粘贴加固混凝土氯离子扩散的理论模型和数值模拟
Modelling and prediction of chloride diffusion in concrete strengthened by externally bonding

基于物质非稳态扩散理论，采用现有研究对Fick第二定律的修正方法，并将粘贴加固考虑为对氯离子扩散方程边界条件的调整，提出可用于粘贴加固混凝土的氯离子扩散理论模型。利用ABAQUS、MATLAB PDE tool、MATLAB自编程3种方法均可对粘贴加固混凝土梁的氯离子扩散过程进行数值模拟。对比未加固与加固构件的氯离子扩散规律，发现粘贴加固可降低钢筋表面的氯离子浓度值，延缓氯离子浓度到达临界锈蚀浓度的时间，增加材料使用寿命，并且加固时间越早，增加寿命越长。
Based on the revised Fick's second law, a chloride diffusion model was established for bonded strengthened concrete. The influence of bonded reinforcement was considered as change of boundary conditions. This model could be applied to predict chloride diffusion in both non-strengthened and strengthen concrete. Numerical simulation of chloride diffusion in a reinforced concrete beam strengthened by externally bonding was carried out by ABAQUS, MATLAB PDE tool, MATLAB programming. Comparison of chloride diffusion in strengthened and non-strengthened specimens was conducted. The simulation results showed the service life of RC specimens could be extended by bonding externally.