Zhou Gang, Li Chuanqiang, Wang Haobo, Zeng Wei, Ling Tianqing, Jiang Lin, Li Rukai, Liu Qizheng, Cheng Ying, Zhou Dan
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Materials (Basel). 2022 Jun 20;15(12):4346. doi: 10.3390/ma15124346.
The production of high-performance, low-cost warm mix additives (WMa) for matrix asphalt remains a challenge. The pyrolysis method was employed to prepare wax-based WMa using waste polypropylene plastic (WPP) as the raw material in this study. Penetration, softening point, ductility, rotational viscosity, and dynamic shear rheological tests were performed to determine the physical and rheological properties of the modified asphalt. The adhesion properties were characterized using the surface free energy (SFE) method. We proved that the pyrolysis temperature and pressure play a synergistic role in the production of wax-based WMa from WPPs. The product prepared at 380 °C and 1.0 MPa () can improve the penetration of matrix asphalt by 61% and reduce the viscosity (135 °C) of matrix asphalt by 48.6%. Furthermore, the modified asphalt shows favorable elasticity, rutting resistance, and adhesion properties; thus, it serves as a promising WMa for asphalt binders.
生产用于基质沥青的高性能、低成本温拌添加剂（WMa）仍然是一项挑战。本研究采用热解方法，以废弃聚丙烯塑料（WPP）为原料制备蜡基WMa。进行了针入度、软化点、延度、旋转粘度和动态剪切流变试验，以确定改性沥青的物理和流变性能。使用表面自由能（SFE）方法表征粘附性能。我们证明了热解温度和压力在由WPP制备蜡基WMa的过程中起协同作用。在380℃和1.0MPa（）下制备的产品可使基质沥青的针入度提高61%，并使基质沥青在135℃时的粘度降低48.6%。此外，改性沥青表现出良好的弹性、抗车辙性能和粘附性能；因此，它是一种有前景的沥青结合料用WMa。
