Abstract

Reinforcement corrosion induced by chloride penetration is a major threat to reinforced concrete structures in marine environments. The use of surface treatments to improve the durability of reinforced concrete structures has drawn increasing attention in recent decades due to their cost-effectiveness and convenience in construction. However, current knowledge of a practical, durable design to protect surface-treated concrete structures from chloride-induced steel corrosion remains insufficient. On this account, a rapid numerical approach was developed in this study to analyse the chloride diffusion in bilayer materials. In this approach, the time-dependency was considered for the chloride diffusion coefficients of both the surface-treated layer and the underlying concrete substrate and for the surface chloride content. The validity of this approach was verified with the finite element method and the computation time was only one hundred-thousandth that of the latter. This proposed approach makes it feasible in practice to estimate the probability of corrosion initiation in surface-treated concrete structures via Monte Carlo simulation.

摘要

氯离子渗透引起的钢筋腐蚀是海洋环境中钢筋混凝土结构的主要威胁。近几十年来，由于表面处理的成本效益和施工方便性，使用表面处理来提高钢筋混凝土结构的耐久性越来越受到关注。然而，目前关于保护表面处理的混凝土结构免受氯化物引起的钢腐蚀的实用、耐用设计的知识仍然不足。因此，本研究开发了一种快速数值方法来分析双层材料中的氯化物扩散。在这种方法中，时间依赖性被考虑为表面处理层和底层混凝土基材的氯化物扩散系数以及表面氯化物含量。用有限元法验证了该方法的有效性，计算时间仅为后者的十万分之一。这种拟议的方法使得在实践中通过蒙特卡罗模拟来估计表面处理的混凝土结构中腐蚀开始的可能性变得可行。