盐渍土地区钢筋混凝土结构寿命预测模型
Life Prediction Model of Reinforced Concrete Structure in Saline Soil Area

为了建立盐渍土地区钢筋混凝土结构的寿命预测模型，将在盐渍土地区埋置混凝土试验桩并于3年后对试验桩表面氯离子浓度及钢筋锈蚀程度进行测试，通过建立氯离子渗透模型以预测钢筋锈蚀所需时间，并基于该渗透模型及混凝土构件状态预测钢筋锈蚀阶段及混凝土裂缝发展阶段所需时间。结果表明，混凝土水灰比、外掺料及外界环境会对氯离子扩散系数造成显著影响，从而影响钢筋锈蚀临界时间；混凝土保护层厚度及水灰比也会影响构件开裂时间及裂缝的发展速度。
In order to establish the life prediction model of reinforced concrete structures in the saline soil area, we will bury concrete test piles in the saline soil area and test the chloride ion concentration on the surface of test piles and the corrosion degree of steel bars three years later. The chloride ion penetration model is established to predict the corrosion time of steel bars. Based on the seepage model and the state of concrete members, the time required for the corrosion stage of reinforcement and the development stage of concrete cracks are predicted. The results show that the water-cement ratio of concrete, the external admixture and the external environment have a significant influence on the chloride ion diffusion coefficient, thus affecting the critical time of steel corrosion. The thickness of concrete protective layer and water cement ratio also affect the cracking time and crack development speed.