摘要
为了深入了解各因素对高模量改性沥青流变性能的影响,采用DSR实测的方法,对不同温度、荷载频率及应变下70#基质沥青和高模量改性沥青的流变性能进行了系统的研究,并对比了两种沥青中、低温时的抗疲劳性能。试验结果表明:高模量改性沥青温度敏感性较低,随着温度的升高,其抗车辙因子G*/sinδ较基质沥青的下降幅度要小得多;两种沥青的G*/sinδ随着荷载频率的降低而降低,高模量沥青在高温、低频时的G*/sinδ显著高于基质沥青的;50℃条件下,基质沥青的G*/sinδ随着应变的增大而降低,高模量沥青的G*/sinδ则保持不变;70℃条件下,高模量沥青的G*/sinδ随着应变的增大而降低。两种沥青的G*sinδ随着温度的降低而增大,达到相同抗疲劳性能时,高模量沥青的温度更低。
To get a grip on the influence of different factors on rheological properties of high modulus asphalt,the method of DSR measurement is made in a systematic study of different temperatures,loading frequency, strain 70^# base asphalt and rheological properties of high modulus asphalt, and their anti-fatigue performance are compared.The experimental results show that high-modulus asphalt has a low sensitivity to temperature. Compared with the base asphalt, the high-modulus modified asphalt＇s G^＊/sin δ will have a slower decrease under the condition of temperature increase. Both asphalt＇s G^＊/sin δ would decrease with the decrease of load frequency, high-modules asphalt has a higher G^＊/sinδ than base asphalt especially at the higher temperature and lower frequency.At 50 ℃ ,base asphalt G^＊/sin δ would decrease with the strain＇s increase,while the high-modulus asphalt＇s G^＊/sin δ would keep steady.But at 70℃ ,high-modulus asphalt＇s G^＊/sinδ would decrease with the strain＇s increase. G^＊ sin δ of two kinds of as phalt increases with the decrease of temperature, reached the same fatigue resistance, high modulus asphalt temperature was decreased.
出处
《交通科学与工程》
2014年第1期22-27,38,共7页
Journal of Transport Science and Engineering
基金
湖南省科技计划项目(2011FJ3176)
公路工程教育部重点实验室开放基金资助项目(KFJ090108)
关键词
高模量改性沥青
流变性能
抗车辙能力
影响因素
DSR
high modulus asphalt
rheological property
DSR
rutting resistance
factors
