Effect of Electrochemically Chlorine Extraction on the Corrosion State of Steel Bars and the Microstructure of Surrounding Concrete
CHEN Wenlong1, ZHOU Xudong2, ZHANG Yu1,*, ZHANG Yunsheng1, MA Zhicong1
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Guangdong Highway Construction Co.,Ltd., Guangzhou 510000, China
Abstract: In this work, using the current densities of 1 A/m2, 2 A/m2 and 3 A/m2 to carry out electrochemical chlorine extraction (ECE) treatment for 30 days on concrete with different water-cement ratios (0.47, 0.38, 0.33), the corrosion state of steel bars, chlorine extraction efficiency and residual chloride concentration distribution were obtained to evaluate the effect of ECE treatment. Througth scanning electron microscopy, X-ray diffraction and nuclear magnetic resonance test methods, explored the evolution rule of concrete hydration products and pore structure before and after ECE treatment. The results show that ECE treatment can prevent steel corrosion or restore passivation. The increase of the water-cement ratio and the current density would significantly increase the chlorine extraction efficiency of ECE. After ECE treatment, the content of Ca(OH)2 in concrete increased, and Ca(OH)2 crystals could fill the pores, so that the density of concrete near the anode increased and the porosity reduced, while the hydration products in concrete near the cathode were decomposed, resulting in porosity. After ECE treatment, the micropores (0.001—0.1 μm) in the concrete at the cathode evolved into mesopores (0.1—1 μm), which was unfavorable to the bond performance of steel-concrete.
陈文龙, 周旭东, 张宇, 张云升, 马智聪. 电化学除氯对钢筋腐蚀状态及其周围混凝土微观结构的影响[J]. 材料导报, 2024, 38(23): 23070258-8.
CHEN Wenlong, ZHOU Xudong, ZHANG Yu, ZHANG Yunsheng, MA Zhicong. Effect of Electrochemically Chlorine Extraction on the Corrosion State of Steel Bars and the Microstructure of Surrounding Concrete. Materials Reports, 2024, 38(23): 23070258-8.
1 Li Z, Jin Z Q, Shao S S, et al. Materials Reports, 2018, 32(23), 4170 (in Chinese). 李哲, 金祖权, 邵爽爽, 等. 材料导报, 2018, 32(23), 4170. 2 Liu C X. Corrosion law of steel bars in concrete under chloride ion erosion and time-varying reliability analysis of reinforced concrete structures. Ph. D. Thesis, Tianjin University, China, 2020 (in Chinese) 刘晨曦. 氯离子侵蚀下混凝土中钢筋锈蚀规律及钢筋混凝土结构时变可靠度分析. 博士学位论文, 天津大学, 2020. 3 Xia J, Li T, Fang J X, et al. Construction and Building Materials, 2019, 228, 116745. 4 Zhao H. Journal of Coastal Research, 2020, 110(S1), 266. 5 James A, Ehsan B, Alireza A C, et al. Construction and Building Materials, 2019, 224, 1026. 6 Guo Q, Li X Z, Song Y L, et al. Journal of Building Materials, 2023, 26(1), 21 (in Chinese). 郭群, 李晓珍, 宋屹林, 等. 建筑材料学报, 2023, 26(1), 21. 7 Das J K, Pradhan B. Journal of Building Engineering, 2022, 50, 104192. 8 Li Z, Li N, Zhao T J, et al. Construction and Building Materials, 2023, 369, 130617. 9 Szweda Zofia. Materials, 2023, 16(2), 666. 10 Tissier Y, Bouteiller V, Victoire E, et al. Electrochimica Acta, 2019, 317, 486. 11 Nguyen H Y T, Pansuk W, Sancharoen P, et al. KSCE Journal of Civil Engineering, 2018, 22 (8), 2942. 12 Lin H, Li Y, Li Y Q. Construction and Building Materials, 2019, 197, 228. 13 Shen E B, Fang D J, Wang Y P, et al. In: International Conference on Mechatronics Engineering and Computing Technology (ICMECT). Shanghai, 2014, pp.663. 14 de Almeida Souza L R, de Medeiros M H F, Pereira E, et al. Construction and Building Materials, 2017, 145, 435. 15 Ding Z, Xing F, Li W H. Journal of Wuhan University of Technology, 2009, 31(7), 19 (in Chinese). 丁铸, 邢锋, 李伟华. 武汉理工大学学报, 2009, 31(7), 19. 16 Fan W J, Wu Y T, Mao J H, et al. Chinese Journal of Engineering, 2021, 43(6), 778 (in Chinese). 樊玮洁, 吴云涛, 毛江鸿, 等. 工程科学学报, 2021, 43(6), 778. 17 He R, Wang T. China Journal of Highway and Transport, 2020, 33(7), 29 (in Chinese). 何锐, 王铜. 中国公路学报, 2020, 33(7), 29. 18 Zhang H L, Wang S L, Yuan X S. Chinese Journal of Materials Science and Engineering, 2022, 40(1), 40 (in Chinese). 张海龙, 王社良, 袁晓洒. 材料科学与工程学报, 2022, 40(1), 40. 19 Jin W L, Guo Z, Xu C. Journal of Chinese Society for Corrosion and Protection, 2013, 33(1), 75 (in Chinese). 金伟良, 郭柱, 许晨. 中国腐蚀与防护学报, 2013, 33(1), 75. 20 Stern M, Geary A L. Journal of the Electrochemical Society, 1957, 10(4), 56. 21 Andrade C, Alonso C. Construction Building Materials, 1996, 10(5), 315. 22 Yang J. Journal of Yangtze River Scientific Research Institute, 2020, 37(4), 127 (in Chinese). 杨晶. 长江科学院院报, 2020, 37(4), 127. 23 Wei Y M, Chai J R, Qin Y, et al. Bulletin of the Chinese Ceramic Society, 2018, 37(3), 825 (in Chinese). 魏毅萌, 柴军瑞, 覃源, 等. 硅酸盐通报, 2018, 37(3), 825. 24 Li C J, Sun Z P, Li Q, et al. Materials Reports, 2016, 30(13), 133 (in Chinese). 李春景, 孙振平, 李奇, 等. 材料导报, 2016, 30(13), 133. 25 Arya C, Newman J B. Materials and Structures, 1990, 23(5), 319. 26 Mohammed T U, Hamada H. Cement and Concrete Research, 2003, 33(9), 1487. 27 Xu G, Wen T, Wang Q, et al. Industrial Construction, 2014, 44(6), 73(in Chinese). 徐港, 温婷, 王青, 等. 工业建筑, 2014, 44(6), 73. 28 Yu L B, Jiang L H, Chu H Q, et al. Science Technology and Engineering, 2020, 20(9), 3387 (in Chinese). 于丽波, 蒋林华, 储洪强, 等. 科学技术与工程, 2020, 20(9), 3387. 29 Standard test method for half-cell potentials of uncoated reinforcing steel in concrete. ASTM Standards, 2009, pp.6. 30 Wang W Z, Zheng X M, Liu X D, et al. Concrete, 2011(3), 28 (in Chinese). 王文仲, 郑秀梅, 刘晓丹, 等. 混凝土, 2011(3), 28. 31 Sun W B, Gao X J, Yang Y Z, et al. Journal of Harbin Engineering University, 2009, 30(10), 1108 (in Chinese). 孙文博, 高小建, 杨英姿, 等. 哈尔滨工程大学学报, 2009, 30(10), 1108. 32 Deng X H, Gao X Y, Wang R, et al. Materials Reports, 2021, 35(16), 16028 (in Chinese). 邓祥辉, 高晓悦, 王睿, 等. 材料导报, 2021, 35(16), 16028. 33 Xue W P, Liu X Y, Yao Z S, et al. AMCS, 2020, 37(9), 2285 (in Chinese). 薛维培, 刘晓媛, 姚直书, 等. 复合材料学报, 2020, 37(9), 2285. 34 Zhang E F, Yang G S, Liu H. Coal Engineering, 2018, 50(10), 50 (in Chinese). 张二锋, 杨更社, 刘慧. 煤炭工程, 2018, 50(10), 50.
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2024, Vol. 38 
