混凝土中氯离子渗透的试验与细观数值分析
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TU528.01

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国家自然科学基金(51509084、51508162)


Experiment and mesoscopic numerical analysis of chloridion penetration in concrete
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    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。通过氯离子扩散系数快速测定RCM试验和压汞试验,分析了不同粗骨料含量、水胶比、孔隙率与氯离子扩散系数的关系;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的增加而增大,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大。

    Abstract:

    Using a combination of experimental research and numerical simulation, the effects of coarse aggregate content, interface area, and porosity on the permeability of chloridion in concrete were studied from a mesoscopic perspective.Firstly, through the RCM chloridion diffusion coefficient rapid determination test and mercury injection test, the relationship between different coarse aggregate content, water-binder ratio, porosity and chloride ionization diffusion coefficient was analyzed; then a program was established to build a concrete meso-random random aggregate model. Furthermore, the numerical simulation of chloridion diffusion performance was conducted, and the effects of meso-parameters such as coarse aggregate content and interface area on the permeation and diffusion of chloridion were analyzed.The results show that the numerical simulation is in good agreement with the test results, verifying the validity of the meso-scale numerical model; the chloridion diffusion coefficient decreases with increasing coarse aggregate content; the concrete porosity increases with increasing water-binder ratio, and further Increase the permeability of concrete; the permeability of concrete increases with the thickness of the interface zone and the diffusion coefficient of the interface zone.

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金立兵,王珍,王振清,张庆章,梁新亚.混凝土中氯离子渗透的试验与细观数值分析[J].土木与环境工程学报(中英文),2020,42(6):127-133.

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  • 收稿日期:2019-12-10
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  • 在线发布日期: 2020-11-26
  • 出版日期: 2020-12-31