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Shear strengthening of RC beams using NSM CFRP bonded using cement-based adhesive

机译：使用基于水泥基粘合剂粘合的NSM CFRP剪切强化RC光束

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摘要

The shear strength of existing Reinforced concrete (RC) members can be improved by bonding Carbon fibre reinforced polymers (CFRPs) as Near-surface mounted (NSM) or Externally bonded reinforcement (EBR). CFRPs are typically bonded to RC members using epoxy resins which have low glass transition temperatures resulting in poor fire performance. In an effort to improve the fire performance of CFRP strengthened members, researchers have developed Cement-based adhesives (CBAs) and verified their efficacy using NSM CFRP-to-concrete joint tests, however no applications have been conducted on full-scale RC beams strengthened in shear using NSM CFRP and CBA. This study attempts to fill this gap and involves testing fourteen RC beams strengthened in shear using NSM CFRP textile bonded using CBA. The experimental results showed that CFRP textile bonded using CBA in NSM configurations significantly improved the shear capacity of the RC members. Further, comparisons were made between CBA and epoxy resins as bonding agents and it was found that CBA achieved comparable results to epoxy when used in the configuration explored. The results of NSM-CFRP strengthened beams with CBA showed shear strength improvements of 97% and 70% using CFRP textile and laminate, respectively. Therefore, the use of CBA in the NSM CFRP strengthening techniques is considered a good substitute for epoxy resins for bonding CFRP to concrete members.
机译：通过粘合碳纤维增强聚合物（CFRP）作为近表面安装（NSM）或外部键合增强（EBR），可以通过粘合碳纤维增强聚合物（CFRP）来改善现有钢筋混凝土（RC）构件的剪切强度。 CFRPS通常使用具有低玻璃化转变温度的环氧树脂键合至RC构件​​，导致火灾性能差。为了提高CFRP加强成员的火灾性能，研究人员已经开发了基于水泥基粘合剂（CBA）并使用NSM CFRP-To - 混凝土关节试验验证了它们的功效，但是在全尺寸的RC光束上没有进行了应用的应用使用NSM CFRP和CBA剪切。该研究试图填补这种间隙，涉及使用使用CBA键合的NSM CFRP纺织品在剪切中测试14个RC光束。实验结果表明，使用CBA在NSM配置中粘合的CFRP纺织品显着提高了RC构件的剪切容量。此外，CBA和环氧树脂之间的比较是粘合剂，发现CBA在探索的配置中使用时对环氧树脂达到了类似的结果。 NSM-CFRP强化梁的结果分别使用CFRP纺织品和层压板显示出97％和70％的剪切强度提高。因此，在NSM CFRP强化技术中使用CBA被认为是用于将CFRP结合到混凝土构件的环氧树脂的良好替代品。

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