[1]金立兵,余化龙,王振清,等.再生混凝土抗氯离子渗透的五相细观数值模拟[J].郑州大学学报(工学版),2022,43(01):83-89.[doi:10.13705/j.issn.1671-6833.2022.01.010]
　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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再生混凝土抗氯离子渗透的五相细观数值模拟()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年01期
页码:
83-89
栏目:
出版日期:
2022-01-09

文章信息/Info

Title:
Five-phase Mesoscopic Numerical Simulation of Chloride Permeation Resistance in Recycled Aggregate Concrete
作者:
金立兵; 余化龙; 王振清; 薛鹏飞; 吴强
河南工业大学土木工程学院;河南工大设计研究院;

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
关键词:
Keywords:
recycled aggregate concrete;  durability;  random convex polygon aggregate;  chloride ion;  numerical simulation
分类号:
TU528.1
DOI:
10.13705/j.issn.1671-6833.2022.01.010
文献标志码:
A
摘要:
考虑到再生混凝土微细观结构的非均质性，建立了包括新、旧界面过渡区、新砂浆、旧粘结砂浆和天然骨料的再生混凝土五相模型。基于Monte-Carlo理论借助Matlab软件平台开发真实再生混凝土凸多边形粗骨料分析模型，研究了再生骨料混凝土特性因子对氯离子渗透的影响。试验结果与模型计算结果相近，证明五相凸骨料细观模型能较好的预测再生混凝土中氯离子的渗透行为。研究结果表明：在高掺量的再生粗骨料含量下，氯离子渗透行为包括扩散系数和扩散深度的增大，这取决于界面过渡区和旧粘结砂浆随再生粗骨料含量的增加而增大；新、旧界面过渡区和旧粘结砂浆是导致再生混凝土抗氯离子渗透能力弱的根本原因。
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.

参考文献/References:

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更新日期/Last Update: 2022-01-09