Influence of simulated concrete pore solution on reinforcing steel passivation

被引：0
|
作者：
Shi J.-J. [1 ,2 ]
Sun W. [1 ,2 ]
Geng G.-Q. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Southeast University
[2] Jiangsu Key Laboratory of Construction Materials, Southeast University
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2011年 / 14卷 / 04期
关键词：
Cyclic polarization; Electrochemical impedance spectroscopy; Mott-Schottky curve; Passivation; Passive film; Reinforcing steel; Simulated concrete pore solution;
D O I：
10.3969/j.issn.1007-9629.2011.04.004
中图分类号：
学科分类号：
摘要：
The effect of simulated concrete pore solutions with different pH values and some anions on the passivation of reinforcing steel was studied by means of linear polarization resistance(LPR), electrochemical impedance spectroscopy(EIS), cyclic polarization and Mott-Schottky curves. The results indicate that the increase in pH value facilitates the formation of passive film of reinforcing steel. It has been found that for the reinforcing steel to be passivated, it needs to be kept about 7 d in CP solution with pH=13.63 and 10 d in CH solution with pH=12.54. However, passive film may not be perfectly formed in CN solution with pH=11.00. The pH value of concrete pore solution decreases evidently when lots of supplementary cementitious materials(SCMs) are added. Therefore, the amount of SCMs should be controlled in view of the formation and stability of passive film. The results also show that the addition of SO42- and SiO32- in CP solution allows the increase in the polarization resistance, promoting the passivation of reinforcing steel, particularly for SiO32-.
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页码：452 / 458
页数：6
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