用流变模型评价改性沥青及其混合料的高温性能

RHEOLOGICAL INDEXES ASSESS HIGH TEMPERATURE STABILITY OF ASPHALT BINDER AND ASPHALT MIXTURE

常规指标难以正确评价改性沥青的高温稳定性。本研究采用Ｂｕｒｇｅｒｓ流变模型将沥青及沥青混合料的弹性与粘性部分分开来评价改性沥青的高温稳定性。研究认为，沥青胶结料Ｂｕｒｇｅｒｓ模型中的η１及沥青混合料Ｂｕｒｇｅｒｓ模型中的η１与轮辙试验的动稳定度有很好的相关性，可以用来评价沥青及沥青混合料的高温稳定性。

Marshall stability and other present indexes are not suited to assess high temperature stability of asphalt binder and asphalt mixture.According to viscoelastic theories,Burgers model is selected to describe the viscoelastic behavior of asphalt.It is proved that η 1 of asphalt binder and asphalt mixture can be used to assess the high temperature stability and they have a good relationship with the DS of rutting test.