| 基于内部湿度试验的早龄期混凝土水分扩散系数求解 |
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| 引用本文： | 张君,侯东伟. 基于内部湿度试验的早龄期混凝土水分扩散系数求解[J]. 清华大学学报(自然科学版), 2008, 0(12) |
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| 作者姓名： | 张君 侯东伟 |
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| 作者单位： | 清华大学土木工程系;清华大学结构工程与振动教育部重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(50178043) |
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| 摘 要： | 为了求解干燥条件下混凝土内部水分分布,提出了一种早龄期混凝土水分扩散系数的求解方法。试验测定混凝土内部相对湿度随时间的变化,求解水汽扩散的非线性方程,获得了干燥过程中混凝土水分扩散系数与相对湿度(或水分含量)的数量关系。计算结果证明:水分扩散系数随含水量的增加而非线性增大;相对湿度90%以上时扩散系数随湿度变化显著,90%~40%时扩散系数随湿度变化趋缓,40%以下时基本不变。
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| 关 键 词： | 早龄期混凝土 扩散系数 相对湿度 含水量 |
Calculation of moisture diffusion coefficient in early age concrete from interior humidity tests |
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| ZHANG Jun,,HOU Dongwei. Calculation of moisture diffusion coefficient in early age concrete from interior humidity tests[J]. Journal of Tsinghua University(Science and Technology), 2008, 0(12) |
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| Authors: | ZHANG Jun HOU Dongwei |
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| Affiliation: | ZHANG Jun1,2,HOU Dongwei1(1.Department of Civil Engineering,Tsinghua University,Beijing 100084,China,2.Key Laboratory of Structural Engineering , Vibration of China Education Ministry,China) |
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| Abstract: | The moisture diffusion coefficient of early age concrete was calculated based on the experimental measurement of the variation of concrete interior humidity by solving the nonlinear diffusion equation to analyze the interior moisture content of concrete during drying.The results show that the moisture diffusion coefficient is strongly dependent on the moisture content.The diffusion coefficient increases with the moisture content.The moisture diffusion coefficient decreases rapidly with the relative humidity... |
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| Keywords: | early age concrete diffusion coefficient relative humidity moisture content |
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