同济大学学报（自然科学版）2025，Vol.53Issue(4)：531-538,660,9.DOI:10.11908/j.issn.0253-374x.23295
非饱和混凝土中钢筋初锈时间的参数敏感性分析
Parametric Sensitivity Analysis of Corrosion Initiation Time for Reinforcing Bars in Unsaturated Concrete
摘要
Abstract
A diffusion-convection governing equation for chloride transport was established based on the Fick's second law and Darcy's law.Variations of chloride profile and degree of water saturation during each wetting-drying cycle were obtained by using COMSOL Multiphysics software to numerically simulate the diffusion-convection process.Sensitivity of corrosion initiation time to different influencing factors was analyzed.The results indicate that the coupled effects of convection and diffusion lead to the existences of convection zone and peak chloride content.The peak chloride content significantly increases as the exposure duration increases.Convection effect only dominates the chloride transport in the shallow zone of concrete,the chloride transport in the deep zone is governed by diffusion.Corrosion initiation time is most sensitive to the variation of critical chloride content,followed by the concrete cover depth,chloride diffusion coefficient,convection zone depth and peak chloride content.关键词
非饱和混凝土/钢筋/扩散-对流/干湿循环/初锈时间/敏感性分析Key words
unsaturated concrete/reinforcing bar/diffusion-convection/wetting-drying cycle/corrosion initiation time/sensitivity analysis分类
土木建筑引用本文复制引用
李辰治,宋晓滨,黄庆华,姜超..非饱和混凝土中钢筋初锈时间的参数敏感性分析[J].同济大学学报（自然科学版）,2025,53(4):531-538,660,9.基金项目
国家自然科学基金(51938013) （51938013）
中央高校基本科研业务费专项资金(22120220568) （22120220568）
