海工混凝土结构钢筋表面去钝化时间的预估方法

Prediction Method for the Time of Destroying Reinforcement Protective Film of Concrete Structure in Marine Environment

根据F ick第二扩散定律和有限差分原理,建立了综合考虑混凝土的氯离子结合能力、混凝土边界氯离子浓度的累积变化以及氯离子扩散系数在服役期变化的预测混凝土氯离子浓度分布的理论模型,从而可以根据混凝土临界氯离子浓度算出海工混凝土结构钢筋表面去钝化时间.

Based on Fick＇ s second law and theory of finite difference, the model of predicting the distribution of chloride in concrete is presented. The model takes account of chloride binding capacity of mottars, the variable of boundary chloride concentration, and the variable of chloride diffusion coefficient in its service period. The time of destroying reinforcement protective film of concrete structure can be calculated on the basis of critical chloride concentration.