Investigation on bond performance of concrete strengthened with CFRP plates

In this paper, concrete specimens with type I prefabricated cracks were prepared, and three-point bending tests used to investigate the influence of parameters, such as carbon fiber reinforced polymer (CFRP) plate thickness, depth crack, strength, loading speed, on bonding performance structures externally attached CFRP plates. The CCD cameras observation system, digital speckle technology is analyze expansion characteristics crack. failure mode crack development specimen are numerically simulated by finite element software. results show that reinforcement plates can increase flexural stiffness concrete, significantly improve bearing capacity delay cracks; under same load, reduce propagation distance deformation displacement specimen. numerical simulation that, in pasting length plate, gradually increases, moves from middle both sides.