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- Title
再生混凝土抗氯离子渗透的五相细观数值模拟.
- Authors
金立兵; 余化龙; 王振清; 薛鹏飞; 吴强
- Abstract
Considering the heterogeneity of micro-structure of recycled aggregate concrete (RAC), a fivephase model was established, which included new and oid interfaee transition zones (ITZ), new mortar, oid adherent mortar, and natural aggregate・ Based on the Monte Carlo theory and MATLAB software platform, a real convex polygon coarse aggregate analysis model of RAC was developed. The experimental resuits were similar to the model calculation results, which proved that the five-phase convex aggregate model could better prediet the chloride permeation behavior in RAC. Furthermore, the influence of the characteristics of recycled aggregate concrete on chloride ion penetration was studied. The results showed that: when the content of recycled coarse aggregate (RCA) inereased from 0 to 50%, the chloride ion diffusion coefficient and diffusion depth inereasd by 102. 0% and 23. 9%, respectively. When the ITZ thiekness inereased from 25 |xm to 100 Rm, the chloride ion diffusion depth and diffusion coefficient inereased by 13% and 37. 0%, respectively. When the RCA content was large, the inerease of oid adherent mortar would significantly reduee the chloride ion permeability of RAC. When the bonding rate of oid mortar inereased from 0. 1 to 0. 4, and the chloride ion diffusion coefficient inereased by 18. 2%. New and oid ITZ and oid adherent mortar were the fundamental faetors affeeting the chloride penetration resistance of RAC.
- Publication
Journal of Zhengzhou University: Engineering Science, 2022, Vol 43, Issue 1, p83
- ISSN
1671-6833
- Publication type
Article
- DOI
10.13705/j.issn.1671-6833.2022.01.010