硅酸盐通报2024，Vol.43Issue(6)：2102-2110,9.
冻融循环下混凝土中氯离子传输机制细观模拟
Mesoscopic Simulation of Chloride Ion Transport Mechanism in Concrete under Freeze-Thaw Cycles
摘要
Abstract
Based on the classical stress level-fatigue life equation,a mathematical expression for chloride ion diffusion coefficient was proposed with the number of freeze-thaw cycles as independent variable.Furthermore,a three-dimensional mesoscopic numerical model of chloride ion transport in concrete under freeze-thaw cycles was established to investigate the effects of freeze-thaw cycles,mesoscopic structural characteristics of concrete,and bonding effects on chloride ion transport behavior.The results show that the freeze thaw cycle can promote chloride ion diffusion,and this promotion effect is significant when the number of freeze thaw cycles approaches the limit number of freeze thaw cycles.Furthermore,the mechanism of interfacial transition zone promoting chloride ion diffusion is revealed by simulating the diffusion trajectory of chloride ion in concrete meso-structure.Finally,through the simulation of the long-term diffusion performance of chloride ions,it is found that there is a saturated area of bound chloride ion near the ingress surface.And in the saturated area of bound chloride,the concrete loses the curing ability of free chloride and promotes chloride ion diffusion.关键词
氯离子扩散/冻融循环/氯盐侵蚀/混凝土细观结构/界面过渡区Key words
chloride ion diffusion/freeze-thaw cycle/chloride attack/concrete mesoscopic structure/interfacial transition zone分类
建筑与水利引用本文复制引用
梁秋群,陈宣东,胡祥..冻融循环下混凝土中氯离子传输机制细观模拟[J].硅酸盐通报,2024,43(6):2102-2110,9.基金项目
国家自然科学基金面上基金项目(12172121,U1934206) （12172121,U1934206）
广西高校中青年科研基础能力提升项目(2023KY0269) （2023KY0269）
