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氯离子引起的钢筋锈蚀是影响钢筋混凝土结构耐久性的主要原因之一。基于Fick第二定律,推导了PHC(Prestress high concrete)管桩氯离子扩散的解析解,并对PHC管桩设计寿命进行了预测,且考虑了离心分层和温度作用对PHC管桩设计寿命的影响。结果表明:离心分层和温度对PHC管桩中氯离子扩散影响较大,而初始氯离子含量对其影响较小。综合考虑离心分层和温度影响,确定了海工环境中PHC管桩的设计要求,即对于要求服役寿命大于50a的工程,壁厚应大于100mm,且砂浆层不宜大于10mm,而对于服役寿命要求大于100a的工程,应选用壁厚150mm的PHC管桩,且砂浆层宜小于30mm。
Corrosion caused by chloride ion is one of the main reasons that affect the durability of reinforced concrete structures. Based on Fick’s second law, the analytic solution of chloride ion diffusion in PHC (Prestress high concrete) tubular piles was deduced, and the design life of PHC piles was predicted. Considering the influence of centrifugal stratification and temperature on the design life of PHC piles, influences. The results showed that centrifugal delamination and temperature had a significant effect on the chloride ion diffusion in PHC pipe piles, while the initial chloride ion content had little effect on it. Considering the effects of centrifugal stratification and temperature, the design requirements of PHC pipe piles in marine environment are determined. For the projects that require service life greater than 50a, the wall thickness should be greater than 100mm and the mortar layer should not be larger than 10mm. For service life requirements For projects larger than 100a, PHC pipe piles with a wall thickness of 150mm should be used, and the mortar layer should be less than 30mm.