Study on Chloride Ion Diffusion Behavior in Cracked Cement Mortar with High Fly Ash Content

Authors

LIU Yang, School of Civil and Environmental Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , ChinaFollow
MAO Shengzhe, School of Civil and Environmental Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , ChinaFollow
LU Naiwei, School of Civil and Environmental Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China

Corresponding Author

毛晟哲，男，硕士研究生.E-mail：1348101941@qq.com

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 FA 50 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.

Publication Date

8-15-2025

DOI

10.14048/j.issn.1671-2579.2025.04.004

First Page

25

Last Page

32

Submission Date

August 2025

Recommended Citation

Yang, LIU; Shengzhe, MAO; and Naiwei, LU (2025) "Study on Chloride Ion Diffusion Behavior in Cracked Cement Mortar with High Fly Ash Content," Journal of China & Foreign Highway: Vol. 45: Iss. 4, Article 4.
DOI: 10.14048/j.issn.1671-2579.2025.04.004
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss4/4

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