【摘要】 文章通过对管片混凝土氯离子侵蚀机理的分析,在Fick第二扩散定律基础上,推导出了综合考虑时间、扩散深度的变扩散系数氯离子侵蚀模型;通过对管片抗侵蚀性能试验数据的分析,验证了该侵蚀模型的有效性和可靠性,并与传统的恒定扩散系数的Fick第二扩散定律模型进行了对比。分析结果表明:该模型不仅能反映结构实际受氯盐侵蚀的发展趋势和混凝土不同深度处的氯离子浓度,而且能预测不同时期、不同深度处的氯离子含量,进而可预测钢筋开始锈蚀的时间。更多还原

【Abstract】 By analyzing the mechanism of chloride ion erosion in concrete segments, andbased on the Fick second diffusion law, the chloride ion erosion model with variable diffusion coefficients was set up, in which the time, and diffusion depth were taken into consideration comprehensively. The effectiveness and reliability of this model was verified by an analysis of experimental data concerning the anti-erosion performance of tunnel segments. Compared to the conventional Fick second diffusion law model considering constant diffusion coefficients, this model can not only reflect the development trend of chloride ion erosion of the structure itself and the chloride ion concentration in concretes at various depths, but also predict the chloride ion content in different phases or at various depths. Furthermore, it can predict when corrosion will occur in reinforcements.更多还原