矿粉对橡胶沥青混合料路用性能的影响

Influence of Mineral Fillers on Performance of Asphalt Rubber Mixtures

基于橡胶沥青混合料,计算得到5.0%,6.0%,6.5%等3种沥青用量下沥青膜厚度,分析了矿粉对橡胶沥青混合料沥青膜厚度的影响。通过肯塔堡飞散试验、冻融劈裂试验及四点弯曲疲劳试验,对比试验了加矿粉和不用矿粉的橡胶沥青混合料的黏结性能、抗水损害性能、疲劳性能,试验结果表明:掺加矿粉的橡胶沥青混合料的飞散损失均略低于不用矿粉的混合料;6.0%,6.5%沥青用量下,不用矿粉的级配对应的TSR值均小于加矿粉的级配;不用矿粉的级配疲劳性能明显优于使用矿粉的两种级配。研究表明:橡胶沥青混合料中使用矿粉,可略提高其黏结性能和抗水损害性能,但对于其疲劳性能却是不利的。

Based on the asphalt rubber mixtures,the asphalt film thickness in 5. 0%,6. 0% and 6. 5% asphalt content was obtained by calculation. The impact of mineral fillers on the performance of asphalt rubber mixtures was analyzed. Cantabro test,moisture damage resistance test and flexural fatigue test at 4 points were carried out in laboratory to identify the performance differences between mixtures with and without mineral fillers,including the bonding performance,water damage resistant performance and fatigue performance. The test results indicate that Cantabro loss of mixtures with mineral fillers is less than that of mixtures without mineral fillers. And when the asphalt content is 6% and 6. 5% in asphalt mixtures,tensile strength ratio（ TSR） of mixtures with mineral fillers is lower than the mixtures without mineral fillers. However,fatigue results show that the fatigue performance of mixtures without mineral fillers is obviously better than that of mixtures with mineral fillers. It is concluded that the use of mineral fillers in asphalt rubber mixtures decreases the fatigue resistance,but increases the bond performance and water damage resistance slightly.