大坝混凝土内部相对湿度与孔隙水饱和度关系

为了研究大坝混凝土内部相对湿度100%和孔隙水饱和度100%是否具有唯一对应关系，成型了不同粉煤灰掺量（0、35%）的大坝二级配混凝土试件，通过温湿度传感器监测获得混凝土内部相对湿度，结合称重试验计算获得混凝土孔隙水饱和度。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始终为100%，然而对应的孔隙水饱和度并不一定为100%，不掺粉煤灰与掺35%粉煤灰的混凝土的孔隙水饱和度分别为85%~89%和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%。在绝湿状态下，水胶比0.5掺35%粉煤灰的混凝土的孔隙水饱和度要小于不掺粉煤灰的混凝土。

Relationship between internal relative humidity and pore water saturation of dam concrete

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 was 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.