冷却方式对高温暴露后CFRP混凝土粘结性能的影响：实验研究
Effect of Cooling Methods on CFRP-Concrete Bond Behavior After High-Temperature Exposure: An Experimental Study.
摘要(中文译文)
混凝土结构极易受到火灾影响，火灾会加速其力学性能退化，并可能导致部分或整体结构失效。外贴碳纤维增强聚合物（CFRP）系统广泛用于火灾后加固；然而，CFRP与受火损伤混凝土之间界面的粘结行为，尤其是在不同冷却条件下的粘结行为，尚未被充分理解。本研究通过试验和理论方法对粘结行为进行了研究。共进行了三十九个试件的双搭接接头试验，包括三个未受热对照试件和三十六个分别暴露于200 °C、400 °C和600 °C温度下持续一小时和两小时的试件。在粘贴CFRP之前，采用了自然空气冷却和水冷却两种冷却方式。结果表明，在不超过400 °C的暴露条件下，粘结强度有所提高，而在600 °C时则观察到显著降低。与空气冷却相比，水冷却导致更低的粘结强度，而较长的暴露时间在某些热条件下改善了粘结性能。对上述现象背后的原因进行了详细分析。基于试验结果，建立了用于预测受火损伤混凝土与CFRP片材之间界面粘结强度的分析模型。该模型能够考虑峰值温度、暴露时间和冷却方式的影响，并表现出较高的预测精度（R = 0.94）。研究结果为火灾后CFRP-混凝土相互作用提供了有价值的见解，并为受火损伤混凝土结构的评估和修复提供了实践指导。
Abstract
Concrete structures are highly vulnerable to fire exposure, which accelerates the degradation of mechanical properties and may lead to partial or total structural failure. Externally bonded carbon fiber-reinforced polymer (CFRP) systems are widely used for post-fire strengthening; however, the bond behavior at the interfaces between CFRP and fire-damaged concrete, particularly under different cooling conditions, is not yet fully understood. In this study, the bond behavior was investigated experimentally and theoretically. Double-lap joint tests of thirty-nine specimens were conducted, including three unheated control specimens and thirty-six specimens exposed to temperatures of 200 °C, 400 °C, and 600 °C for durations of one and two hours. Two cooling methods, natural air cooling and water cooling, were applied prior to CFRP bonding. The results indicated that bond strength increased under exposure conditions of no more than 400 °C, whereas a significant reduction was observed at 600 °C. Water cooling resulted in lower bond strength compared with air cooling, while longer exposure durations improved bond performance under certain thermal conditions. The reasons behind the phenomena were analyzed in detail. Based on the experimental results, an analytical model for predicting the bond strength at the interfaces between fire-damaged concrete and CFRP sheets was developed. The model can account for the effects of peak temperatures, exposure durations, and cooling methods, and demonstrated high predictive accuracy (R = 0.94). The findings provide valuable insight into CFRP-concrete interaction after fire exposure and offer practical guidance for the assessment and rehabilitation of fire-damaged concrete structures.
如何引用
AMA
Bu Wang, Abdulmalik Al-Barawi, Zhenxun Dai, Kehang Liu, Mostafa M A Mostafa, Mu Ma. Effect of Cooling Methods on CFRP-Concrete Bond Behavior After High-Temperature Exposure: An Experimental Study.. Polymers. 2026; doi:10.3390/polym18080939.
APA
Bu Wang, Abdulmalik Al-Barawi, Zhenxun Dai, Kehang Liu, Mostafa M A Mostafa, Mu Ma (2026). Effect of Cooling Methods on CFRP-Concrete Bond Behavior After High-Temperature Exposure: An Experimental Study.. Polymers. https://doi.org/10.3390/polym18080939
GB/T 7714
Bu Wang, Abdulmalik Al-Barawi, Zhenxun Dai, Kehang Liu, Mostafa M A Mostafa, Mu Ma. Effect of Cooling Methods on CFRP-Concrete Bond Behavior After High-Temperature Exposure: An Experimental Study.[J]. Polymers, 2026 doi:10.3390/polym18080939.
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