Method and system for predicting time-varying erosion of chloride ions in concrete in marine exposure environment

The invention provides a method and a system for predicting time-varying erosion of chloride ions in concrete in a marine exposed environment. The method comprises the following steps: acquiring parameters required by a concrete prediction model; determining an appropriate time-varying diffusion coefficient model according to exposure working conditions and the parameters to obtain a reference diffusion coefficient and an aging factor; determining an appropriate time-varying boundary condition accumulation model according to the accumulativity of the chloride ion adsorption capacity of the concrete surface along with the exposure time under the exposure working condition, and obtaining the initial surface chloride ion concentration and an empirical coefficient; and solving the chloride ion transmission model in the concrete, and realizing chloride ion concentration prediction under the specified exposure environment and exposure time. The system is used for realizing the prediction method. The method can accu