一般大气环境下钢筋开始锈蚀时间的计算方法  

Calculation method of the initial time of steel-bar corrosion under atmospheric environment

作　　者：董振平[1] 牛荻涛[1] 刘西芳[2] 王庆霖[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]陕西宝光集团有限公司,陕西宝鸡721006

出　　处：《西安建筑科技大学学报（自然科学版）》2006年第2期204-209,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50378079)

摘　　要：在评估混凝土结构耐久性时,其关键是确定钢筋开始锈蚀条件.一般大气环境下混凝土中钢筋开始锈蚀的条件是混凝土碳化及钢筋脱钝.碳化残量是描述钢筋开始锈蚀的重要参数,其大小取决于部分碳化区长度、碳化速度及脱钝速度.以实际工程检测数据为主要依据,考虑不同环境条件,以碳化系数、保护层厚度和局部环境系数为主要参数,利用回归分析方法建立了碳化残量的计算公式,并由此计算钢筋开始锈蚀的时间.通过实际工程数据验证,表明本文给出的钢筋开始锈蚀时间计算方法,在工程应用上是可行的,从而为合理评定混凝土结构耐久性提供依据.Establishing the initial time of steel-bar corrosion is the key to the durability assessment of reinforced concrete structure. For reinforced concrete structure exposing to atmosphere, concrete carbonation and steel-bar depassivation are the conditions of steel-bar corrosion. Carbonation remains to be an important parameter describing the initial time of steelbar corrosion and determined by length of incomplete carbonation zone, rate of carbonation and rate of depassivation. Based on spot-date, the calculation formula for carbonation remain is given in this paper, and is expressed by the major parameters including coefficient of concrete carbonation, cover depth and coefficient of local environment. By verifying the practical engineering, the method for calculating the initial corrosion time of steel bar is available for durability assessment of reinforced concrete structure.

关 键 词：混凝土耐久性 混凝土碳化 钢筋锈蚀 脱钝 碳化残量 

分 类 号：TU375[建筑科学—结构工程]