考虑时变效应的砼内钢筋锈蚀速率预计模型  

Model for predicting steel corrosion rates of concrete rebar over time

作　　者：姬永生[1,2] 袁迎曙[2] 申建立[2] 来少平[2] 李琴[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第3期339-344,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(5053807050878207)

摘　　要：在钢筋锈蚀速率基本预计模型的基础上,建立考虑时变效应的钢筋锈蚀速率预计模型,通过试验确定了模型中参数阳阴极反应的Tafel斜率βa和βc随混凝土孔隙水饱和度θs及锈蚀时间t的变化规律,并通过人工加速气候环境试验对模型进行了验证.结果表明:当混凝土孔隙水饱和度小于95%时,人工气候环境下,模型计算值和试验实测值的经时变化规律相同,数值接近,误差不超过10%.Predicting the service life of a reinforced concrete structure requires a model for predicting steel reinforcement corrosion rates.A theoretical and quantitative analysis of the electrochemical corrosion process for steel rebar embedded within concrete is described.The time dependent corrosion rate was predicted by a model.Accelerated corrosion tests of rebar under an artificial environment were performed as a test of the model.The measured values agree with the prediction of the model when the pore saturation of the concrete is less than 95%.The difference between model estimates and observed corrosion rates is less than 10%.

关 键 词：钢筋锈蚀速率 时变效应 温湿度 预计模型 

分 类 号：TU375[建筑科学—结构工程]