改性沥青零剪切粘度的确定方法探究

零剪切粘度是改性沥青高温性能评价的重要指标。运用Burgers模型对通过蠕变恢复试验确定零剪切粘度ZSV的方法进行了研究,并与运用流变学模型Cross和Carreau进行参数拟合得到的ZSV进行对比,结果表明从恢复阶段得到的ZSV与Carreau模型的拟合结果非常接近,因此在直接测定ZSV比较困难的情况下,ZSV可以采用Carreau模型拟合或从蠕变恢复试验的恢复阶段进行确定。

Discussion on Method to Determine the Zero Shear Viscosity of Modified Asphalt

Zero Shear Viscosity is the important parameter to indicate the high temperature performance of modified asphalt.This paper studies the approach to determining ZSV by creep-recovery test and Burgers model.And several rheological models fitting results are compared such as Cross and Carreau models.The outcome shows that the ZSV obtained from recovery period of creep-recovery test is similar with Carreau model fitting result,which provides a reliable method to determine ZSV when experiment measurement becomes tough,e.g.for modified asphalt.