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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2020, Vol. 54 Issue (1): 64-72    DOI: 10.3785/j.issn.1008-973X.2020.01.008
Civil Engineering, Transportation Engineering     
Experimental study on fatigue properties of steel bars after electrochemical repair
Jiang-xing LONG1,2(),Wei-liang JIN1(),Jun ZHANG2,*(),Jiang-hong MAO2,Lei CUI2
1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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Abstract  

The axial tensile fatigue test of steel bars after electrochemical chloride extraction and bidirectional electromigration rehabilitation was conducted in order to analyze the influence of electrochemical repair on the fatigue properties of steel bars. The mechanism of fatigue properties changes of steel bars caused by chemical repair techniques was explained based on the fracture mechanics principle and the fracture micromorphology. Results show that electrochemical chloride extraction causes the fatigue crack threshold of the steel bar to decrease and the fatigue elastic modulus to degrade. The macroscopic phenomenon is the reduction of fatigue life. The fatigue cracks of steel bars originated from the white point in the steel after electrochemical chloride removal, the fatigue striation spacing increases, and the dimples in the short-term fault zone become smaller and lighter. The bidirectional electromigration rehabilitation with the rust inhibitor has less negative impact on the fatigue performance of the steel bar. There are no obvious changes in the micromorphology of the steel bars after bidirectional electromigration.

Key words： electrochemical chloride extraction      bidirectional electromigration rehabilitation      current density      hydrogen embrittlement      steel fatigue     
Received: 07 December 2018      Published: 05 January 2020
CLC:  U 441  
  TU 375  
Corresponding Authors: Jun ZHANG     E-mail: longjiangxing@zju.edu.cn;jinwl@zju.edu.cn;zj@nit.zju.edu.cn
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Jiang-xing LONG
Wei-liang JIN
Jun ZHANG
Jiang-hong MAO
Lei CUI
Cite this article:

Jiang-xing LONG,Wei-liang JIN,Jun ZHANG,Jiang-hong MAO,Lei CUI. Experimental study on fatigue properties of steel bars after electrochemical repair. Journal of ZheJiang University (Engineering Science), 2020, 54(1): 64-72.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.01.008     OR     http://www.zjujournals.com/eng/Y2020/V54/I1/64


电化学修复后钢筋疲劳性能试验研究

为了探明电化学修复对钢筋疲劳性能的影响，开展电化学除氯和双向电迁处理后钢筋的轴向拉伸疲劳试验. 基于断裂力学原理及断口微观形貌分析，揭示电化学修复技术引起钢筋疲劳性能变化的机理. 结果表明，电化学除氯会引起钢筋疲劳裂纹门槛值的减小及疲劳弹性模量的退化，宏观表现为钢筋疲劳寿命减小；电化学除氯后钢筋疲劳裂纹起源于钢中白点，裂纹扩展区疲劳辉纹间距增大，瞬断区韧窝变小变浅. 掺入阻锈剂的双向电迁方法对钢筋疲劳性能的负面影响较小，双向电迁修复后钢筋的疲劳断口微观形貌相对于普通钢筋未见明显变化.


关键词： 电化学除氯,  双向电迁,  电流密度,  氢脆,  钢筋疲劳 
Fig.1 Electrochemical repair schematic
Fig.2 Site map of electrochemical repair test
Fig.3 Cross rib grinding of steel bar clamping end
Fig.4 Fatigue loading site map
试件编号 I/（A·m?2） t/周 ${\sigma _{\max }}$ $\Delta{\sigma}$/MPa Nf/次 Dfrac1)/mm
注：1）断裂部位指钢筋断口距下夹头表面的距离，部分试件断于夹头处数据视为试验失败，未列出.
C-0.5 ? ? 0.5 ${\sigma _{\rm{u}}}$ 220.28 920 846 295
E-1-0.5 1 2 0.5 ${\sigma _{\rm{u}}}$ 220.28 908 345 42
E-3-0.5 3 2 0.5 ${\sigma _{\rm{u}}}$ 220.28 846 547 156
E-5-0.5 5 2 0.5 ${\sigma _{\rm{u}}}$ 220.28 786 583 35
C-0.6 ? ? 0.6 ${\sigma _{\rm{u}}}$ 275.31 410 096 266
E-1-0.6 1 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 381 668 38
E-3-0.6 3 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 352 908 295
E-5-0.6 5 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 321 572 253
B-1-0.6 1 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 389 097 274
B-3-0.6 3 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 409 368 244
B-5-0.6 5 2 0.6 ${\sigma _{\rm{u}}}$ 275.31 393 830 291
C-0.65 ? ? 0.65 ${\sigma _{\rm{u}}}$ 302.85 326 505 228
E-1-0.65 1 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 311 655 216
E-3-0.65 3 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 302 422 84
E-5-0.65 5 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 284 783 148
B-1-0.65 1 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 318 634 53
B-3-0.65 3 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 317 548 132
B-5-0.65 5 2 0.65 ${\sigma _{\rm{u}}}$ 302.85 321 493 258
C-0.7 ? ? 0.7 ${\sigma _{\rm{u}}}$ 330.39 233 588 280
E-1-0.7 1 2 0.7 ${\sigma _{\rm{u}}}$ 330.39 222 274 夹头
E-3-0.7 3 2 0.7 ${\sigma _{\rm{u}}}$ 330.39 191 616 夹头
E-5-0.7 5 2 0.7 ${\sigma _{\rm{u}}}$ 330.39 186 272 290
Tab.1 Fatigue test results of rebars
Fig.5 Residual strain curve under different current density
Fig.6 Stress-strain hysteresis curves at 1/2 life-time
Fig.7 Fatigue strain amplitude of steel bars at different current densities
Fig.8 Fatigue life under two different current densities
Fig.9 S-N curve of ECE group
Fig.10 Microscopic morphology of fatigue source area
Fig.11 Fatigue striation of crack propagation area
Fig.12 Morphological characteristics of dimples in short-break zone
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