PU coating protected GFRP bar

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图 9 去离子水及海水环境下FC/PU涂层防护GFRP筋材应力-应变曲线

Figure 9. Stress strain curves of FC/PU-coated protective GFRP in DW and SW environments

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图 10 不同腐蚀浸泡龄期下FC/PU涂层防护GFRP筋材拉伸性能

Figure 10. Tensile properties of FC/PU-coated protective GFRP bars at different ages of corrosion immersion

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图 11 不同腐蚀浸泡龄期下FC/PU涂层防护GFRP筋弹性模量与断裂伸长率

Figure 11. Elastic modulus and breaking elongation of FC/PU-coated protective GFRP bars at different ages of corrosion immersion

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图 12 FC/PU涂层劣化前后SEM

Figure 12. SEM images of FC/PU coatings before and after degradation

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图 13 FC/PU涂层表面颗粒物XRD图谱

Figure 13. XRD of surface particulate of FC/PU coating

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表 1 实测玻璃纤维增强复合材料(GFRP)筋材基本性能指标

Table 1. Measured basic performance index of glass fiber reinforced Composite (GFRP) bars

Performance index GFRP bars

Tensile strength/MPa 714.30

Elasticity modulus/GPa 50.08

Breaking elongation/% 1.48

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