Wang Wei, Chen Baomin, Shen Junan
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Jiangsu Provincial Center of Ecological Road Technology Industrialization and Research, Suzhou University of Science and Technology, Suzhou 215011, China.
Materials (Basel). 2022 Oct 11;15(20):7056. doi: 10.3390/ma15207056.
The viscosity of modified asphalt binders is the most important property to ensure the durability of open-graded friction course (OGFC). Zero shear viscosity (ZSV) is considered to be the optimum result to reflect the rutting characterization of high viscosity modified asphalt binders, compared with conventional vacuum capillary viscosity. However, there are few reports on using ZSV to evaluate the material characteristics of hybrid modified asphalt binders and to establish the relationship between ZSV and other properties. In this paper, a high viscosity hybrid modified asphalt binder was prepared with Sty-rene-butadiene-styrene (SBS) and Crumb rubber modifier (CRM). ZSV, three major indicators, 60 °C dynamic viscosity, 135 °C Brookfield viscosity, and a dynamic rheological test were used to determine the properties of the hybrid modified asphalt binders. The relationship between ZSV and other properties was studied by the gray correlation analysis method. Results indicated that: (1) The viscosity of hybrid modified asphalt binders increases with the decreasing frequency. When the frequency tends to 0, the viscosity of asphalt at this time is zero shear viscosity; (2) The values of the ZSV of hybrid modified asphalt binders have a large increase as the dose of both CRM and SBS modifiers were increased; and (3) The ZSV at 60 °C correlated well with the performance properties of rutting factor (G*/sin(θ)), indicating that the ZSV of hybrid modified asphalt binders could be a good indicator of performance.
改性沥青结合料的粘度是确保开级配摩擦层（OGFC）耐久性的最重要性能。与传统的真空毛细管粘度相比，零剪切粘度（ZSV）被认为是反映高粘度改性沥青结合料车辙特性的最佳结果。然而，关于使用ZSV来评估复合改性沥青结合料的材料特性以及建立ZSV与其他性能之间关系的报道很少。本文采用苯乙烯-丁二烯-苯乙烯（SBS）和橡胶粉改性剂（CRM）制备了高粘度复合改性沥青结合料。采用ZSV、60℃动态粘度、135℃布氏粘度这三个主要指标以及动态流变试验来测定复合改性沥青结合料的性能。通过灰色关联分析法研究了ZSV与其他性能之间的关系。结果表明：（1）复合改性沥青结合料的粘度随频率降低而增大。当频率趋于0时，此时沥青的粘度即为零剪切粘度；（2）随着CRM和SBS改性剂剂量的增加，复合改性沥青结合料的ZSV值大幅增加；（3）60℃时的ZSV与车辙因子（G*/sin(θ)）的性能特性相关性良好，表明复合改性沥青结合料的ZSV可以作为性能的良好指标。
