| 摘要: |
| 为改善现有氯离子扩散理论模型不能考虑计算期内大气温度、大气湿度随时间变化的不足，在Fick第二定律基础上，提出了一个计算氯离子在混凝土中扩散的新方法.该方法不但能考虑水灰比、龄期、温度、湿度、混凝土与氯离子结合能力的影响，而且能考虑混凝土结构服役期内大气温度和大气湿度的时变效应.通过与理论模型和有限差分法计算结果的对比，验证了该方法的正确性和有效性. |
| 关键词: 混凝土 氯离子 扩散系数 气候变化 |
| DOI：10.3969/j.issn.1007 9629.2013.05.007 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51278182）；广西科技开发计划项目（桂科攻1355008 9，桂科攻0816006 4）；广西重点实验室建设基金项目（11 CX 05） |
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| New Method to Calculate Chloride Ion Diffusion in Concrete underInfluences of Multiple Durability Factors |
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LIU Jun li, FANG Zhi
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School of Civil Engineering, Hunan University, Changsha 410082, China
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| Abstract: |
| Existing analytical chloride ion diffusion model can not be used to consider the time invitation effect of temperature and relative humidity in computation period. Based on the Ficks second law, a new method to calculate chloride ion diffusivity was established, which considers not only the influences of water cement ratio, time and chloride ion binding capacity of concrete, but also considers the time variant effect of temperature and humidity. The validity of the new model was verified through the comparison of results between the proposed method and the existing analytic/numerical model. The application scope of this method is wider than that of the analytical diffusion model. |
| Key words: concrete chloride ion diffusion coefficient climate change |
