温度和剪切速率对Sasobit改性沥青粘度影响研究  

Effects of Temperature and Shear Rate on Viscosity of Sasobit Modified Asphalt

作　　者：公晋芳[1] 贾鹏 

机构地区：[1]许昌职业技术学院,河南许昌461000 [2]许昌市公路管理局第二工程处,河南许昌461000

出　　处：《公路工程》2015年第5期261-264,共4页Highway Engineering

摘　　要：该研究中,在28-130℃温度范围,间隔6℃测量动态粘度（η’）。从粘度分析中可得出以下结论：对Sasobit改性沥青存在一个临界温度,在临界温度之上Sasobit降低粘度;在临界温度之下Sasobit增加粘度。此外,在0.002 5-250 s^-1剪切速率范围内,分析了掺加及未参加Sasobit沥青的稳态剪切黏度对剪切速率的依赖性。掺加Sasobit后,在64℃下PG64-22沥青变为剪切变稀型流体。剪切速率依赖性随着Sasobit掺量的增加而增加。在100℃下观察到了Sasobit相似的效果。对PG76-22M沥青,在所有3个温度下,随着Sasobit掺量增加,剪切速率依赖性增加。这表明,如果现场实际的剪切速率高于粘度测量所使用的剪切速率,目前正使用的拌和及压实温度可能较低。In this study,dynamic viscosity was measured at temperature ranges from 28 ℃ to 130℃ at 6 ℃ interval.From viscosity analyses it can be concluded that there exists a critical temperature for a Sasobit modified asphalt such that above the critical temperature Sasobit reduces the viscosity and below that temperature Sasobit increases the viscosity.Also,the shear rate dependency of steady state viscosity of asphalt binders with and without Sasobit was analyzed in this study with in the range of 0.002 5 /s to 250 /s.With the addition of Sasobit,PG 64 -22 at 64 ℃ becomes a shear-thinning liquid.The shear rate dependency increases with an increase in percent of Sasobit.Similar effects of Sasobit are observed at 100℃ in reduced level and shear rate dependency with the addition of Sasobit is almost negligible at 124 ℃.Also,the rate of change of viscosity is higher at higher shear rates and lower at lower shear rates.

关 键 词：改性沥青 SASOBIT 粘度 温度 剪切速率 

分 类 号：U414.1[交通运输工程—道路与铁道工程]