Corrosion Resistance of 2205 Stainless Steel Bar in Modified Coral Concretes

doi:10.11902/1005.4537.2023.181

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 789-796 DOI: 10.11902/1005.4537.2023.181

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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

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.

Key words: coral concrete stainless steel bar fly ash strengthened coarse aggregate corrosion rate

Received: 30 May 2023 32134.14.1005.4537.2023.181

ZTFLH:

TU511

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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https://www.jcscp.org/EN/10.11902/1005.4537.2023.181 OR https://www.jcscp.org/EN/Y2024/V44/I3/789

Fig.1 Photo of the stainless steel reinforced coral concrete samples

Fig.2 Compressive strengths of the coral concretes modified by using FA (a) and cement or cement-metakaolin slurry (b)

Fig.3 Open circuit potentials of 2205 stainless steel reinforcement in modified coral concretes by using FA (a) and cement or cement-metakaolin slurry (b)

Fig.4 R_p values of 2205 stainless steel reinforcement in modified coral concretes by using FA (a) and cement or cement- metakaolin slurry (b)

Fig.5 I_corrvalues of 2205 stainless steel reinforcement in modified coral concretes by using FA (a) and cement or cement- metakaolin slurry (b), comparison of I_corr values in two types of modified coral concretes (c)

Fig.6 Nyquist plots of 2205 stainless steel reinforcement of FA modified coral concretes after immersion in 3.5%NaCl solution for 10 d (a), 180 d (b), 360 d (c) and 880 d (d)

Fig.7 Nyquist plots of 2205 stainless steel reinforcement of the coral concretes modified by using cement or cement- metakaolin slurry after immersion in 3.5%NaCl solution for 10 d (a), 180 d (b), 360 d (c) and 1000 d (d)

Fig.8 Equivalent circuit for fitting EIS data

Fig.9 R_convalues of the coral concretes by using FA (a) and cement or cement- metakaolin slurry (b)

Fig.10 R_ctvalues of the interfaces of stainless steel reinforcement and concretes modified by using FA (a) and cement or cement- metakaolin slurry (b)

Fig.11 Calculated I_corr-EISvalues of 2205 stainless steel reinforcement in the coral concretes modified by using FA (a) and cement or cement- metakaolin slurry (b) based on EIS, comparison of I_corr-EISvalues in two types of modified coral concrete (c)

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