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Experimental Study on Effects of Resins on Bond Force Transfer of Carbon Fiber Sheet-Concrete Interface

机译：树脂对碳纤维板混凝土界面粘合力转移的实验研究

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This paper presented results of a series of single-lap shear bond tests to clarify the bond force transfer capacity of carbon fiber sheet (CFS)-concrete interface, in which resin was treated as a main experimental parameter. Influences of different epoxy resins' Young's Modulus (0.35～3GPa), and different adhesive layer thickness (0.5mm, 1.0mm, 2.0mm) were observed. CFS stiffness (1 to 3 layer CFS) was also changed to compare effects of resins in the cases of different FRP sheet/adhesive stiffness ratio. Based on the experimental results, influences of resins on tensile strength of CFS, force transfer capacity of CFS-concrete interface and failure types were discussed. It could be seen from the experiments that changing thickness of resins in adhesive layer from 1.0mm to 2.0mm will increase the interface force transfer capacity significantly especially in the case of CFS-concrete interface with 3 layers CFS. Applying moderately soft resins can improve the load transfer capacity of CFS-concrete interface as well. However, it must be noted that harmful decrease of CFS tensile strength will be brought out by using low-Young's modulus resin as CFS immersing matrix. As a result, during the sheet bonding construction period soft resin can be regarded as a choice of not immersing matrix but interface bond adhesive. Based on the analysis of experimental data, a sandwich bonding system was proposed to improve the bond effects of CFS-concrete interface.
机译：本文提出了一系列单圈剪切粘结试验的结果，以阐明碳纤维片（CFS） - 互联界面的键压力传递能力，其中树脂被处理为主要实验参数。观察不同环氧树脂杨氏模量（0.35〜3GPa）和不同粘合剂层厚度（0.5mm，1.0mm，2.0mm）的影响。 CFS刚度（1至3层CFS）也改变以比较树脂在不同FRP片材/粘合刚度比例中的影响。基于实验结果，讨论了树脂对CFS拉伸强度的影响，CFS - 混凝土界面和故障类型的力转移能力。从实验中可以看出，从1.0mm到2.0mm的粘合剂层中的树脂厚度改变树脂的厚度将显着增加界面力传递能力，特别是在CFS - 混凝土界面具有3层CFS的情况下。应用中等软树脂也可以提高CFS混凝土界面的负载传递能力。然而，必须注意的是，通过使用低杨氏模量树脂作为CFS浸入基质，将使CFS拉伸强度的有害降低。结果，在片材粘合结构期间，可以将软树脂视为不浸没基质但界面粘合剂的选择。基于对实验数据的分析，提出了一种夹层粘接系统，以改善CFS - 混凝土界面的键效应。

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