基于生物油表面修饰的PET改性沥青性能研究

Research on Performance of PET Modified Asphalt Based on Surface Modification of Bio-oil

采用生物油对废旧塑料颗粒(PET)进行表面修饰,制备了不同PET含量(10%、15%和20%)的改性沥青。为了评价表面修饰后PET改性沥青的相容性改善程度,基于离析试验以上下软化点差和相分离因子为评价指标,并采用接触角试验测定处理前后改性沥青的表面能。此外,还对基于生物油表面修饰的PET改性沥青的高温和低温流变性能进行了研究。研究结果表明,经生物油表面处理促进后,PET改性沥青的软化点差和相分离因子均减少。与未处理塑料的沥青相比,使用生物油处理过的PET改性沥青的蠕变劲度和不可恢复蠕变柔量J nr减少,而蠕变速率m和恢复率提高,说明改性沥青的高低温性能也得到了改善。采用生物油进行表面处理,使PET与沥青之间的相容性增强,提高了改性沥青的环保效益和路用性能。

In this study,bio-oil was used to modify the surface of waste plastic particles(PET),and modified asphalts with different PET contents(10%,15%,and 20%)were prepared.To evaluate the degree of compatibility improvement of PET modified asphalt after surface modification,based on the separation test,the upper and lower softening point difference and the phase separation index were used as evaluation indicators.Meanwhile,the contact angle test was performed to measure the surface energy of the modified asphalt before and after treatment.In addition,the high-and low-temperature rheological properties of PET-modified asphalt based on bio-oil surface modification were also studied.The results show that after the promotion of bio-oil surface treatment,the softening point difference and phase separation index of PET modified asphalt are reduced.Compared with the untreated modified asphalt,the creep stiffness and J nr value of the PET modified asphalt treated with bio-oil are reduced,and the m value and percentage of recovery are increased,indicating that the high-and low-temperature performance of the modified asphalt has also been improved.In this study,bio-oil was used for surface treatment to enhance the compatibility between PET and asphalt and improve the environmental benefits and road performance of modified asphalt.