Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 73, Issue -, Pages 699-704Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.09.111
Keywords
Compression fatigue; Steel corrosion; CTV; Electrochemical method; Grain refinement; Protective film
Categories
Funding
- National Natural Science Foundation of China [51278167, 51278168]
- Natural Science Foundation of Jiangsu Province [BK20131374]
- Six Talent Peak Project (Class A) of Jiangsu Province
- Research and Innovation Project for College Graduates of Jiangsu Province [CXLX13_237, CXZZ12_0238]
- Experimental Center of Mechanics and Materials in Hohai University
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Compression fatigue test was performed on stress level 0.8 for a group of fixed cycle numbers. The steels were soaked in the saturated Ca(OH)(2) solution, which was used as simulated concrete pore solution. NaCl was chosen as the sources of chloride ion to corrode the steels. The chloride threshold value (CTV) was detected by combining the open-circuit potential (E-corr) with corrosion current density (I-corr), which was obtained by electrochemical impedance spectroscopy (EIS). The changes of microstructure that caused by the compression fatigue were observed by optical microscopy (OM) and scanning electron microscopy (SEM). The results showed that the CTV first increased and then decreased with increasing the fatigue cycle times under a certain stress level and range of fatigue life cycles. The grains of the steels became finer and cracks appeared on the protective firms which formed quickly on the surface of the steels. The capacitive arcs under no compression fatigue decreased gradually, while the ones under compression fatigue presented no regularity due to the uneven distribution of the protective films. Cracks on the protective films propagated because of sustaining compression fatigue, which degenerated the later resistances of the steels to chloride ions. Meanwhile, the ranges of corrosion currents were declined. (C) 2014 Published by Elsevier Ltd.
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