海工混凝土的氯离子扩散性与寿命评估_吴庆令.pdf

12 6 　　　　　 Vol.12, No.6 2009 12 JOURNAL OF BUILDING M ATERIALS　 Dec., 2009 　　:1007-9629(2009)06-0711-05 1 1 1 1, 2 3 吴庆令 , 　余红发, 　梁丽敏 , 　王甲春 , 　刘连新 (1. , 210016;2. , 36102 ; 3. , 810016) :通过现场海洋曝露试验和实验室海水浸泡试验, 取分层取样和化学分析方法, 应用氯离子 三维扩散理论, 研究了普通混凝土和高性能混凝土在海洋大气区、潮汐区、水下区和实验室海水浸 - - 泡下的Cl 扩散系数变化规律.结果表明, 混凝土的Cl 扩散系数随着曝露时间的增加而降低,高 - 性能混凝土的抗Cl 扩散性优于普通混凝土.在 Khatri 计算模型的基础上,提出了考虑劣化效应 系数的海工混凝土使用寿命计算模型.该模型计算结果与Clear 经验模型基本吻合, 解决了Khatri 计算模型结果与实际寿命不相符的问题. - :海工混凝土;氯离子(Cl );扩散系数;使用寿命;模型 :TU528.0　　　:A Life Assessment and Chloride Ion Diffusivity of Marine Concrete 1 1 1 1,2 3 WU Qing-ling , 　YU Hong -f a , 　L IANGLi-min , 　WANGJ ia-chun , 　L IULian-x in (1.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2 .Department of Architecture Engineering, Xiamen University of Technology, Xiamen 36102 , China; 3.Department of Civil Engineering, Qinghai University, Xining 810016, China) Abstract:Through field exposure test in the ocean and sea-w ater immersion test in the laboratory, taking methods of stratified sampling and chemical analysis, permeability of chloride for ordinary Portland cement concrete(OPC)and high performance concrete(HPC)in marine atmospheric zone, tidal zone, submerged zone and laboratory seaw ater is examined on the basis of three-dimensional chloride diffusion theory .The results show that chloride diffusion coefficient (Dt )increases with the decrease of exposure time;the chlo- ride ion diffusivity of HPC is less than that o