在基础设施康复中使用的CFRP条带的长期耐用性
Karunya Kanagavel1, Vistasp M Karbhari1,2
1Department of Civil Engineering, University of Texas Arlington, Arlington, TX 76019, USA.
Polymers
|July 12, 2025
概括
碳纤维增强聚合物 (CFRP) 复合材料长期浸泡在各种溶液中,显著降低了拉伸和剪切强度,需要在基础设施恢复方面制定新的安全因素. 耐久性预测模型是基于5年暴露数据开发的.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
背景情况:
- 碳纤维增强聚合物 (CFRP) 复合材料对于基础设施维修至关重要.
- 目前对CFRP的耐用性数据有限,这阻碍了长期性能预测.
研究的目的:
- 在各种环境条件下评估预制CFRP系统的5年耐用性.
- 评估水,海水和性溶液对CFRP机械性能的影响.
- 开发用于结构改造中长期CFRP性能的预测模型.
主要方法:
- 在脱离离子水,海水和性溶液中浸泡三种不同的CFRP系统5年.
- 在23°C,37.8°C和60°C的温度下进行测试.
- 定期拉力和短束剪切 (SBS) 测试以表征降解.
主要成果:
- 拉伸模量显示最小的降解 (7.3-11.9%).
- 拉力和SBS强度大大降低,特别是在高温和更长的浸泡时间下.
- 在脱离离子水中,SBS强度保留在60°C时低至38.4-48.7%.
- 性溶液表现出最高的恶化,而脱离离子水表现出最小的恶化.
结论:
- 碳纤维纤维的恶化,特别是在纤维-矩阵结合处,超过了当前的设计值.
- 增强的安全因素和接口级测试 (例如SBS) 对CFRP康复至关重要.
- 开发的方程允许使用寿命预测和修订的设计值,50年使用寿命的环境因子为0.56-0.69.
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