| 黄达海,刘光廷.混凝土等温传湿过程的试验研究[J].水利学报,2002,33(6):0096-0101 |
| 混凝土等温传湿过程的试验研究 |
| Experimental study on moisture transfter in concrete under quasi-isothermal condition |
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| DOI： |
| 中文关键词: 混凝土 相对湿度 Boltzmamn变量 质扩散系数 |
| 英文关键词: conventional concrete RCC relative humidity Boltzmamn variable moisture diffusivity |
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| 摘要点击次数: 2191 |
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| 中文摘要: |
| 利用400mm×400mm×160mm块状试件，构造了混凝土内部湿分迁移的半无限平面模型.在等温环境下，测量了第一饱和状态下混凝土向非饱和空气介质传湿的全过程.利用Boltzmamn变量η，导出了混凝土湿度控制方程的常微分形式，并将其中的质扩散系数Dm表示为显函数，便于试验确定.研究表明：Boltzmamn变量与混凝土的相对湿度H具有良好的规律性，η～H可以用四次多项式拟合；混凝土的质扩散系数严重地依赖于当前状态下的相对湿度H，且均可以用三次多项式表达；在同一湿度条件下，碾压混凝土的质扩散系数为常态混凝土的4～12倍.研究成果可为混凝土表面保护与抗裂设计提供参考. |
| 英文摘要: |
| The transfer of moisture in conventional concrete and RCC is studied experimentally. The specimens used are in dimensions of 400mm×400mm×160mm. The procedure of moisture in saturated concrete transfer into unsaturated atmospheric media is recorded. Based on Boltzmamn transform, a formal differential equation controlling the moisture transfer is deduced. The moisture diffusivity can be expressed in distinct function form, so that it can be determined by experiment. The experimental result shows that good relationship exists between the Boltzmamn variable and relative humidity of concrete. The diffusivity of RCC is found to be 4-12 times higher than that of conventional concrete under the same humidity condition. |
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