| 摘要: |
| 通过电热恒温鼓风干燥箱在60，80，105，120，150℃下分别对C20，C30，C40，C50这4个强度等级的混凝土进行干燥，分析其干燥速率、完全干燥所需时间和失水量等的变化规律.结果表明：在相同干燥温度下，混凝土强度等级越高，干燥速率越小，完全干燥所需时间越长，总失水量越少；相同强度等级混凝土在干燥时，干燥温度越高，干燥速率越大，完全干燥所需时间越短，总失水量越多；当干燥温度高于80℃时，混凝土中的结晶水开始失去，且干燥温度越高，结晶水失去越多；基于修正Page模型Ⅱ，考虑干燥温度和混凝土强度等级的影响，得到了适用于C20～C50混凝土在60～150℃下的干燥模型. |
| 关键词: 混凝土 加热干燥 脱水规律 干燥模型 |
| DOI：103969/j.issn1007 9629201806017 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划资助项目（2017YFC405101 2）;国家自然科学基金资助项目（51379178） |
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| Isothermal Drying and Dehydration of Concrete with Different Strength Grades |
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HAN Jinsheng1, LI Zongli1, ZHANG Guohui2, TAN Cong1, HAN Jinjia1
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1.College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100, China;2.Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
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| Abstract: |
| Concretes with different strength grades were dried in a thermostatic electric drier with forced convection at 60, 80, 105, 120, 150℃.The change of drying rate, completely drying time and amount of water loss were analyzed.The results show that under the same temperature, with the increase of concrete strength grade, the drying rate becomes smaller, the completely drying time becomes longer, and the total amount of water loss becomes less.With the same strength grade of concrete, the drying rate is higher, the completely drying time is less, and the total amount of water loss is more under higher drying temperature.When drying temperature is higher than 80℃, the crystal water begins to loss, and the higher drying temperature, the more crystal water loss.According to the modified Page model Ⅱ, a model of drying for C20C50 concrete at 60150℃ is established considering the effects of drying temperature and strength grade. |
| Key words: concrete heat drying dehydration rule drying model |
