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The Effect of a Corrosion Inhibitor on the Rehabilitation of Reinforced Concrete Containing Sea Sand and Seawater

by Chonggen Pan 1,2,3, Xu Li 1,2 and Jianghong Mao 1,3,*
1
Ningbo institute of Technology, Zhejiang University, Ningbo 315100, China
2
Department of Civil Engineering, Shanghai University, Shanghai 200000, China
3
Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1480; https://doi.org/10.3390/ma13061480
Received: 1 January 2020 / Revised: 13 February 2020 / Accepted: 2 March 2020 / Published: 24 March 2020
(This article belongs to the Section Construction and Building Materials)
Concrete made with sea sand and seawater is rich in chlorine ions which are the main factors that induce corrosion of the reinforcement. In this study, an innovative method to rehabilitate reinforcement is presented; the concentrations of chloride ions and the corrosion inhibitor in concrete were measured. Electrochemical chloride extraction (ECE) was applied as a control experiment via using saturated Ca(OH)2 solution as an external electrolyte. Bidirectional electromigration (BIEM)technology combined with the corrosion inhibitor could not only remove the chloride ions but also protect the steel bar in concrete, and animidazoline inhibitor mixed in concrete is more effective than thetriethylenetetramine inhibitor due to the specific molecular structure. It was found that the optimum ratio of N/Cl reached the maximum value 3.3, when the concentration of inhibitor was 1. Meanwhile, the experimental results also revealed that the corrosion inhibitor and chloride ion concentrations reached necessary levels on the surface of the steel, and the corrosion inhibitor migrated effectively. Overall, the contents of imidazoline and triethylenetetramine inhibitor in seawater concrete are0.75% and 1%, respectively. The results demonstrate that the addition of the corrosion inhibitor and the application of bidirectional electromigration would effectively improve the durability of reinforced concrete containing sea sand and seawater. View Full-Text
Keywords: reinforced concrete; sea sand; durability; inhibitor; bidirectional electromigration(BIEM) reinforced concrete; sea sand; durability; inhibitor; bidirectional electromigration(BIEM)
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Pan, C.; Li, X.; Mao, J. The Effect of a Corrosion Inhibitor on the Rehabilitation of Reinforced Concrete Containing Sea Sand and Seawater. Materials 2020, 13, 1480.

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