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工业建筑  2011 

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

Keywords: 高温,钢筋腐蚀,临界氯离子浓度,温度影响

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Abstract:

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。

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