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矿物掺合料对钢筋锈蚀临界氯离子含量的影响
作者:张倩倩 孙伟 施锦杰  
单位:东南大学材料科学与工程学院 江苏省土木工程材料重点实验室  
关键词:钢筋锈蚀  矿物掺合料  交流阻抗谱  临界氯离子含量 
分类号:TU528
出版年,卷(期):页码:2010,38(4):633-637
DOI:
摘要:

采用交流阻抗谱检测腐蚀电流密度并判断钢筋腐蚀开始的时间,腐蚀开始后通过化学滴定法获得自由氯离子质量分数和总氯离子质量分数,研究了粉煤灰和矿渣对砂浆中引起钢筋锈蚀的临界氯离子浓度的影响规律,探讨了钢筋腐蚀过程的电化学阻抗谱变化以及粉煤灰和矿渣对氯离子结合能力的影响。结果表明:在固定水胶比和胶凝材料用量的情况下,临界氯离子质量分数随矿物掺合料掺量的增加而降低;当粉煤灰掺量达到30%(质量分数,下同)或矿渣掺量达到50%时,临界自由氯离子质量分数由0.52%分别降低到0.33%和0.21%,临界总氯离子质量分数由0.77%分别降低到0.56%和0.38%。钢筋在腐蚀过程中阻抗谱的低频区弧线半径逐渐减小,而高频区基本没变化;掺入粉煤灰和矿渣后,基体对氯离子的结合能力增强。

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The influence of fly ash and slag on the threshold chloride level was investigated.The time for steel depassivation was determined by electrochemical impedance spectroscopy.The change of the electrochemical impedance spectroscopy during corrosion of steel and the influence of mineral admixtures on chloride binding capacity were examined.The results show that for mortar matrix with constant water-binder ratio and binder content,the threshold chloride levels decrease with the increase of mineral admixtures content.The radiuses of the low frequency domain gradually decrease,but there is no change in high frequency domain during corrosion of steel.The chloride binding capacity of mortar matrix increases when mineral admixtures are added.

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基金项目:
国家“863”计划(2008AA030704)资助项目
作者简介:
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