Time-dependent corrosion crack reliability analysis considering on time-dependent chloride diffusion

Based on the Fick's Law and Faraday's Law, the chloride-induced corrosion velocity in synthetic concrete pore solution and the time-dependent chloride diffusion coefficient in concrete were experimented by using the four-electrode sensor system. Then the chloride-induced time-dependent corrosion velocity was raised, and the pitting corrosion crack reliability model was presented considering the elastic-fracture mechanics and pitting corrosion model. The experimental results show that the mean corrosion velocity linearly increases with chloride concentration and has the largest value with the increasing of time. The corrosion velocity with time-dependent chloride diffusion coefficient is smaller than the one with time-independent coefficient. The Monte Carlo analysis of pitting corrosion crack shows that the crack is initiated on the 10th to 15th year, and the crack width is decreasingly affected by the increase of the cover and the steel diameter and the surface chloride concentration's decreasing. The study results are referred to predict the chloride-induced corrosion crack and to evaluate the durability of reinforced concrete with pitting corrosion. ©, 2014, Hunan University. All right reserved.