| 摘要: |
| 通过自然渗透试验直观展现了氯离子在混凝土中的扩散过程,研究了试验过程中氯离子扩散系数的计算模型.结果表明:氯离子向混凝土内部扩散是物理化学综合作用的复杂过程,其扩散系数是与时间相关的函数,衰减系数与胶凝材料种类、水胶比和暴露环境有关;由模型Ⅱ得出,养护时间与浸泡时间对计算混凝土短期浸泡试验氯离子扩散系数的影响不能忽略,而对长期浸泡试验,即当浸泡时间远大于养护时间时,其影响可以忽略. |
| 关键词: 混凝土 氯离子扩散系数 计算模型 时变性 |
| DOI： |
| 分类号:TU528.01 |
| 基金项目:国家重点基础研究发展计划(973计划)资助项目，国家自然科学基金资助项目 |
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| Time variation of concrete chloride diffusion coefficients and applicability analysis of the calculation models |
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WU Ye1,ZHU Ya-xian2,LIU Jian-zhong1
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1(1.State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science,Nanjing 210008,China;2.Research Center on New Materials in Hydraulic Structures,Ministry of Water Resources,Nanjing Hydraulic Research Institute,Nanjing 210029,China)
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| Abstract: |
| Natural penetration tests intuitively show the chloride diffusing process in concrete.The calculation models for chloride diffusion coefficients are discussed in this paper.The analysis results show that: chloride diffusing into concrete is a complex process of physical and chemical effects,and the diffusion coefficients are the time-dependent functions,and the attenuation coefficients are related to cementitious materials,water cement ratio and exposure environment.According to model Ⅱ,for short term soaking experiment,the influence of a curing age and soaking time on the chloride diffusion coefficient calculation results cannot be neglected,whereas,for long term immersion experiment,namely when soaking time is far longer than the curing age,its influence can be neglected. |
| Key words: concrete chloride diffusion coefficient calculation model time variation |
