几种改性沥青粘弹性与高温性能的评价与分析  

The Evulation and Analysis of Several Modified Asphalt on Viscoelasticity and High Temperature Performance

作　　者：孙艳娜[1] 李立寒[1] 

机构地区：[1]同济大学道路与交通工程教育部重点试验室,上海201804

出　　处：《公路工程》2008年第4期79-83,共5页Highway Engineering

摘　　要：在不同的试验温度下,对热老化前后的Duroflex改性沥青、岩沥青改性沥青和SBS改性沥青进行动态剪切流变试验,采用相位角和车辙因子指标评价改性沥青的粘弹性特征、抗车辙能力以及温度敏感性。试验结果表明:Duroflex改性剂与岩沥青均可以增加沥青的高温弹性和抗车辙能力,改性效果随着改性剂掺量增加而增大,随着温度的升高而降低,经热老化后Duroflex改性沥青与岩沥青改性沥青的弹性特征增强、抗车辙能力提高;SBS改性沥青的弹性比例随着温度的升高而增大,经热老化后的弹性比例减小,但仍强于Duroflex改性沥青与岩沥青改性沥青;SBS改性沥青车辙因子对温度敏感性小于Duroflex改性沥青与岩沥青改性沥青。此外,采用现行Su-perpave胶结料分级标准,对SBS改性沥青的分级较为合适,而对Duroflex改性沥青和岩沥青改性沥青可能过于苛刻。The Duroflex modified asphalt.rock modified asphalt and SBS modified asphalt that both of before and after ageing are test at different temperature by use of dynamic shear rheological,using the index of phase angle and rute divisor to evaluate the viscoelasticity,rutting resistance performance and temperature susceptibility . The result confirm that： Duroflex modified asphalt and rock modified asphalt can improve the elatic and rutting resistance performance, and the effect increase as the modified additive increase and decrease as the temperature increase. After aging, both of the viscoelasticity and rutting resistance performance of Duroflex modified asphalt and rock modified asphalt can be enhanced ;The elastic of SBS modified asphalt increase as the temperature increase , and decrease after aging, hut still better than Duroflex modified asphalt and rock modified asphalt; The temperature susceptibility of rut division of SBS modified asphalt is smaller than that of Duroflex modified asphalt and rock modified asphalt. Futher more, the present superpave grading standard of asphalt binder is apply to SBS modified asphalt, but more sever to Duroflex modified asphalt and rock modified asphalt.

关 键 词：改性沥青 粘弹性 相位角 车辙因子 

分 类 号：U416.26[交通运输工程—道路与铁道工程]