Abstract: Concrete cracks lead to deterioration of reinforced concrete structure durability due to steel bar corrosion caused by carbonated concrete. This paper analyzes the feasibility of simulations on concrete carbonation by the principle of heat conduction and develops a numerical model of concrete cracking caused by uniform corrosion of reinforcement in the frame of the finite element ANSYS packages. Corrosion expansion force of concrete cracking caused by corroded steel bars has been simulated using a heat-structure coupling model that applies a field of concrete carbonation. The simulations were verified by using our fast test data of carbonation periods 3d, 7d, 14d and 28d; and it shows that the simulated carbonation depths agree well with the measurements. Simulation results reveal that with carbonation time increasing, carbonation depth increases but carbonation rate becomes smaller. Corrosion expansion force is decreased by concrete carbonation, and it approaches a linearly decreasing trend as carbonation depth increases with time. We established a linear regression equation between corrosion expansion force and carbonation depth and obtained a good correlation.