裂缝对混凝土内氯离子扩散和钢筋锈蚀的影响  

INFLUENCE OF CRACKS ON CHLORIDE DIFFUSION AND REINFORCEMENT CORROSION IN CONCRETE

作　　者：张邵峰[1] 陆春华[1] 陈妤[1] 刘荣桂[1] 崔钊玮[1] 

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《工程力学》2012年第A01期97-100,共4页Engineering Mechanics

基　　金：国家自然科学基金项目(50908103;50878098);江苏大学高级人才科研基金项目(11JDG132);江苏省博士研究生创新工程项目(CX10B_002X)

摘　　要：为了研究受力裂缝对混凝土内氯离子扩散的影响,对8根开裂(预制裂缝和受弯裂缝)的钢筋混凝土梁试件进行了盐溶液干湿循环试验;并采用半电池电位法和RCT(快速氯离子含量检测)法,分别对梁内钢筋的锈蚀状态以及各裂缝处氯离子含量进行了检测;最后采用ADINA有限元软件对开裂混凝土内氯离子的二维扩散行为进行模拟分析。试验和模拟结果表明:1)裂缝加速了氯离子的侵入,导致钢筋过早的开始锈蚀,且为局部氯离子的二维扩散提供了条件;2)裂缝宽度越大或间距越小,其对氯离子侵入引起的钢筋锈蚀影响程度越大;3)有限元模型的计算与试验结果吻合较好。To study the influence of load-induced cracks on chloride diffusion and reinforcement corrosion in reinforced concrete （RC）, eight RC beams with pre-cracks or flexural cracks were immersed in chloride solution with the condition of a dry-wet cycle. Then a half-cell potential method and a RCT （Rapid Chloride Test） were used to evaluate reinforcement corrosion and chloride concentration. Finally, the finite element analysis software ADINA was used to simulate the two-dimensional diffusion of chloride in cracked concrete. Results showed that： 1） Cracks accelerated the chloride penetration in concrete, which will lead to the premature corrosion of rebar and provided conditions for the local two-dimensional diffusion of chloride; 2） The wider the crack width or the smaller the spacing is, the greater effective it did to the chloride-induced corrosion of rebar; 3） Simulation results agree well with experimental results.

关 键 词：钢筋混凝土 裂缝 氯离子扩散 腐蚀电位 有限元 

分 类 号：TU528[建筑科学—建筑技术科学]