Study on Energized Corrosion Mechanism of Reinforced Concrete in Groundwater Environment of Lanzhou Metro
QIAO Guobin1,2, QIAO Hongxia1,2, LU Chenggong1
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: In view of the problem that the groundwater environment of Lanzhou Metro Line 1 contains a lot of corrosive ions, which leads to premature corrosion of reinforcement in concrete, this work simulated the groundwater environment, and carried out energized and accelerated corrosion test on three kinds of reinforced concrete specimens with different water binder ratio in which. The electrical nondestructive test was used to characterize the corrosion degree of rebars, and a microscopic test was used to verify the test results, and the corrosion laws of rebars were comprehensively analyzed. Finally, the corrosion coefficient k is derived and defined as an evaluation parameter to characterize the corrosion degree of reinforcement, and its rationality is verified. The results show that, with the aggravation of energized corrosion, the resistance value of steel bars decreases first and then increases, and the specimens of low water-binder ratio decreased more obviously; the current value of steel bar continues to drop, and the rate of decline follows the law of "slow-fast-slow"; the microscopic results have the same law as the measured data. The definition of corrosion coefficient k confirms that the difference in concrete protectiveness will lead to differences in corrosion products from the perspective of corrosion products.
1 China Concrete & Cement-based Products Association. China Concrete, 2016(8), 8 (in Chinese). 中国混凝土与水泥制品协会.混凝土世界, 2016(8), 8. 2 Jin W L, Zhao Y X. Journal of Zhejiang University(Engineering Science), 2002(4), 27 (in Chinese). 金伟良, 赵羽习. 浙江大学学报(工学版), 2002(4), 27. 3 Chen G X. Journal of China Institute of Water Resources and Hydropower Research, 2009, 7(2), 280 (in Chinese). 陈改新. 中国水利水电科学研究院学报, 2009, 7(2), 280. 4 Li X, Zhang D, Liu Z, et al. Nature, 2015, 527(7579), 441. 5 Yu H F, Liu L X, Cao J D, et al. Journal of Shenyang Jianzhu University(Natural Science), 2005(2), 125(in Chinese). 余红发, 刘连新, 曹敬党, 等. 沈阳建筑大学学报(自然科学版), 2005(2), 125. 6 Hong N F. Industrial Construction, 1998(1), 5 (in Chinese). 洪乃丰. 工业建筑, 1998(1), 5. 7 Yu H F. Study on high performance concrete in salt lake: durability, mechanism and service life prediction. Ph.D. Thesis, Southeast University, China, 2004 (in Chinese). 余红发. 盐湖地区高性能混凝土的耐久性、机理与使用寿命预测方法. 博士学位论文, 东南大学, 2004. 8 Odler I, Gasser M. Journal of the American Ceramic Society, 2010, 71(11), 1015. 9 Shi J J, Sun W. Journal of the Chinese Ceramic Society, 2010, 38(9), 1753(in Chinese). 施锦杰, 孙伟. 硅酸盐学报, 2010, 38(9), 1753. 10 Ou G, Feng T, Debao L, et al. Journal of Wuhan University of Technology(Materials Science), 2016, 31(2), 345. 11 Yuan Y S, Zhang X S, Ji Y S. China Civil Engineering Journal, 2006(3), 42(in Chinese). 袁迎曙,章鑫森,姬永生. 土木工程学报, 2006(3), 42. 12 Uomoto T, Tsuji K, Kakizawa T. Transaction of Japan Concrete Institute, 1985, 6,163. 13 Feng W P. Experimental research on the electric accelerated corrosion method and the current efficiency. Master's Thesis, Shenzhen University, China, 2015 (in Chinese). 冯伟鹏. 钢筋通电加速锈蚀方法与锈蚀效率的研究及其应用. 硕士学位论文, 深圳大学, 2015. 14 Gao R D. Micro-macro degradation regularity of sulfate attack on concrete under complex environments.Ph.D. Thesis, Tsinghua University, China, 2010 (in Chinese). 高润东. 复杂环境下混凝土硫酸盐侵蚀微-宏观劣化规律研究. 博士学位论文, 清华大学, 2010. 15 Wang S, Larry B, Fernando F. Fuel, 2008, 87( 3), 372. 16 Escalante-Garcia J I. Cement & Concrete Research, 2003, 33(11), 1883. 17 Andrade C, Alonso C. Construction & Building Materials, 2001, 15(2/3), 141. 18 Zheng F, Shi G Y, Dong B Q,et al. Journal of the Chinese Ceramic Society, 2018, 46(8), 1081(in Chinese). 郑帆, 史桂昀, 董必钦, 等. 硅酸盐学报, 2018, 46(8), 1081. 19 Ma H Y, Jia Z J, Wu X R,et al. Energy Storage Science and Technology, 2012(2), 57(in Chinese). 马洪运, 贾志军, 吴旭冉, 等. 储能科学与技术, 2012(2), 57. 20 Ji Y S, Zhang L L, Ma H R,et al. Journal of Central South University(Science and Technology), 2012, 43(11), 4484(in Chinese). 姬永生, 张领雷, 马会荣, 等. 中南大学学报(自然科学版), 2012, 43(11), 4484.
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2022, Vol. 36 
