Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 278, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.122228
Keywords
Electrochemical corrosion control; Multi-species reactive transport; Electrode reactions; Thermodynamic equilibrium
Categories
Funding
- National Key Research and Development Program of China [2018YFC0705606, 2017YFC0703410]
- Nature Science Foundation of China (NSFC) [51578190, 51908453]
- China Postdoctoral Science Foundation [2020M673607XB, 2020T130497]
- Scientific Research of Shanxi Provincial Department of Education [20JK0710]
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The study proposed a numerical model of multi-species reactive transport in saturated concrete structures with electrochemical corrosion control. Laboratory experiments confirmed that the model is effective in preventing corrosion initiation and improving the corrosion resistance of concrete structures.
The ionic migration in concrete determines the efficiency of electrochemical corrosion control of reinforced concrete structures, such as electrochemical chloride extraction, electrochemical realkalization, and impressed current cathodic protection. In this study, a numerical model of the multi-species reactive transport in saturated concrete structures with electrochemical corrosion control is proposed. The proposed model includes ionic transport, thermodynamic equilibrium and electrode reactions. The electrode reactions at the surface of reinforcing steel are considered using the Tafel equation. The thermodynamic model is adopted to express the physical and chemical reactions between pore solution and hydration products. The diffusivity coefficient of material based on the variation of porosity is updated at the end of each time step of the numerical model. Additionally, a laboratory experiment is conducted to verify the numerical model. The numerical results clearly show that the applied electrochemical corrosion control based on the numerical model is capable of preventing the initiation of corrosion, avoiding the hydrogen embrittlement, arresting the Cl- penetration, and improving the pH value and CH content adjacent to the reinforcing steel. (C) 2021 Elsevier Ltd. All rights reserved.
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