  The erosion of chloride ions in concrete bridges will accelerate the
corrosion of reinforcement, which is an important reason for the decline of
bridge durability. The erosion process of chloride ion, especially deicing salt
solution in cold regions, is complex and has many influencing factors. It is
very important to use accurate and effective methods to analyze the chloride
ion erosion process in concrete. In this study, the pre-stressed concrete
bridge retired in the cold region was taken as the research object, and the
specimens from the whole bridge are obtained by the method of core drilling
sampling. The concentration of chloride ion was measured at different depths of
the specimens. The process of chloride ion erosion was simulated in
two-dimensional space through COMSOL multi-physical field simulation, and
compared with the measured results. The simulation method proposed in this
paper has good reliability and accuracy.
