工业厂房柱钢筋锈胀破坏模式及半电池法现场检测分析  

DAMAGE PATTERN OF COLUMNS WITH CORRODED STEEL BARS IN THE COMPRESSIVE ZONE OF CONCRETE SECTION AND THE DIFFICULT IDENTIFICATION OF CORROSION WITH HALF-CELL TECHNIQUE

作　　者：易伟建[1] 赵新[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《工业建筑》2005年第12期23-26,90,共5页Industrial Construction

摘　　要：介绍了在室内干燥环境中,某工业厂房排架结构柱的钢筋锈蚀现场调查结果;对半电池方法在实际混凝土工程结构中的应用展开了讨论;指出美国ASTM标准以电极电位为基本评价体系的局限性。采用有限元方法模拟服役构件的真实应力状态,分析得到钢筋混凝土偏心受压柱的受压区钢筋锈蚀后,在锈蚀产物体积膨胀和轴向压应力的联合作用下,构件受压区钢筋周围混凝土中平均拉应力的分布情况。提出在多维应力作用下,混凝土表面锈胀裂缝的开展形式与单纯锈胀力作用时基本一致,但是压应力的存在会明显加速表层混凝土锈胀裂缝的开展,而且一旦开裂,表层混凝土的层状剥落和边角剥落会发展得更快。It is presented an investigation of many reinforced concrete columns in four large workshops, since most of the columns are badly corroded. And a discussion of the usage of half-cell technique is carried out to get a fast appraisal of the corrosion state in the concrete structure, and is pointed out the limitation of the identification standard： ASTM C876. Based on the results of this investigation of corrosion damage and finite element method, it is also analyzed this kind of effect when the corrosion of the steel bars occurs in the compressive zone of concrete section of the reinforced concrete column. Even though there are the expanded action of corrosion products,it is clear that the location of stress peak point in the concrete, surrounding the corrosion bar is almost the same. But the compression stress could accelerate the development of corrosion crack obviously,which would speed up the failure of concrete cover. Moreover, comer spalling, and splitting spalling are two more potential models of the concrete cover failure.

关 键 词：钢筋腐蚀 钢筋混凝土柱 破坏模式 电化学检测 半电池法 

分 类 号：TU511.3[建筑科学—建筑技术科学]