吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (1): 112-120.doi: 10.13229/j.cnki.jdxbgxb201501017

• Orignal Article • Previous Articles     Next Articles

Corrosion damage of concrete under multi-salt soaking, freezing-thawing and dry-wet cycles

SU Xiao-ping1,WANG Qing2   

  1. 1.School of Civil Engineering, Changchun Institute of Technology, Changchun 130012, China;
    2.College of Construction Engineering, Jilin University, Changchun 130026, China
  • Received:2014-03-26 Online:2015-02-01 Published:2015-02-01

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Abstract: Experiments are conducted to investigate the damage feature, quality degradation and dynamic elastic modulus decay of concrete under multi-salt soaking, freezing-thawing and dry-wet cycles. Furthermore, the corrosion mechanism of concrete is revealed by electron microscope scanning, analysis of EDX spectrum and chemical composition analysis of the concrete microstructure. Results show that under the common action of multi-salt soaking, freezing-thawing and dry-wet cycles, quality degradation and dynamic elastic modulus decay tend to rise with the increase in the test cycles. The corrosion damage of concrete is mainly caused by the expansion effect of salt crystallization. Combined with the salt chemical erosion, the damage becomes faster and more serious. The total corrosion damage is the result of accumulation of damages caused by a variety of harmful factors.

Key words: structural engineering, salt soaking, freezing-thawing cycle, dry-wet cycle, concrete, corrosion damage

CLC Number: 

  • TU528
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