A rapid numerical simulation method of chloride ingress in concrete material

At the recent decades, with the increase of research demand and the development of basic theory, the accuracy and the acceptability of the numerical simulation for the chloride ingress in concrete material has been gradually improved. However, the problem of low efficiency in the precise simulation is still serious, and one of the important reasons is that the traditional methods rely on the complete solution at all time nodes. The huge size of nearly repetitive result leads to the difficulty in the model solving and the data storing, which also restrict the promotion of numerical simulation in full structural section. In this paper, a rapid numerical simulation method is proposed, with the calculation of diffusion path caused by the aggregate particles and the solving of a small cement mortar model. The precise result of chloride ingress at all critical time nodes can be obtained from the conversion of the macroscale cement mortar model, based on the different length of diffusion path. By analyzing the result of numerical experiments, the proposed method can greatly improve the efficiency of model solving and reduce the amount of data storing. At the simulation of local chloride diffusion, the proposed method can avoid the ion accumulation phenomenon at the back-end effectively, which usually happened in the traditional models, and describe the concentration field of chloride ion more accurately.