【摘要】 为了探究温拌沥青混合料(WMA)及其结合料短期老化后的水稳定性,制备了Evotherm温拌沥青混合料(Evotherm-WMA),并将其放置于烘箱中进行3种时间(2,4,8 h)与温度(112℃、129℃、146℃)组合条件下的短期老化。采用浸水马歇尔试验和冻融劈裂试验研究了Evotherm-WMA经过不同条件老化后的水稳定性;同时,采用躺滴法检测了经过短期老化后的Evotherm-WMA中提取的沥青结合料与3种测试液体的接触角,得到了老化沥青结合料的表面能。结果表明:EvothermWMA成型初期的水稳定性比热拌沥青混合料(HMA)差;经过一定的老化时间与老化温度后的Evotherm-WMA的水稳定性可以达到或超过HMA;Evotherm温拌沥青结合料的表面能随着老化时间与温度的增加而增加;Evotherm-WMA的浸水马歇尔残留稳定度与其结合料的表面能有较强的线性相关性。更多还原

【Abstract】 To explore Evotherm warm mix-asphalt( Evotherm-WMA) and the moisture susceptibility of asphalt mixtures under a short-term aging process,WMA was coordinated in the laboratory at three shortterm aging temperatures( 112 ℃,129 ℃ and 146 ℃) and aging time( 2 h,4 h and 8 h). The moisture susceptibility of Evotherm-WMA was measured through immersed Marshall test and freeze-thaw splitting test. In addition,the contact angles of asphalt binder as well as probe liquids extracted from Evotherm-WMA mixtures after a short-term aging were measured by the sessile drop method. And the surface free energy( SFE) of asphalt binders was calculated. The results show that the moisture susceptibility of Evotherm-WMA is poorer than that of hot mix asphalt( HMA) at the initial stage of forming. The moisture susceptibility of the Evotherm-WMA and warm mix binders will be improved or atthe same level as the moisture susceptibility of HMA if they are coordinated at certain aging temperature and time. The SFE of asphalt binders extracted from Evotherm-WMA increases with the increase of the coordinated aging time and temperature. Furthermore, there is certain linear correlation between immersed Marshall residual stability of Evotherm-WMA and SFE of asphalt binders.更多还原