地铁迷流对混凝土中钢筋的腐蚀及混凝土强度影响的试验研究  

Experimental Study on Metro Stray Current Corrosion of Rebars in Reinforced Concrete and the Influence of Corrosion on Concrete Strength

作　　者：蔺安林[1] 周晓军[1] 

机构地区：[1]西南交通大学土木工程学院

出　　处：《世界隧道》1999年第6期1-8,共8页

摘　　要：根据地铁迷流对地下埋设的金属管线发生电化学腐蚀的机理,试验研究了钢筋混凝土试件在土壤介质中受不同外加直流电时的腐蚀状况,同时测定了钢筋发生腐蚀的电化学当量和腐蚀速率。通过试验得出钢筋在自然腐蚀状态下的电化学当量不适用于计算地铁迷流在混凝土中对钢筋产生的腐蚀量,同时得出迷流腐蚀导致混凝土结构的破坏是影响钢筋混凝土结构强度和耐久性的主要因素。By means of the mechanism of electrochemical corrosion of anodic oxidization of rebars in reinforced concrete main structure and metallic pipelines buried underground in metro, this paper deals with the simulation of soil corrosive media, in which reinforced concrete specimen is positioned, and executes the corrosion of rebars in concrete specimen under different external electric potential, simultaneously tests the electrochemical equivalent and corrosion rate of rebars in concrete specimen which is positioned in the media. Through analyzing the measured data, it can be inferred that electrochemical equivalent and corrosion rate of metals are influenced by the corrosive environmental media, and the electrochemical equivalent of natural corrosion for metals can not be used to calculate the magnitude of metal corrosion induced by metro stray current. According to the experimental results, it can be pointed out that the failure of reinforced concrete induced by metro stray current corrosion of rebars is the main factor that affects the strength and durability of reinforced concrete structures nearby the region in which metro stray current flows.

关 键 词：地铁迷流 钢筋混凝土 电化学腐蚀 地下铁路 

分 类 号：U223.62[交通运输工程—道路与铁道工程]