Experimental Investigation On Bond Characteristics Between Nsm CFRP And Concrete

Near-surface mounted (NSM) in fiber-reinforced composites (FRP) reinforcement is themost promising technology, strengthening of reinforced concrete (RC) structure. Compared toexternally bonded reinforcement (EBR), the NSM system has a number of advantages: NSMreinforcement is less prone to debonding from the concrete substrate, increasing the strengthand stiffness of the reinforcements and fire resistance and other unique advantages. Theinternational engineering community has become increasingly aware of the practicaladvantages of this method, which has led to accelerations of research and practicalapplications worldwide.The digital image correlation method (DICM) is a new method of non-contact opticalmeasurement. Due to its advantages of non-contact feature, high precision and simplicity ofthe device, it makes up for the deficiencies of the commun measurement methods in the civilengineering. DICM was found valuable and applicable technique for experimentalinvestigation.This paper focuses on the near-surface mounted FRP-concrete interface characteristics.Firstly,17CFRP embedded reinforcement of concrete specimens with single shear test, bondlength, concrete strength and groove position is studied on the influence of interfaceproperties. Secondly, the application of Vic-2D software (based on digital image correlationmethod of the calculation and analysis software) calculate out the relative displacement andthe relative strain, and study interfacial debonding failure of law and interface properties.Finally, the results show that bond length and the distance from groove to the edge of prismhave larger influences on interface features, but impact on the interfacial properties ofconcrete strength is not obvious. Compared to BPE model and modified bilinear model,De.Lorenzis model more suitable for near-surface mounted thin CFRP plate bond-sliprelationship.