氯离子对钢筋混凝土结构的侵蚀分析

氯离子侵蚀引起钢筋锈蚀破坏十分突出,是造成钢筋混凝土结构过早破坏的主要原因之一.分析氯离子进入混凝土中的途径、存在形式和氯离子在混凝土中的扩散模式,考虑温度变化、时间变化、湿度变化以及混凝土内部缺陷特征不同对扩散系数的影响,基于Fick第二扩散定律建立了氯离子在混凝土中的扩散模型,并分析了氯离子表面浓度、氯离子临界浓度和有效氯离子扩散系数的影响因素和确定方法,由此建立的模型可供寿命预测参考使用.

Analysis of chloride ion diffusion in reinforced concrete structures

Reinforcement corrosion is one of the dominant cause of reinforced concrete structures deterioration induced by chloride ion penetration.The primary channels,source and existing forms of chloride ion penetrating into concrete is discussed.The chloride diffusion coefficient is coupled with many variables such as temperature variety,time of exposure,moisture content and the concrete internal condition.According to the Fick's second law,the chloride diffusion model accounts for the effects of all of the parameters in concrete is built up.The chloride surface concentration,threshold concentration and the effective chloride diffusion coefficient is analyzed,and the model that build up from here can be provided as the life span estimate reference usage.