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Corrosion Resistance of 2205 Stainless Steel Bar in Modified Coral Concretes |
FENG Xingguo1, GU Zhuoran1, FAN Qiqi1, LU Xiangyu1( ), YANG Yashi2 |
1. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China 2. School of Hydraulic Engineering, Wanjiang University of Technology, Maanshan 243000, China |
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Cite this article:
FENG Xingguo, GU Zhuoran, FAN Qiqi, LU Xiangyu, YANG Yashi. Corrosion Resistance of 2205 Stainless Steel Bar in Modified Coral Concretes. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 789-796.
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Abstract The effect of different modification schemes for strengthening the coral coarse aggregate, namely direct incorporation of fly ash, cement slurry or cement-metakaolin composite slurry, on the corrosion rate of 2205 stainless steel bars in the coral concretes was comparatively assessed so that to search insight the way to improve the durability of stainless steel reinforced coral concrete structure. The results show that the 2205 stainless steel bar always maintained a passivation state in the coral concrete. The incorporation of fly ash can reduce the corrosion rate of 2205 stainless steel bar, but the direct addition of fly ash may significantly decrease the strength of coral concrete. With P.O 52.5 cement slurry or P.O 52.5 cement-metakaolin composite slurry as modifier can strengthen coral coarse aggregate, but the strength of coral concrete prepared with the modified crude aggregate has little difference with that of the control group, while the corrosion rate of 2205 stainless steel bar in the coral concrete strengthened with the coarse aggregate is significantly reduced. Among others, the corrosion rate of 2205 stainless steel bar is the lowest in the concrete of coarse aggregate reinforced with P.O 52.5 cement-metakaolin composite slurry In conclusion, using P.O 52.5 cement-metakaolin composite slurry to enhance coral coarse aggregate can effectively improve the durability of stainless steel reinforced coral concrete structures by providing high strength and greatly reducing the corrosion rate of 2205 stainless steel bar.
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Received: 30 May 2023
32134.14.1005.4537.2023.181
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Fund: National Key R&D Program of China(2022YFB3207400);Research Funds for the central Universities(TKS20220601) |
Corresponding Authors:
LU Xiangyu, E-mail: luxiangyu@hhu.edu.cn
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