Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations
This paper presents an experimental study and electrochemical mechanisms of microcell and macrocell corrosion kinetics of steel bars in reinforced concrete slabs subjected to three different corrosive environments and three configurations of uncorroded/corroded steel bars. Effects of combined chlori...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/169028 |
| _version_ | 1826122844983001088 |
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| author | Bui, Huy Tang Maekawa, Koichi Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Bui, Huy Tang Maekawa, Koichi Tan, Kang Hai |
| author_sort | Bui, Huy Tang |
| collection | NTU |
| description | This paper presents an experimental study and electrochemical mechanisms of microcell and macrocell corrosion kinetics of steel bars in reinforced concrete slabs subjected to three different corrosive environments and three configurations of uncorroded/corroded steel bars. Effects of combined chloride contamination and carbonation were investigated and compared to individual causes either from chloride contamination or carbonation. Under each corrosive environment, two cathode/anode area ratios, as well as steel bars-contact and -noncontact conditions, were tested. As a result, the combined chloride contamination and carbonation induced larger microcell and macrocell corrosion rates than those attacked by solely chloride or solely carbonation. Although a larger cathode/anode ratio increased macrocell current density, it actually decreased microcell rate compared to a smaller ratio. In addition, when corroded steel bars were in contact, microcell and macrocell current densities became larger than those in noncontact samples for all three corrosive environments. Based on the test results, electrochemical mechanisms of both microcell and macrocell corrosion were proposed using thermodynamic theory, anodic and cathodic polarisation kinetics to draw precious insights into the corrosion behaviour under different corrosive environments and cathode/anode ratios. |
| first_indexed | 2024-10-01T05:55:14Z |
| format | Journal Article |
| id | ntu-10356/169028 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:55:14Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1690282023-06-27T05:17:33Z Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations Bui, Huy Tang Maekawa, Koichi Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering Macrocell Mechanism Microcell Mechanism This paper presents an experimental study and electrochemical mechanisms of microcell and macrocell corrosion kinetics of steel bars in reinforced concrete slabs subjected to three different corrosive environments and three configurations of uncorroded/corroded steel bars. Effects of combined chloride contamination and carbonation were investigated and compared to individual causes either from chloride contamination or carbonation. Under each corrosive environment, two cathode/anode area ratios, as well as steel bars-contact and -noncontact conditions, were tested. As a result, the combined chloride contamination and carbonation induced larger microcell and macrocell corrosion rates than those attacked by solely chloride or solely carbonation. Although a larger cathode/anode ratio increased macrocell current density, it actually decreased microcell rate compared to a smaller ratio. In addition, when corroded steel bars were in contact, microcell and macrocell current densities became larger than those in noncontact samples for all three corrosive environments. Based on the test results, electrochemical mechanisms of both microcell and macrocell corrosion were proposed using thermodynamic theory, anodic and cathodic polarisation kinetics to draw precious insights into the corrosion behaviour under different corrosive environments and cathode/anode ratios. Ministry of National Development (MND) National Research Foundation (NRF) This research is supported by the National Research Foundation, Singapore, and Ministry of National Development, Singapore, under its Cities of Tomorrow R&D Programme (CoT Award No. COT-V2-2019-1). 2023-06-27T05:17:33Z 2023-06-27T05:17:33Z 2023 Journal Article Bui, H. T., Maekawa, K. & Tan, K. H. (2023). Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations. Cement and Concrete Composites, 138, 104989-. https://dx.doi.org/10.1016/j.cemconcomp.2023.104989 0958-9465 https://hdl.handle.net/10356/169028 10.1016/j.cemconcomp.2023.104989 2-s2.0-85149168445 138 104989 en COT-V2-2019-1 Cement and Concrete Composites © 2023 Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Macrocell Mechanism Microcell Mechanism Bui, Huy Tang Maekawa, Koichi Tan, Kang Hai Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title | Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title_full | Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title_fullStr | Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title_full_unstemmed | Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title_short | Microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode/anode configurations |
| title_sort | microcell and macrocell corrosion of steel bars in reinforced concrete slabs under different corrosive environments and cathode anode configurations |
| topic | Engineering::Civil engineering Macrocell Mechanism Microcell Mechanism |
| url | https://hdl.handle.net/10356/169028 |
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