杂散电流对广州地铁混凝土溶蚀性能影响的加速试验研究  

Effect of stray current on the dissoluble corrosion of Guangzhou metro engineering concrete by accelerated test

作　　者：黄文新[1] 殷素红[2] 李铁锋[2] 文梓芸[2] 王果[2] 

机构地区：[1]广州市地下铁道总公司建设事业总部,广东广州510380 [2]华南理工大学材料科学与工程学院

出　　处：《混凝土》2008年第8期17-20,33,共5页Concrete

基　　金：广州市建设科技发展基金项目(200604);广州市地下铁道总公司科研项目(2005TJ07)

摘　　要：通过加速试验方法研究了直流电流作用下混凝土筛余砂浆的溶蚀性能,并建立了其与广州地铁工程混凝土在杂散电流下的溶蚀性能之间的关系。结果表明:当地铁杂散电流为100 mA/m2时,广州地铁工程混凝土抗杂散电流作用下溶蚀能力可以满足100年的安全运行。采用SEM和EDS对电流加速溶蚀试验后的砂浆进行分析,越靠近阴极部位的砂浆,其凝胶产物越松散,水化硅酸钙产物的Ca/Si越为下降;砂浆微观结构越不密实,孔隙越多。溶蚀后的砂浆强度比基准砂浆降低了约10%。The dissoluble corrosion of Guangzhou metro engineering concrete in direct current was studied by an accelerated DC dissolving test of the residue mortar and correlating it with concrete.The results show that the dissolvability resistance of Guangzhou metro engineering concrete can satisfy safely with 100 years usage when the stray current is in the level of 100 mA/m^2.SEM and EDS analysis show that,in the mortar,the closer to cathode,the smaller Ca/Si ratio of C-S-H is,and the more incompact of the microstructure is.The compressive strength of mortar in current declines about ten percent than that of reference mortar.

关 键 词：地铁工程混凝土 杂散电流 溶蚀 加速试验 耐久寿命 

分 类 号：TU528.01[建筑科学—建筑技术科学]