Materials Reports  2020, Vol. 34 Issue (Z2): 227-232 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Quantitative Judgment Method for Passivation and Depassivation of Reinforcing Steel Bar in Simulated Concrete Solution |
| YU Bo1,2,3, HUANG Junming1, WAN Weiwei1, YANG Lyufeng1,2,3
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1 School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
2 Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education, Nanning 530004, China
3 Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Nanning 530004, China |
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Abstract Based on the passivation and depassivation experiments of reinforcing steel bar in simulated concrete solution, the corrosion electrochemical parameters of reinforcing steel bar during the passivation and depassivation processes were systematically investigated. Meanwhile, the quantitative judgment method for the passivation and depassivation process of reinforcing steel bar in simulated concrete solution was proposed. Simulated concrete solution and reinforcement electrode were prepared first. Then the variation of corrosion electrochemical parameters (including the open circuit potential, polarization resistance and corrosion current density) of reinforcing steel bar during passivation and depassivation process were tested by means of the half-cell potential method, the electrochemical impedance spectroscopy and the dynamic potential polarization method with the saturated calomel electrode and mercury/oxide mercury electrode as the reference electrode respectively. Finally, the quantitative judgment method for the passivation and depassivation process of reinforcing steel bar in simulated concrete solution was presented, and the critical chloride content of reinforcing steel bars during depassivation process was determined. Analysis results show that it takes about 5 days for reinforcing steel bar to complete the passivation and to form a stable passivation film during the passivation process, when the relative variation rate of open circuit potential, polarization resistance and corrosion current density along with time lower than 10% and tend to be stable. Depassivation of reinforcing steel bar will occur when the relative variation rate of open circuit potential, polarization resistance and corrosion current density along with chloride content greater than 30%, 50% and 150% respectively. The critical chloride content for depassivation of reinforcing steel bar is about 0.12 mol/L in the simulated concrete solution.
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Published: 08 January 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51668008,51738004,51678165), Guangxi Science Fund for Distinguished Young Scholars(2019GXNSFFA245004), and Natural Science Foundation of Guangxi Province(2018GXNSFAA281344). |
| About author:: Bo Yu received his Ph.D. degree in Structural Engineering at Guangxi University in 2011. He is currently a professor and Ph.D. supervisor in School of Civil Engineering and Architecture, Guangxi University. He receives the Fundation for Distinguished Young Scholars and the Youth Science and Technology Prize of Guangxi province. His main research directions are quantitative durability analysis and design of concrete structures, deterioration mechanism and safety assessment of concrete structures, and stochastic analysis and risk assessment of engineering structures.Lyufeng Yang received his Ph.D. degree in structural engineering at Wuhan University of Technology in 1998. He is currently a professor and Ph.D. supervisor in School of Civil Engineering and Architecture, Guangxi University. His research interests are the durability of concrete structure, design and optimization of bearing capacity for engineering structures, and structural reliability and system reliability. |
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1 Cao Y, Gehlen C, Angstc U, et al. Cement and Concrete Research, 2019, 117(60), 58.
2 曹楚南.腐蚀电化学原理, 化学工业出版社, 2008.
3 陈海燕, 李欢园, 陈丕茂, 等. 建筑材料学报, 2013, 16(1), 131.
4 何谋杰, 叶跃忠, 李福海. 材料导报:研究篇, 2010, 24(12), 79.
5 王丹芊, 施锦杰, 蒋金伟, 等.东南大学学报(自然科学版), 2015, 45(6), 1163.
6 张俊喜, 易博, 林德源, 等.建筑材料学报, 2016, 19(2), 390.
7 陈龙, 瞿彧, 汤雁冰, 等. 腐蚀与防护, 2014, 35(5), 446.
8 施锦杰, 孙伟, 耿国庆.建筑材料学报, 2011, 14(4), 452.
9 郭丽萍,杨波,陈波,等.水利与建筑工程学报, 2015, 13(6), 16.
10 Wang Y Z, Liu C X, Wang Y C, et al. Construction and Building Mate-rials, 2019, 214, 158.
11 商百慧, 马元泰, 孟美江, 等. 材料研究学报, 2019, 33(9), 659.
12 Zuo X B, Li X N, Liu Z Y, et al.Construction and Building Materials, 2019, 229, 116907.
13 Zheng H B, Dai J G, Li W H, et al. Construction and Building Mate-rials, 2018, 166, 572.
14 王吉会.腐蚀科学与工程试验教程, 北京大学出版社, 2013. |
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