布敦岩沥青改性沥青高温动态流变性能研究  

A Research on Dynamic Rheology Properties of Buton Rock Asphalt Modified Asphalt Binder at High Temperature

作　　者：吕天华[1] 章毅[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200092

出　　处：《华东交通大学学报》2010年第4期13-17,21,共6页Journal of East China Jiaotong University

摘　　要：采用动态剪切流变仪对布敦岩沥青(BRA)改性沥青高温动态流变性能进行试验研究。结果表明,BRA改性沥青的温度敏感性随岩沥青掺量的增加而降低;岩沥青掺量达到20%时,BRA改性沥青的PG分级要高于基质沥青一个温度等级;掺量达到40%时,BRA改性沥青的车辙因子接近于SBS改性沥青;车辙试验结果与车辙因子关系表明岩沥青掺量的增多提高了沥青混合料的动稳定度,车辙因子适用于评价BRA改性沥青的高温性能。Dynamic rheology properties of Buton rock asphalt modified asphalt binder at high temperature are studied by means of dynamic shear rheometer. Results show that the temperature sensibility of BRA modified asphalt binder becomes lower and lower as the content of BRA increases; that the PG classification of BRA modified asphalt is higher than that of base asphalt when the admixture ratio of BRA reaches 20% ; that the rutting factor of BRA modified asphalt cement is close to that of SBS modified asphalt cement, when the admixture ratio of BRA reaches 40 %. The relationship between rutting factor and results of wheel track test shows that increase in asphalt content of asphalt mixtures can improve the dynamic stability and rutting factor is suitable to evaluate BRA high temperature properties.

关 键 词：道路工程 BRA改性沥青 高温流变特性 DSR PG分级 

分 类 号：U414[交通运输工程—道路与铁道工程]