Five-phase Mesoscopic Numerical Simulation of Chloride Permeation Resistance in Recycled Aggregate Concrete

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Five-phase Mesoscopic Numerical Simulation of Chloride Permeation Resistance in Recycled Aggregate Concrete

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[1]JIN Libing,YU Hualong,WANG Zhenqing,et al.Five-phase Mesoscopic Numerical Simulation of Chloride Permeation Resistance in Recycled Aggregate Concrete[J].Journal of Zhengzhou University (Engineering Science),2022,43(01):83-89.[doi:10.13705/j.issn.1671-6833.2022.01.010]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43 Number of periods: 2022 01 Page number: 83-89 Column: Public date: 2022-01-09

Title:: Five-phase Mesoscopic Numerical Simulation of Chloride Permeation Resistance in Recycled Aggregate Concrete

Author(s):: JIN Libing¹; YU Hualong¹; WANG Zhenqing¹; 2; XUE Pengfei¹; WU Qiang²; 1.School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China;
2.Design and Research Academy, Henan University of Technology, Zhengzhou 450001, China

Keywords:: recycled aggregate concrete; durability; random convex polygon aggregate; chloride ion; numerical simulation

CLC:: TU528.1

DOI:: 10.13705/j.issn.1671-6833.2022.01.010

Abstract:: Considering the heterogeneity of micro-structure of recycled aggregate concrete (RAC), a five-phase model was established, which included new and old interface transition zones (ITZ), new mortar, old 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 results were simi-lar to the model calculation results, which proved that the five-phase convex aggregate model could better predict 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) increased from 0 to 50%, the chloride ion diffusion coefficient and diffusion depth increasd by 102.0% and 23.9%, respectively. When the ITZ thickness increased from 25 μm to 100 μm, the chloride ion diffusion depth and diffusion coefficient increased by 13% and 37.0%, respectively. When the RCA content was large, the increase of old adherent mortar would significantly reduce the chloride ion permeability of RAC. When the bonding rate of old mortar increased from 0.1 to 0.4, and the chloride ion diffusion coefficient increased by 18.2%. New and old ITZ and old adherent mortar were the fundamental factors affec-ting the chloride penetration resistance of RAC.

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Last Update: 2022-01-09