混凝土在多重因素作用下的氯离子扩散方程_余红发.pdfVIP

5 3 　　　　　 Vol.5, No.3 2002 9 JOURNAL OF BUILDING MATERIALS　 Sep., 2002 　　:1007-9629(2002)03-0240-08 1, 2 1 3 2 余红发 , 　孙　伟 , 　麻海燕, 　鄢良慧 (1. , 210096; 2. , 110015; 3. , 210096) :基于Fick 第二扩散定律, 推导出综合考虑混凝土的氯 子结合能力、氯 子扩散 系数的时间依赖性和混凝土结构微缺陷影响的新扩散方程, 得到了混凝土的氯 子扩散 理论基准模型, 建立了考虑多种耐久性因素作用下的混凝土表面剥落氯 子扩散理论模 型、混凝土冻融循环氯 子扩散理论模型和混凝土损伤氯 子扩散理论模型.借助于大量 的实验和工程数据, 对理论基准模型进行了实验验证和工程验证.结果表明, 在海洋、除冰 盐和盐湖等氯 子环境中, 混凝土氯 子浓度实测值与本文理论模型预测值完全相符, 取 得了满意的验证效果. :混凝土;氯 子扩散系数;模型;表面剥落;损伤;验证 :TU528　　　:A Diffusion Equations of Chloride Ion in Concrete under the Combined Action of Durability Factors 1, 2 1 3 2 Y U Hong-f a , 　S UN Wei , 　MA Hai-yan , 　YAN Liang-hui (1.Department of Materials Science an Engineering, Southeast University, Nanjing 210096, China;2.Department of Materials Science an Engineering, Shenyang Architecture an Civil Engineering Institute, Shenyang 110015, China; 3.College of Civil Engineering, Southeast University, Nanjing 210096, China) Abstract:Base on Ficks secon law of iffusion, a new multi-components iffusion equation was e- uce an a theoretical mo el of chlori e ion in concrete was obtaine .In this equation, the influences of chlori e ion bin ing capacity of concrete, time-epen ence of chlori e iffusivity an micro-efect of concrete structures w ere taken into consi eration.Chlori e iffusion mo els, inclu ing surface scaling chlori e iffusion mo el, freezing-thaw ing cycle chlori e iffusion mo el an amage chlori e iffusion mo el, w ere establishe .The theoretical mo els were verifie on basis of a vast amount of ata from long-term fiel an laboratory stu y that