| 摘要: |
| 针对大坝混凝土内部相对湿度100%和孔隙水饱和度100%的相关性问题,成型了0.5水胶比、不同粉煤灰掺量(0%、35%)的大坝二级配混凝土试件,首先通过温湿度传感器监测获得混凝土试件内部相对湿度,然后称取混凝土样品在绝湿状态、饱和状态以及干燥状态下的质量,最后计算得到孔隙水饱和度,并分析其与混凝土内部相对湿度的关系。结果表明,绝湿状态下,水胶比0.5的大坝混凝土内部相对湿度一直保持为100%,不掺粉煤灰的混凝土的孔隙水饱和度为85%~89%,掺35%粉煤灰的混凝土的孔隙水饱和度为73%~76%。即大坝混凝土孔隙水饱和度100%对应于内部相对湿度100%,而内部相对湿度100%不是唯一对应孔隙水饱和度100%。此外,绝湿状态下掺35%粉煤灰的混凝土,其孔隙水饱和度要小于不掺粉煤灰的混凝土。 |
| 关键词: 大坝混凝土 内部相对湿度 孔隙水饱和度 粉煤灰掺量 |
| DOI： |
| 分类号:TV431 |
| 基金项目:流域水循环模拟与调控国家重点实验室开放基金(No.IWHR-SKL-201917)，国家自然科学基金资助项目(No.51779130) |
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| Relationship between internal relative humidity and pore water saturation of dam concrete |
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Fei Dawei1, Huang Yaoying1, Ding Qian1, Xia Shifa2, Bao Tengfei3
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1.College of Hydraulic Environmental Engineering,China Three Gorges University,Hubei,Yichang;2.China Institute of Water Resources and Hydropower Research;3.College of Water Conservancy and Hydropower Engineering,Hohai University
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| Abstract: |
| In order to investigate whether there is a unique correspondence between the relative humidity of 100% inside dam concrete and the pore water saturation of 100%, dam secondary concrete specimens with a water-binder ratio of 0.5 and different fly ash contents (0%, 35%) were formed. The relative humidity inside the concrete specimens was monitored by temperature and humidity sensors and the pore water saturation of the concrete was calculated using a weighing test. The results show that the relative humidity inside the dam concrete with a water-binder ratio of 0.5 was kept at 100% in the insulation humidity state. However, the corresponding pore water saturation is not necessarily 100%; the pore water saturation of concrete without fly ash and with 35% fly ash was 85~89% and 73~76%, respectively. This indicates that 100% of the pore water saturation of the dam concrete corresponds to 100% of the internal relative humidity, and the internal relative humidity of 100% is not the only relative humidity corresponding to the pore water saturation of 100%. In the insulation humidity state, for concrete with a water-binder ratio of 0.5, the pore water saturation of concrete with 35% fly ash is less than that of concrete without fly ash. |
| Key words: dam concrete internal relative humidity pore water saturation fly ash content |
