盐冻对钢筋混凝土杂散电流腐蚀的影响研究  

Effect of Salt-Freezing on Stray Current Corrosion of Reinforced Concrete

作　　者：庄华夏 蔡跃波[2] 陈迅捷[2] 韦华[2] ZHUANG Hua-xia;CAI Yue-bo;CHEN Xun-jie;WEI Hua(Wuhu Institute of Techonolgy,Wuhu 241003,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]芜湖职业技术学院,安徽芜湖241003 [2]南京水利科学研究院,江苏南京210029

出　　处：《混凝土与水泥制品》2023年第5期12-16,共5页China Concrete and Cement Products

基　　金：国家重点研发计划项目(2018YFC0406702);安徽省教育厅高校自然科学研究项目(KJ2021A1337)。

摘　　要：设计了盐冻时混凝土杂散电流腐蚀试验和盐冻后混凝土电阻率测试试验,通过测试杂散电流密度和混凝土电阻率研究了盐冻时混凝土杂散电流的腐蚀规律及盐冻后混凝土电阻率的变化规律,揭示了盐冻对混凝土杂散电流腐蚀的影响。结果表明:盐冻时,杂散电流密度与温度正相关,冷冻过程的混凝土杂散电流腐蚀比融化过程严重,而连续冻融循环将减小混凝土杂散电流腐蚀;盐冻后,混凝土的电阻率显著降低,并随冻融循环次数的增加呈指数衰减趋势,氯盐加速了混凝土电阻率的降低;氯盐浓度越大,钢筋杂散电流腐蚀越严重。The stray current corrosion test of concrete during salt-freezing and the concrete resistivity test after salt-freezing were designed.The stray current density and concrete resistivity were measured to explore the rule of stray current corrosion during salt-freezing and the change rule of concrete resistivity after salt-freezing.The effects of salt-freezing on stray current corrosion of concrete were revealed.The results show that the stray current density is positively correlated with temperature during salt-freezing,the stray current corrosion of concrete is more serious in freezing process than that in thawing process,and the continuous freeze-thaw cycle will reduce the stray current corrosion of concrete.After salt-freezing,the concrete resistivity decreases significantly and decreases exponentially with the number of freeze-thaw cycles.Chlorine salt accelerates the reduction of concrete resistivity.The higher the concentration of chlorine salt,the greater the stray current corrosion of reinforcement.

关 键 词：混凝土 杂散电流 盐冻 冻融循环 电阻率 腐蚀 

分 类 号：TU528.01[建筑科学—建筑技术科学]