中外公路2025，Vol.45Issue(4)：25-32,8.DOI:10.14048/j.issn.1671-2579.2025.04.004
带裂缝大掺量粉煤灰砂浆氯离子扩散行为研究
Study on Chloride Ion Diffusion Behavior in Cracked Cement Mortar with High Fly Ash Content
摘要
Abstract
In order to explore the diffusion behavior of chloride ions in cracked cement mortar with high fly ash(FA)content,this study fabricated cement mortar specimens with different FA contents and crack widths by artificially prefabricating cracks.The chloride ion content in cracks was measured after natural soaking for 30 days and 60 days.The results show that the cracks accelerate the diffusion of chloride ions in cement mortar.The increase in the diffusion coefficient caused by 0.05 mm and 0.1 mm cracks is similar,while that caused by a 0.2 mm crack is significantly higher.After 30 days of soaking,the chloride ion content of the FA50 group decreases significantly with increasing depth beyond 10 mm.After 60 days of soaking,the chloride ion content of all specimens decreases significantly with increasing depth.When the fly ash content is not more than 40%,the chloride ion resistance of the mortar improves with increasing FA content.However,at 50%FA content,the chloride ion resistance sharply decreases.The relationship between crack width and the chloride ion diffusion coefficient follows a linear function,while the relationship between fly ash content and chloride ion diffusion coefficient can be described by a cubic function.A diffusion coefficient model considering both fly ash content and crack width has been established,and the validity of the model is verified by comparison between experimental values and fitted values.关键词
裂缝宽度/大掺量粉煤灰/水泥砂浆/氯离子含量/氯离子扩散模型Key words
crack width/high fly ash content/cement mortar/chloride ion content/chloride ion diffusion model分类
交通工程引用本文复制引用
刘扬,毛晟哲,鲁乃唯..带裂缝大掺量粉煤灰砂浆氯离子扩散行为研究[J].中外公路,2025,45(4):25-32,8.基金项目
国家自然科学基金资助项目(编号:52178207) （编号:52178207）
