| 摘要: |
| 为了从细观本质上定量分析钢筋对混凝土中氯离子扩散的影响程度,通过开展人工模拟海洋潮汐环境干湿交替作用下混凝土和钢筋混凝土试件中氯离子自然扩散室内物理试验,得到不同扩散时间下试件中氯离子的含量分布.在此基础上,基于细观图像技术定量研究了钢筋间接阻挡效应对氯离子扩散系数的影响.以Fick第二扩散定律误差函数解析解为基础,通过引入钢筋的间接和直接阻挡效应系数来对其进行修正,建立了考虑钢筋阻挡效应的混凝土中氯离子含量预测模型.模型预测值与试验实测值吻合良好,验证了预测模型的正确性. |
| 关键词: 混凝土 钢筋 氯离子 阻挡效应 耐久性 |
| DOI：103969/j.issn.1007 9629202102010 |
| 分类号: |
| 基金项目:重庆市自然科学基金博士后科学基金项目（cstc2019jcyj bshX0063）；中国博士后科学基金面上资助项目（2019M653824XB）；重庆交通大学河海学院研究生科研创新基金项目（YC2020005） |
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| Prediction Model of Chloride Diffusion in Concrete Considering the Blocking Effects of Rebar |
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WU Linjian, JU Xueli, MA Yuanfei, GUAN Li
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National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing 400074, China
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| Abstract: |
| To quantify the influence degree of rebar on chloride diffusion in concrete at the meso scopic level, an indoor physical experiment of chloride natural diffusion into concrete and reinforced concrete specimens under drying wetting cycles in artificial marine tidal environment was carried out. The chloride content distributions in concretes at different diffusion times were measured. The influence of indirect blocking effects of rebar on chloride diffusion coefficient was quantitatively explored based on the meso scopic image technique. Using the indirect and direct blocking effect coefficients of rebar to improve the closed form solution of Ficks second law, a prediction model of chloride concentration in concrete considering the influence of blocking effects of rebar was established. The accuracy of the proposed model was proved by comparing the predicted chloride content in the model with experimental results. |
| Key words: concrete rebar chloride blocking effect durability |
