高温条件下混凝土模拟孔隙溶液中钢筋腐蚀临界氯离子浓度的试验研究

周剑婷; 宋晓冰

doi:10.13204/j.gyjz201105003

高温条件下混凝土模拟孔隙溶液中钢筋腐蚀临界氯离子浓度的试验研究

doi: 10.13204/j.gyjz201105003

1.
上海交通大学土木工程系,上海200240

基金项目:

国家自然科学基金项目(50678101)

详细信息

作者简介:
第一作者：周剑婷, 女, 1984年出生, 硕士研究生。E-mail：zhoujianting@sjtu.edu.cn

中图分类号: TU375
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- 文章访问数: 82
- HTML全文浏览量: 8
- PDF下载量: 56
- 被引次数: 0
出版历程
- 收稿日期: 2009-11-23
- 刊出日期: 2011-05-20

EXPERIMENTAL RESEARCH ON CHLORIDE THRESHOLD LEVEL OF STEEL CORROSION IN SYNTHETIC PORE SOLUTION UNDER HIGH TEMPERATURE

1.
Department of Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China

摘要

摘要: 当钢筋周围混凝土孔隙液的游离Cl-超过临界氯离子浓度(cCl-)时，混凝土结构内的钢筋就会易于腐蚀。所以cCl-是暴露于氯离子环境的混凝土结构寿命预测的一个重要指标。特别在高温地区，钢筋混凝土结构破坏更严重。通过研究高温条件对钢筋腐蚀cCl-的影响。试验在50℃模拟孔隙溶液中进行，采用恒电位方法，考虑不同pH值的影响，得到具有95%保证率的临界氯离子浓度值。试验研究发现，在50℃溶液中钢筋腐蚀临界氯离子浓度比常温(25℃)下得到的结果小得多，而且温度的影响作用随着控制电位的下降和pH值的上升越明显。最后给出了温度与临界氯离子浓度的关系曲线。
- 高温 /
- 钢筋腐蚀 /
- 临界氯离子浓度 /
- 温度影响
Abstract: The steel rebar inside reinforced concrete structures is susceptible to corrosion when Cl-content at the surface of the steel exceeding a chloride threshold level(CTL).The CTL is an important influence on the service life of concrete structures exposed to chloride environments.Especially in high temperature regions, reinforced concrete structures are more severely damaged.The paper focused on studying the influence of high temperature on CTL.The experiment was carried out in 50 ℃ synthetic pore solution, considering the influences of electric potentials and pHs, and CTL of 95% acceptance value achieved.Results show that CTL under 50 ℃ is much smaller than that under normal temperature(25 ℃), and the controlling effect of temperature is more obvious as the corrosion potential decreases and pH value increases.Fitting curve of CTL to temperature was also presented.
- high temperature /
- steel corrosion /
- chloride threshold level( CTL) /
- influence of temperature

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参考文献(14)

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