船闸三级配混凝土中氯离子传输行为的细观模拟研究  

Mesoscopic Simulation Study on Chloride Ion Transport Behavior in Ship Lock Three-Graded Concrete

作　　者：唐博文 丁平祥 张楠 梁梓豪 范志宏[1,2,3] TANG Bowen;DING Pingxiang;ZHANG Nan;LIANG Zihao;FAN Zhihong(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 500230,China;Key Laboratory of Harbor&Marine Structure Durability Technology,Ministry of Transport of PRC,Guangzhou 500230,China;Key Laboratory of Construction Materials,CCCC,Guangzhou 500230,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]中交四航工程研究院有限公司,广州500230 [2]水工构造物耐久性技术交通运输行业重点实验室,广州500230 [3]中交集团建筑材料重点实验室,广州500230 [4]河海大学港口海岸与近海工程学院,南京210098

出　　处：《硅酸盐通报》2025年第3期905-914,共10页Bulletin of the Chinese Ceramic Society

基　　金：中交集团科技研发项目(2023-ZJKJ-13)。

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。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 twograded 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 720,1800 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.

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 

分 类 号：TU528[建筑科学—建筑技术科学]