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针对多孔沥青混合料的大空隙结构及其高温多雨的应用环境,指出常规的高温稳定性或水稳定性等指标评价的单一性,进而提出评价其在水-高温综合作用下的路用性能。借助汉堡浸水车辙仪,对相同原材料、不同级配的多孔沥青混合料进行试验研究,并与AC-13改性沥青混合料和SMA-13的试验结果进行分析对比。结果表明,汉堡浸水车辙试验既考虑了水-高温综合作用对混合料影响,又考虑了长期荷载作用下的性能衰变,能够更实际的评价多孔沥青混合料的性能;材料级配设计合理的多孔沥青混合料水-高温综合性能良好,浸水汉堡最终变形仅为3.89mm,能够满足高温多雨环境下对路用性能要求;并且在原材料、空隙率相同的条件下,粗型骨架结构的多孔沥青混合料水-高温稳定性能更佳。
Aiming at the large void structure of porous asphalt mixture and its application environment of high temperature and raininess, the singleness of conventional high temperature stability or water stability index is pointed out, and then the road performance under combined action of water and high temperature is proposed. With the Hamburg flooding rutting instrument, the same raw materials, different grade porous asphalt mixtures were tested and compared with AC-13 modified asphalt mixture and SMA-13 test results. The results show that the rutting test of Hamburg flooding not only considers the effect of water-high temperature on the mixture, but also takes into account the decay of performance under long-term load, which can more effectively evaluate the performance of porous asphalt mixture. Asphalt mixture water - good comprehensive performance at high temperature, immersion Hamburg final deformation of only 3.89mm, to meet the high temperature and rainy environment on the road performance requirements; and raw materials, the same porosity under the conditions of coarse skeleton porous Pitch Mix Material water - high temperature stability better.