基于流变学的RA改性沥青性能研究

摘要

将沥青组分(RA)从印度尼西亚布敦岩沥青(简称为 BRA)中抽提出来,作为基质沥青的改性剂。选取3个不同的掺配比例(10%,15%和20%),制备 RA改性沥青。采用 SHRP 试验,对改性沥青的高温性能、低温性能及粘温性能进行研究。分析结果表明：BRA 中的沥青组分是一种良好的天然改性剂。随着其掺量的增加,基质沥青的抗车辙因子和高温粘度均有所提高,高温性能和粘温性能均得到显著改善；低温时,蠕变劲度增大,蠕变劲度变化率变小,低温性能有所下降。因此,工程实际应用时,应兼顾沥青的高、低温及粘温性能,建议以基质沥青为基数,沥青组分的掺配比例不宜超过15%。%RA was extracted out from the BRA as the asphalt modifier.Three different blending proportion(10%,15%和 20%)are selected for the preparation of RA modified asphalt.SHRP test is used to study high-temperature properties,low temperature per-formance,viscosity-temperature properties of these modified asphalts.The results show that:RA bitumen component is a good natural modifiers,with the increase of its con-tent,the asphalt rutting factor,high temperature viscosity increase significantly and high-temperature performance and viscosity-temperature properties are improved,low creep stiffness increases,low temperature performance decreases.Therefore,during the practical application of engineering,both high pitch,low-temperature and viscosity-tem-perature performance should be considered,it is proposed that base asphalt as the base, the proportion of bitumen blending component should not exceed 15%.