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Open AccessArticle

Effect of Imidazoline Inhibitor on the Rehabilitation of Reinforced Concrete with Electromigration Method

by Chonggen Pan 1,2,*, Jianghong Mao 1,2,* and Weiliang Jin 3
1
Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
2
Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
3
Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(2), 398; https://doi.org/10.3390/ma13020398
Received: 30 October 2019 / Revised: 24 December 2019 / Accepted: 6 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Corrosion of Reinforcing Steel in Reinforced Concrete)
Steel bars embedded in reinforced concrete are vulnerable to corrosion in high chloride environments. Bidirectional electromigration rehabilitation (BIEM) is a novel method to enhance the durability of reinforced concrete by extracting chloride out of concrete and introducing an inhibitor to the surface of the steel bar under the action of an electric field. During the migration process, a higher ionization capacity of the inhibitor with a symmetrical molecular structure was introduced. A new imidazoline inhibitor was, therefore, employed in this study due to its great ionization capacity. The effect of imidazoline and triethylenetetramine inhibitor on chloride migration, corrosion potential, and strength of concrete were explored. The research results showed that the effect of chloride extraction and electrochemical chloride extraction made no significant difference on the surface of the concrete, where chloride extraction efficiency was more than 70%, and the chloride extraction efficiency was more than 90% around the location of the steel. while a dry-wet cycle test, the potential of concrete increased by about 200 mV by mixing imidazoline inhibitor. The imidazoline inhibitor was found to be effective at facilitating chloride migration and ameliorating corrosion, meanwhile, it had a negligible impact on the concrete’s strength. View Full-Text
Keywords: reinforced concrete; durability; imidazoline inhibitor; chloride reinforced concrete; durability; imidazoline inhibitor; chloride
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MDPI and ACS Style

Pan, C.; Mao, J.; Jin, W. Effect of Imidazoline Inhibitor on the Rehabilitation of Reinforced Concrete with Electromigration Method. Materials 2020, 13, 398.

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