基于全浸泡外加电流法的锈蚀钢筋力学性能试验  

Mechanical Properties Test of Corroded Reinforcement Bar with All Soaking and Impressed Current Method

作　　者：张延年[1] 卢珍[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第6期1054-1058,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078065);辽宁省高等学校杰出青年学者成长计划项目(LJQ2011061);辽宁省教育厅科研项目(LS2010135);省级重点实验室开放基金项目(JG-200911)

摘　　要：目的研究钢筋锈蚀后的力学性能退化规律,为易锈蚀环境下钢筋类型和直径的选取提供参考依据.方法采用全浸泡外加电流法对不同钢筋直径、不同种类钢筋进行加速锈蚀处理,并利用液压万能试验机对锈蚀后钢筋进行拉伸试验,对比分析了锈蚀后钢筋的屈服强度、极限强度、质量损失率的变化规律.结果在相同的锈蚀条件下,不同类型钢筋耐腐蚀性不同,钢筋强度在锈蚀前后也存在着很大的差异.同时,表面积较大的钢筋锈蚀率较为严重,但截面积较小的钢筋名义屈服强度与极限屈服强度下降较快,且小直径钢筋的名义屈服强度退化情况较为严重.强度大的钢筋名义力学性能的退化情况较钢筋强度低得严重.结论全浸泡外加电流法可以在较短的时间内较好地反映锈蚀引起的结构性能劣化,该方法更适用于模拟自然情况下极限状态为开裂前的试件.In order to research mechanics performance degradation of rusty reinforcement bar,accelerate corrosion treatment of the different reinforced type and the different reinforced diameter are conducted with all soaking and impressed current method.Corroded reinforced bars are designed to carry out tension test with hydraulic universal testing machine.The comparative analysis of yield strength,ultimate strength and mass loss rate of rusty reinforcement bar is carried out.The results show that the corrosion resistance of the different reinforced type is different in the same corrosion condition,and the reinforced strength also exist great differences after corrosion.The corrosion rate of rusty reinforcement bar with larger surface area is relatively serious,but the steel nominal yield strength and ultimate strength of those with small sectional area decreased more rapidly.The nominal mechanical performance of corroded reinforced bars degrades more seriously.The external current soaking method to the performance of degradation of the structure is caused by corrosion in a short time and it is more suitable for simulating limit state before the specimens for cracking under natural conditions.

关 键 词：钢筋锈蚀 全浸泡外加电流法 力学性能 屈服强度 极限强度 质量损失率 

分 类 号：TU375[建筑科学—结构工程]