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首页> 外文期刊>Journal of Composites for Construction >Evaluating the Long-Term Durability of Externally Bonded FRP via Field Assessments
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Evaluating the Long-Term Durability of Externally Bonded FRP via Field Assessments

机译：通过现场评估评估外部粘合FRP的长期耐用性

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摘要

Fiber-reinforced polymer composites (FRP) are an attractive repair option for reinforced concrete structures, but whereas laboratory durability tests have indicated that FRP generally performs well in many environments, their long-term performance in field environments is not well understood. This case study describes an effort to collect in situ data about the FRP used to repair a concrete arch bridge 8 years after the FRP was originally placed. On-site assessment efforts included inspection for voids between the concrete and FRP using acoustic sounding and thermographic imaging and pull-off tests to check the bond strength. Large debonded regions of FRP were also cut from the structure and tested in tension in the laboratory. Results generally pointed to some level deterioration. Many new voids were found, existing voids had grown, pull-off testing showed weaker bond strengths, and the tensile strengths were quite low compared to design values. However, a lack of initial data make it difficult to distinguish between deterioration over time and the possibility of lower strengths because of field manufacture techniques.
机译：纤维增强聚合物复合材料（FRP）是钢筋混凝土结构的一种有吸引力的修补方法，但是尽管实验室耐久性测试表明FRP通常在许多环境中表现良好，但它们在野外环境中的长期性能还不太清楚。此案例研究描述了在最初放置FRP 8年后，要收集有关用于修复混凝土拱桥的FRP的现场数据的工作。现场评估工作包括使用声音探测和热成像成像检查混凝土与FRP之间的空隙，并通过拉拔测试来检查粘结强度。还从结构上切下了较大的FRP脱胶区域，并在实验室中进行了拉伸测试。结果通常表明一定程度的恶化。与设计值相比，发现了许多新的空隙，现有的空隙已经长大，拉拔试验表明其粘结强度较弱，抗拉强度很低。然而，由于现场制造技术的缺乏，缺乏初始数据使得难以区分随时间的劣化和强度降低的可能性。

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