STUDY ON MODIFIED CHLORIDE LON MIGRATION MODEL IN CRACK CONCRETE

Through the study of chloride ion in cracked concrete, a coupling model is established, which considers diffusion, binding and electric potential and the crack influence. Predicting the concrete service life. The model was verified by experimental data. In Nantong saline soil, the chloride ion migration in different width and depth crack and the variation law of concrete service life was analyzed by Comol Multiphysics. The research shows that the chloride ion concentration decreases with the increase of intrusion depth, and increases over time. When moving into concrete, the chloride concentration dropping suddenly. The concrete service life increases with the increase of the protective cover thickness, and decreases with the increase of the crack depth, and the exponential function relation with the increase of the crack width.