| 摘要: |
| 研究了在一般环境、氯化物环境、冻融-氯化物环境中，杂散电流对普通钢筋混凝土和添加适量活性掺合料的耐腐蚀钢筋混凝土腐蚀程度的影响。试验结果表明，在氯盐-杂散电流双重因素腐蚀条件下，氯化物环境加速杂散电流对建筑钢筋混凝土结构的腐蚀。与同水胶比普通混凝土相比，耐腐蚀混凝土内钢筋产生锈蚀的电流密度可提高5倍。耐腐蚀混凝土极大延缓氯盐环境中杂散电流腐蚀破坏时间，较同水胶比的普通混凝土延长15倍。杂散电流的存在加剧了混凝土在氯化物环境中的冻融破坏。 |
| 关键词: 杂散电流 钢筋混凝土 腐蚀 掺合料 耐腐蚀混凝土 |
| DOI： |
| 分类号:TU528 |
| 基金项目:中央级公益性科研院所基本科研业务费专项资金重点项目（Y410003） |
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| Influences of stray current on corrosion behaviors of reinforcing steel bar in concrete placed in different environments |
|
CHEN Xun-jie
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Research Center on New Materials in Hydraulic Structures, Ministry of Water Resources, Nanjing Hydraulic Research Institute
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| Abstract: |
| In this paper, the influences of the stray current on corrosion behaviors of the reinforcing steel bar in the ordinary concrete and anti-corrosion concrete with mineral admixtures placed in the common environment, chloride environment and freezing-thawing-chloride environments have been studied. Testing results show the stray current accelerates corrosion of the reinforcing steel bar in concrete placed in the chloride environment under coupling effects of the chloride and stray current. The current density induced corrosion of the reinforcing steel bar in the anti-corrosion concrete is 5 times the density of the normal concrete which has the same water-binder ratio as the anti-corrosion concrete. Corrosion of the stray current of the reinforcing steel bar in the anti-corrosion concrete can be remarkably retarded by 15 times than that in the normal concrete which has the same water-binder ratio as the anti-corrosion concrete in the chloride environment. Because of presence of the stray current, the freeze-thaw induced damage of concrete placed in the chloride environment is getting worse. |
| Key words: stray current reinforced concrete corrosive environment admixture anti-corrosion concrete. |
