Journal of Shanghai Jiao Tong University ›› 2016, Vol. 50 ›› Issue (03): 370-376.

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Service Life Prediction of Prestress High Concrete Pipe Piles in Marine Environment

YUE Zhuwen,LI Jingpei,LI Lin,SHAO Wei   

  1. (Department of Geotechnical Engineering; Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China)
  • Received:2014-12-05 Online:2016-03-28 Published:2016-03-28

Abstract: Abstract: Chlorideinduced reinforcement corrosion is the main factor in marine environment for concrete member. The service life of PHC prestress high concrete (PHC) pipe pile was divided into the initiation period and propagation periods. The initiation period, i.e., the chloride transportation time was calculated by Fick’s 2nd law using the difference method. And an elastic mechanics theory was used to solve the propagation period. The results show that the initiation period and the propagation period present linear and exponent relationship with the cover thickness, respectively. The propagation period is greatly decreased as the mortar layer thickness increases. In addition, the service life can be increased to 3 to 4 times by sealing the inner space. Finally, the calculation accuracy of the initiation period was verified by a 180 days chloride erosion test.

Key words: Key words: prestress high concrete (PHC) pipe piles, centrifugal effect, chloride ions, service life, concrete durability

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