橡胶沥青零剪切粘度确定方法的研究

为了选择合理的指标来评价橡胶沥青的零剪切粘度，采用动态频率扫描试验、蠕变恢复试验以及重复蠕变试验对橡胶沥青零剪切粘度进行评价。同时，利用零剪切粘度来评价胶粉掺量对改性沥青高温性能的影响。试验结果表明：橡胶沥青零剪切粘度可以采用Carreau模型拟合，或者通过恢复阶段得到的零剪切粘度进行确定。同时，随胶粉掺量的不断增加，橡胶沥青的粘度也有较大程度增长，高温性能显著增加。

Research on Zero Shear Viscosity Determination Method of Rubber Asphalt

In order to establish a proper method for evaluating zero shear viscosity of Crumb Rub- ber Modified Asphalt （ CRMA）, dynamic frequency sweep test, creep recovery test and repeated creep tests were used to evaluate zero shear viscosity of CRMA. At the same time, the use of zero shear viscosi- ty to evaluate the impact of the crumb rubber content on high temperature performance. The experiment results show that： zero shear viscosity values fitted from dynamic loading based on Carreau model and from the recovery phase of creep recovery tests have a good correlation. With the continuous increase in the crumb rubber content, the high temperature performance of CRMA has a significant increase.