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通过18个表层嵌贴CFRP-混凝土拔出试件的试验,考察了不同冻融循环次数下有着不同CFRP埋深的试件的粘结承载力、破坏模式以及CFRP的应变分布等,分析了不同冻融循环次数下嵌贴CFRP-混凝土界面的粘结行为;以及在冻融循环作用下,不同CFRP板条埋深对嵌贴CFRP粘结性能的影响。试验结果表明:随着冻融循环次数的增加,试件的破坏模式由CFRP板的拉断破坏转变为试件粘结界面的破坏,试件的粘结承载力呈下降趋势,冻融侵蚀对CFRP-混凝土界面粘结性能产生了明显的劣化作用;在室温环境下,CFRP埋置深度对CFRP-混凝土界面粘结性能影响不明显;在冻融循环作用下,CFRP板条埋置深度为10mm时,其CFRP-混凝土界面粘结性能受冻融循环侵蚀的劣化作用较其他试件更明显。
Through the test of embedding CFRP-concrete specimens from 18 surface layers, the bonding capacity, failure mode and strain distribution of CFRP specimens with different CFRP depths under different freeze-thaw cycles were investigated. The behavior of CFRP-concrete interfacial bonding under freeze-thaw cycles, and the effect of CFRP lath depth on the bonding properties of CFRP under the freeze-thaw cycles. The experimental results show that with the increase of the number of freeze-thaw cycles, the failure mode of the specimen changes from the rupture failure of the CFRP sheet to the failure of the bonded interface of the specimen, the bond capacity of the specimen decreases, CFRP-concrete interface has a significant deteriorating effect; at room temperature, CFRP embedding depth of CFRP-concrete interface bonding performance is not obvious; under the freeze-thaw cycle, CFRP slab embedding depth of 10mm , The CFRP-concrete interfacial adhesion was more obviously deteriorated by freeze-thaw cycles than other samples.