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Life Prediction and Long-Term Durability of Coated Steel Bars in Magnesium Oxychloride Concrete
https://orcid.org/http://orcid.org/0000-0001-8704-5786
https://orcid.org/http://orcid.org/0000-0002-0289-1949
https://orcid.org/http://orcid.org/0000-0003-4664-3282
https://orcid.org/http://orcid.org/0000-0002-6797-9159
https://orcid.org/http://orcid.org/0000-0002-4298-6248
The solution to the problem of corrosion of the steel bars in magnesium oxychloride cement concrete (MOCC) is to apply a coating that protects the steel. To investigate the coating’s long- term protective effect on the steel, a solution immersion accelerated corrosion test was carried out on coated reinforced MOCC for up to 2,160 days. Electrochemical tests were conducted every 90 days to measure the polarization curve and AC impedance during the steel bars’ corrosion process. Then, the corrosion current density that characterizes the corrosion of a coated steel bar was used as a degradation index, and the time to the coated steel bar’s corrosion was predicted based on the Wiener function. It was concluded that after 2,160 days of solution immersion, the coated steel bars’ corrosion current density was 0.063 µA·cm−2, indicating that the coating protected the steel bars in MOCC from corrosion well. Thdroughout the immersion process, the specimen’s corrosion current density showed a steady and increasing trend, and its polarization impedance showed a volatile growth trend. The degradation of the coated steel bars also obeyed the Wiener degradation process, and the bars reached a severely rusted state at 21,800d with a corrosion time of R0.6(t) is 10,650d.
Life Prediction and Long-Term Durability of Coated Steel Bars in Magnesium Oxychloride Concrete
https://orcid.org/http://orcid.org/0000-0001-8704-5786
https://orcid.org/http://orcid.org/0000-0002-0289-1949
https://orcid.org/http://orcid.org/0000-0003-4664-3282
https://orcid.org/http://orcid.org/0000-0002-6797-9159
https://orcid.org/http://orcid.org/0000-0002-4298-6248
The solution to the problem of corrosion of the steel bars in magnesium oxychloride cement concrete (MOCC) is to apply a coating that protects the steel. To investigate the coating’s long- term protective effect on the steel, a solution immersion accelerated corrosion test was carried out on coated reinforced MOCC for up to 2,160 days. Electrochemical tests were conducted every 90 days to measure the polarization curve and AC impedance during the steel bars’ corrosion process. Then, the corrosion current density that characterizes the corrosion of a coated steel bar was used as a degradation index, and the time to the coated steel bar’s corrosion was predicted based on the Wiener function. It was concluded that after 2,160 days of solution immersion, the coated steel bars’ corrosion current density was 0.063 µA·cm−2, indicating that the coating protected the steel bars in MOCC from corrosion well. Thdroughout the immersion process, the specimen’s corrosion current density showed a steady and increasing trend, and its polarization impedance showed a volatile growth trend. The degradation of the coated steel bars also obeyed the Wiener degradation process, and the bars reached a severely rusted state at 21,800d with a corrosion time of R0.6(t) is 10,650d.
Life Prediction and Long-Term Durability of Coated Steel Bars in Magnesium Oxychloride Concrete
https://orcid.org/http://orcid.org/0000-0001-8704-5786
https://orcid.org/http://orcid.org/0000-0002-0289-1949
https://orcid.org/http://orcid.org/0000-0003-4664-3282
https://orcid.org/http://orcid.org/0000-0002-6797-9159
https://orcid.org/http://orcid.org/0000-0002-4298-6248
The solution to the problem of corrosion of the steel bars in magnesium oxychloride cement concrete (MOCC) is to apply a coating that protects the steel. To investigate the coating’s long- term protective effect on the steel, a solution immersion accelerated corrosion test was carried out on coated reinforced MOCC for up to 2,160 days. Electrochemical tests were conducted every 90 days to measure the polarization curve and AC impedance during the steel bars’ corrosion process. Then, the corrosion current density that characterizes the corrosion of a coated steel bar was used as a degradation index, and the time to the coated steel bar’s corrosion was predicted based on the Wiener function. It was concluded that after 2,160 days of solution immersion, the coated steel bars’ corrosion current density was 0.063 µA·cm−2, indicating that the coating protected the steel bars in MOCC from corrosion well. Thdroughout the immersion process, the specimen’s corrosion current density showed a steady and increasing trend, and its polarization impedance showed a volatile growth trend. The degradation of the coated steel bars also obeyed the Wiener degradation process, and the bars reached a severely rusted state at 21,800d with a corrosion time of R0.6(t) is 10,650d.
Life Prediction and Long-Term Durability of Coated Steel Bars in Magnesium Oxychloride Concrete
KSCE J Civ Eng
Wang, Penghui (author) / Qiao, Hongxia (author) / Chen, Kefan (author) / Li, Yuanke (author) / Feng, Qiong (author)
KSCE Journal of Civil Engineering ; 24 ; 2120-2131
2020-07-01
12 pages
Article (Journal)
Electronic Resource
English
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