Mesoscopic numerical simulation on chloride diffusion in concrete with random distributed recycled coarse aggregate

被引：5
作者：
Xiao, Jianzhuang [1 ]
Lu, Deng [1 ]
Ma, Zhiming [1 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2014年 / 44卷 / 06期
关键词：
Chloride diffusion; Mesoscopic numerical simulation; Random distribution; Recycled aggregate concrete (RAC); Recycled coarse aggregate (RCA);
D O I：
10.3969/j.issn.1001-0505.2014.06.026
中图分类号：
学科分类号：
摘要：
Concerning the effects of the random distribution of coarse aggregate and the non-linear characteristic of chloride binding on chloride diffusion, the modeling and microscopic simulation analysis for the chloride diffusion characteristics of recycled aggregate concrete (RAC) are carried out. The simulation results are compared with the test results. Then, the chloride diffusion characteristics with different diffusion coefficients of old mortar, new mortar and old interfacial transition zone (ITZ) and different immersion times are studied. The results indicate that the simulation results and the test results are similar. The distribution of chloride diffusion in RAC declines wavily along the diffusion depth. The chloride diffusion speed accelerates with the increase of the diffusion coefficients and the immersion time. Besides, with the increase of the replacement percentage of recycled coarse aggregate (RCA), the chloride diffusion speed of RAC increases. At the same diffusion depth, the maximum chloride concentrations in different random RAC models are similar, indicating that the simulation results of the proposed random RAC model has a good stability. ©, 2014, Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition). All right reserved.
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页码：1240 / 1245
页数：5
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