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Degradation of bond between steel bar and freeze-thaw concrete after electrochemical chloride extraction

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Abstract

The effect of electrochemical chloride extraction (ECE) on bond strength between steel bar and freeze-thaw concrete contaminated by chloride was experimentally investigated for beam specimens with dimensions of 100 mm×100 mm×400 mm. During the experiment, 3% NaCl (vs mass of cement, mass fraction) was mixed into concrete to simulate chloride contamination, and the specimens experienced 0, 25, 50, 75 freeze-thaw cycles before ECE. In the process of ECE, different current densities and durations were adopted. It is indicated that the bond strength between reinforcement and concrete decreases with the increase of freeze-thaw cycles; the more the current and the electric quantity of ECE are, the more the loss of bond strength is; and the largest loss is up to 58.7%. So, it is important to choose proper parameters of ECE for the reinforced concrete structures contaminated by chloride and subjected to freeze-thaw cycles.

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China

    Yu-xia Guo  (郭育霞) & Jin-xin Gong  (贡金鑫)

Authors
  1. Yu-xia Guo  (郭育霞)
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  2. Jin-xin Gong  (贡金鑫)
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Correspondence to Yu-xia Guo  (郭育霞).

Additional information

Foundation item: Project(IRT0518) supported by the Program of Innovative Team of the Ministry of Education of China

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Guo, Yx., Gong, Jx. Degradation of bond between steel bar and freeze-thaw concrete after electrochemical chloride extraction. J. Cent. South Univ. Technol. 17, 388–393 (2010). https://doi.org/10.1007/s11771-010-0057-8

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  • DOI: https://doi.org/10.1007/s11771-010-0057-8

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