Abstract:In order to study concrete crack expansion behavior under conditions of corrosion, combined with the theory of fracture mechanics, and crack detection by acoustic tester, the constitutive relation of correlation is established; with high-speed camera, observe the corrosion condition of concrete crack development process, analysis of the cracking pattern of the influence factors and development process; with the extended finite element software ABAQUS, numerical simulation is carried out to verify the effectiveness. The results show that it has a strong correlation between concrete internal micro crack expansion process and wave velocity. In the early, the velocity is constant for a long time, when exceeded the critical point, velocity decreases sharply until into a new steady state once again.