摘要
以5种石油沥青为原料,以车辙试验作为评价高温路用性能的基准,考察了软化点、60℃黏度、动态剪切和重复蠕变试验,表征沥青高温路用性能的准确性和有效性。通过关联和比较表明,软化点在表征沥青高温性能时具有一定的局限性,当两沥青软化点差小于1.0℃,软化点的高低不能反应沥青的高温性能。由于5种沥青黏度相差较大,试验仅得出当两沥青黏度差大于平均值的7.56%时,黏度大小可以表征沥青高温性能。动态剪切试验可以很好地对沥青进行不同温度等级的划分,对于同一温度等级的沥青而言,可以采用重复蠕变试验进行评价,动态剪切和重复蠕变试验的联合应用,可以准确有效地评价沥青的高温路用性能。
Taking the five kinds of petroleum asphalt as material and the results of rutting test as standard,this paper studied the correctness and accuracy of softening point,viscosity at 60 ℃,dynamic shear rheometer and multiple stress creep recovery characterizing with asphalt pavement high temperature properties. The correlating and comparing results showed that softening point had certain limitation in the characterization of asphalt high .temperature properties, if the softening point was differ by less than 1.0 ℃, softening point would not characterize the high temperature properties of asphalt accurately. As the difference of five asphalt viscosities was relatively large,the paper only obtained when the differ of viscosities was over 7.56% of average value,the viscosity can characterize the high temperature properties of asphalt. Analysis by dynamic shearing rheometer, the results were very good at distinguishing the temperature rating of asphalt belongs to. But for the asphalt belongs to the same temperature rating, multiple stress creep recovery test should be used to evaluate the high temperature properties of asphalt. The combination use of dynamic shear rheometer and multiple stress creep recovery can evaluate the high temperature properties of asphalt accurately and effectively.
出处
《新型建筑材料》
北大核心
2011年第6期65-68,共4页
New Building Materials
关键词
沥青
高温指标
路用性能
重复蠕变
asphalt：high temperature indices：pavement properties
multiple stress creep recovery
