沥青混合料试件吸水饱和度对水稳定性影响

Effect of Moisture Saturation of Asphalt Mixture to Moisture Damage

改变不同空隙率试件浸水时间及温度后测定试件吸水饱和度,研究了浸水时间、水温及空隙率对吸水饱和度的影响规律。结果表明,浸水时间对试件吸水饱和度有显著影响;水温对吸水饱和度有较大影响,相同空隙率试件吸水饱和度随着温度的升高而增加;提出了浸水饱和残留稳定度作为水稳定性判断指标。现行试验规程规定采用统一浸水时间的试验条件值得商榷,建议根据实际情况调整浸水时间以保证试件达到浸水饱和状态。

Based on moisture saturation level tests under different percentages of air voids with asphalt mixture, an analysis is made of the influence of soaked period, water temperature and air void content on the level of moisture saturation. The results indicate that soaking period had an effect on the moisture saturation level. In all cases of similar air void content, the moisture saturation degree increases with the rise of water temperature. The Retained Marshall Stability Ratio in Immersion Saturated State （RRISS） after the absorption test is used as an indication of sensitivity of the compacted mixture to moisture damage for the first time. It is questionable to adopt a specific soaking period in present Specification; it is also suggested that the optimal period of soaking time be variable according to the field data.