脱硫橡胶沥青改性剂制备及改性沥青性能研究

Study on Preparation of Modifier for Desulfurized Rubber Asphalt and Performance of Modified Asphalt

采用双螺杆挤出法对胶粉进行脱硫降解,通过正交试验得到脱硫橡胶改性沥青改性剂制备工艺关键参数;通过三大指标及高温剪切流变试验,分析脱硫橡胶改性沥青高低温性能;并掺加SBS探究其对脱硫橡胶改性沥青性能的影响。结果表明:改性剂制备工艺参数为裂解催化剂2.6%、酸化油30.0%、挤出温度290℃;脱硫橡胶沥青改性剂掺量对改性沥青高低温性能影响显著,最优掺量为20.0%时,改性沥青软化点及5℃延度均显著增大,同时黏度较低,工作性能良好;脱硫橡胶可提高改性沥青的复数模量和车辙因子,降低相位角,改善沥青的高温抗变形能力;SBS的掺入提高了脱硫橡胶改性沥青的软化点和延度,改善了改性沥青的短期抗老化性能和弹性恢复性能。

Rubber powder was desulfurized and degraded by means of twin-screw extrusion.The key parameters of the preparation process of the modifier for desulfurized rubber-modified asphalt were obtained by orthogonal test.And then the high-and low-temperature performance of the modified asphalt were analyzed by the three indexes and high temperature shear rheological test,furthermore.SBS was added to explore its influence on the modified asphalt's performance.The result shows that,the parameters of preparation process of the modifier include cracking catalyst 2.6%,acidified oil 30.0%,extrusion temperature 290℃;the proportion of the modifier has significant influence on the high-and low-temperature performance of such modified asphalt.When the optimal content of modifier is 20.0%,the modified asphalt has the softening point and the ductility(5℃)increased significantly with low viscosity and good service behavior;desulfurized rubber may improve the complex modulus and rutting factor of the modified asphalt,reduce the phase angle,and improve the high temperature deformation resistance of the asphalt;the mixing of SBS increases the softening point and ductility of desulfurized rubber-modified asphalt,and improves the asphalt's short-term anti-aging and elastic recovery performances.