后张法预应力混凝土大直径管桩耐久性与寿命预测研究

该文通过室内试验测试大管桩混凝土本体耐久性参数，并将其作为耐久性退化和寿命预测研究的初始边界条件。对国内几个地区服役多年的大管桩码头开展耐久性调研和现场取芯测试分析，获得在役大管桩混凝土氯离子浓度分布数据。基于对大量数据统计分析，获得在役大管桩混凝土表面氯离子浓度、氯离子扩散系数、氯离子渗透深度等耐久性状态参数，研究大管桩混凝土受氯离子侵蚀的规律。在上述研究基础上，以Fick第二定律数学模型为核心建立大管桩寿命预测模型，开发寿命预测软件。该研究为大管桩耐久性设计、使用和维护提供理论与试验依据。 关键词：

Research on durability and life prediction for raymond cylinder pile

 In this study, the concrete durability parameters of raymond cylinder pile were tested in laboratory and utilized as the initial boundary conditions for the research of durability degradation and life prediction. Based on the durability survey and on-site core analysis of several domestic large pipe pile wharfs in active service for many years, the distribution data of chloride ion concentration in concrete of large pipe pile in use were achieved. Based on the statistical analysis on large amount of data, those durability state parameters, such as the chloride ion concentration, the chloride ion diffusion coefficient, and the chloride ion penetration depth on concrete surface of large pipe pile were obtained, and the law of chloride ion erosion into large pipe pile concrete was studied. Furthermore, on the basis of the mathematical model of Fick′s second law, a life prediction model of raymond cylinder pile was established, and the software for the life prediction of raymond cylinder pile was developed. Therefore, this study provides a theoretical and experimental reference for durability design, use and maintenance of raymond cylinder pile.