PPASBS复合改性沥青高温性能试验研究

摘要

In order to study the high temperature performance of different proportion of PPA and SBS compound modified asphalt binder,the three index test of asphalt and dynamic shear rheometer test (DSR) were conducted,and then compared the performance of composite asphalt with SBS modified asphalt.The experimental results show that thehigh temperatureperformance of different dosage of PPA&SBS composite modified asphalt fallwith the rise of temperature,and the high temperature performance about different dosage of PPA and SBS are similar,the reduce trend of high temperature performance about one same asphalt are placid after more than 52 ℃;In the two kinds of composite modified asphalt-SBS2.0 ％ + PPA0.5％ and SBS3.0 ％ + PPA1.0 ％,SBS2.0 ％ + PPA0.5％,the most close to the SBS4.0 ％ only modified asphalt in high temperature performance,with the consideration of road performance and cost performance comprehensive,could be.a substitute of SBS4.0 ％ only modified asphaltin the condition of meet the technical requirements.%为了研究不同掺量PPA和SBS复合改性沥青结合料高温性能,进行沥青三大指标试验以及动态剪切流变试验(DSR),并将复合改性沥青性能与SBS改性沥青进行对比.实验结果表明:不同掺量的PPA&SBS复合改性沥青高温性能均随温度升高而下降,且在温度大于52℃以后不同沥青高温性能相差不大,同种沥青高温性能降低趋于平缓;SBS2.0％+ PPA0.5％和SBS3.0％+ PPA1.0％两种复合改性沥青中,综合考虑路用性能及性价比后,高温性能最接近于SBS4.0％单独改性沥青的是SBS2.0％+ PPA0.5％复合改性沥青,可在满足技术要求的前提下作为SBS4.0％单独改性沥青的替代.