大孔隙基体沥青混合料性能影响因素研究

Study on Influencing Factors of Performance of Asphalt Mixture with Macroporous Matrix

大孔隙基体沥青混合料作为灌注式半柔性路面结构的骨架,对灌注式半柔性路面混合料性能起到至关重要的作用。本论文通过对比研究不同级配类型的嵌挤结构、不同的击实功、不同类型外加剂等因素对大孔隙基体沥青混合料性能的影响规律,试验结果表明掺加适量5~10 mm集料的级配嵌挤结构整体性能更优,掺加0.3%聚酯纤维与0.2%高黏剂,单面击实75次,此时大孔隙基体沥青混合料肯塔堡飞散试验结果最小,马歇尔稳定度最大,连通孔隙率与灌注率都能满足规范要求,大孔隙基体沥青混合料性能最优。

As the skeleton of semi flexible pavement structure, asphalt mixture with macroporous matrix plays an important role in the performance of semi flexible pavement mixture. In this paper, the influence of different gradation types of embedded structure, different compaction work, different types of admixtures on the performance of macro porous matrix asphalt mixture is studied. The test results show that the overall performance of the graded embedded structure with appropriate amount of 5~10 mm aggregate is better. When 0.3% polyester fiber and 0.2% high viscosity agent are added and one side is compacted for 75 times, the performance of macro porous matrix asphalt mixture is better. The results of Kentucky dispersion test are the smallest, Marshall stability is the largest, the connected porosity and filling rate can meet the requirements of the specification, and the performance of macroporous matrix asphalt mixture is the best.