成型温度对旧SBS改性沥青混合料热再生性能的影响

以旧SBS改性沥青混合料为研究对象,通过室内试验,探究了20%、40%、70%、100%4种旧料掺量下成型温度对沥青混合料物理力学性能的影响以及较低成型温度下改善混合料性能的措施。结果表明:随着成型温度增大,旧SBS改性沥青混合料热再生性能得到不同程度改善;随着旧料掺量增加,混合料所需适宜成型温度随之增大,且成型温度对混合料密实性影响效果愈发显著;成型温度较低时建议采取控制旧沥青混合料掺量、适当增加粗集料含量、延长拌合时间的方法改善混合料性能,可使混合料达到较高成型温度时的性能状态,满足路用要求。

Influence of compaction temperature on the material regeneration performance of old SBS modified asphalt mixture

Based on the materials of old SBS modified asphalt mixture, the influences of compaction temperature on physical and mechanical properties of material regeneration performance under four normal RAP contents (20%, 40%, 70%, and 100%) and the mesures to improve performance of mixture under low compaction temperatures were investigated by laboratory tests. The results showed that, with the increase of compaction temperature, the regeneration performance of old SBS modified asphalt mixture was improved; with the increase of RAP (Recycled Asphalt Pavement), the required suitable compaction temperature increased, and the impacts of compaction temperature on compactness of mixture was more significant. It was suggested that the mesures of controlling RAP (Recycled Asphalt Pavement) content, increasing coarse aggregate content appropriately and extending mixing time could be applicated to improve the performance of mixture, in order to achieve the same performance as compacting under a high compaction temperature and to meet the requirements of road.