混凝土中氯离子渗透的细观试验与数值分析
DOI:
作者:
作者单位:

河南工业大学

作者简介:

通讯作者:

中图分类号:

TU528.01

基金项目:

国家自然科学基金项目(51509084,51508162)


Meso-scale test and numerical analysis of chloride ion penetration in concrete
Author:
Affiliation:

Henan University of Technology

Fund Project:

Foundation items: National Nature Science Foundation of China (No. 51509084,51508162 )

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    采用试验研究与数值模拟相结合的方法,从细观角度研究了粗骨料含量、界面区和孔隙率等对混凝土中氯离子渗透性能的影响。首先通过RCM氯离子扩散系数快速测定试验和压汞试验,分析了不同粗骨料含量、水胶比、孔隙率与氯离扩散系数的关系;然后通过编写程序建立混凝土细观随机骨料模型,进而对氯离子的扩散性能进行数值模拟,分析了粗骨料含量和界面区等细观参数对氯离子渗透扩散的影响。结果表明:数值模拟与试验结果吻合性较好,验证了细观数值模型的有效性;氯离子扩散系数随粗骨料含量的增加而降低;混凝土孔隙率随水胶比增加而增大,进而增加混凝土的渗透性;混凝土的渗透性能随着界面区厚度和界面区扩散系数的增加而增加。

    Abstract:

    The effects of coarse aggregate content, interfacial zone and porosity on the chloride ion permeability of concrete were studied from a microscopic perspective by a combination of experimental research and numerical simulation. Firstly, the RCM chloride ion diffusion coefficient rapid determination test and mercury intrusion test were carried out, and the relationship between different coarse aggregate content, water-binder ratio, porosity and chlorine diffusion coefficient was analyzed. Then, the concrete meso-random aggregate model was established by programming. Furthermore, the numerical simulation of the diffusion performance of chloride ions was carried out, and the effects of coarse aggregate content and interface parameters on the permeation and diffusion of chloride ions were analyzed. The results show that the numerical simulation agreed well with the experimental results, and the validity of the meso-scale numerical model is verified. The chloride ion diffusion coefficient decreases with the increase of coarse aggregate content. The concrete porosity increased with the increase of water-to-binder ratio, and then increase the permeability of concrete. The permeability of concrete increased with the thickness of the interface zone and the diffusion coefficient of the interface zone.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-12-10
  • 最后修改日期:2020-01-17
  • 录用日期:2020-01-24
  • 在线发布日期:
  • 出版日期: