Advances in concrete construction

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Service life prediction of chloride-corrosive concrete under fatigue load

  • Yang, Tao (School of Transportation, Southeast University) ;
  • Guan, Bowen (School of Material Science and Engineering, Chang'an University) ;
  • Liu, Guoqiang (School of Transportation, Southeast University) ;
  • Li, Jing (School of Transportation, Southeast University) ;
  • Pan, Yuanyuan (School of Transportation, Southeast University) ;
  • Jia, Yanshun (School of Transportation, Southeast University) ;
  • Zhao, Yongli (School of Transportation, Southeast University)
  • Received : 2018.12.13
  • Accepted : 2019.04.27
  • Published : 2019.08.25
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Abstract

Chloride corrosion has become the main factor of reducing the service life of reinforced concrete structures. The object of this paper is to propose a theoretical model that predicts the service life of chloride-corrosive concrete under fatigue load. In the process of modeling, the concrete is divided into two parts, microcrack and matrix. Taking the variation of mcirocrack area caused by fatigue load into account, an equation of chloride diffusion coefficient under fatigue load is established, and then the predictive model is developed based on Fick's second law. This model has an analytic solution and is reasonable in comparison to previous studies. Finally, some factors (chloride diffusion coefficient, surface chloride concentration and fatigue parameter) are analyzed to further investigate this model. The results indicate: the time to pit-to-crack transition and time to crack growth should not be neglected when predicting service life of concrete in strong corrosive condition; the type of fatigue loads also has a great impact on lifetime of concrete. In generally, this model is convenient to predict service life of chloride-corrosive concrete with different water to cement ratio, under different corrosive condition and under different types of fatigue load.

Keywords

Acknowledgement

Supported by : Natural Science Foundation of China

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