船闸三级配混凝土中氯离子传输行为的细观模拟研究

摘要/Abstract

摘要： 针对船闸工程中采用湿筛二级配混凝土表征三级配混凝土氯离子扩散系数所产生的较大偏差问题,建立了湿筛二级配混凝土和三级配混凝土的氯离子扩散模型。在此基础上,探讨了界面过渡区(ITZ)厚度、粗骨料体积分数等对三级配混凝土氯离子传输行为的影响。此外,还对比分析了湿筛二级配混凝土与三级配混凝土的氯离子扩散行为及耐久性寿命预测结果的差异。模拟结果表明:随着粗骨料体积分数及ITZ厚度的增大,三级配混凝土的氯离子扩散系数显著降低;在骨料的稀释效应、曲折效应和ITZ效应中,ITZ效应起主导作用。此外,湿筛二级配混凝土在侵蚀720、1 800 d时的氯离子扩散系数为三级配混凝土的1.77、1.86倍。采用湿筛二级配混凝土替代三级配混凝土进行寿命预测时,评估结果存在低估的风险。

关键词: 三级配混凝土, 湿筛二级配混凝土, 氯离子扩散系数, 界面过渡区, 寿命预测, 耐久性

Abstract: To address the significant deviation in using wet-sieved two-graded concrete to represent the chloride ion diffusion coefficient of three-graded concrete in ship lock engineering, chloride ion diffusion models for both wet-sieved two-graded concrete and three-graded concrete were established. On this basis, the effects of interfacial transition zone (ITZ) thickness and coarse aggregate volume fraction on the chloride ion transport behavior in three-graded concrete were explored. Additionally, a comparative analysis was conducted on the differences in chloride ion diffusion behavior and durability life prediction between wet-sieved two-graded concrete and three-graded concrete. Simulation results indicate that the chloride ion diffusion coefficient of three-graded concrete decreases significantly with increasing coarse aggregate volume fraction and ITZ thickness. Among the aggregate dilution effect, aggregate tortuosity effect, and ITZ effect, the ITZ effect plays a dominant role. Furthermore, the chloride ion diffusion coefficient of wet-sieved two-graded concrete during 720, 1 800 d of corrosion is 1.77, 1.86 times that of three-graded concrete. And using wet-sieved two-graded concrete to represent three-graded concrete for life prediction may lead to underestimated evaluation results.

Key words: three-graded concrete, wet-sieved two-graded concrete, chloride ion diffusion coefficient, interfacial transition zone, service life prediction, durability

中图分类号:

TU528

唐博文, 丁平祥, 张楠, 梁梓豪, 范志宏. 船闸三级配混凝土中氯离子传输行为的细观模拟研究[J]. 硅酸盐通报, 2025, 44(3): 905-914.

TANG Bowen, DING Pingxiang, ZHANG Nan, LIANG Zihao, FAN Zhihong. Mesoscopic Simulation Study on Chloride Ion Transport Behavior in Ship Lock Three-Graded Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 905-914.

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