废旧聚乙烯/废旧聚丙烯/废硫渣复合改性剂含量对改性沥青性能的影响

Effect of content of recycled polyethylene/recycled polypropylene/recycled sulfur slag complex modifiers on properties of modified asphalt

通过双螺杆挤出造粒技术,用废旧聚乙烯/废旧聚丙烯/废硫渣(RPE/RPP/SP,质量比6/4/0.7)原材料制备了沥青改性剂(SPM)。研究了不同含量SPM对AH-70改性沥青针入度、延度、软化点、黏度、低温抗裂及流变性能的影响,并从红外光谱及微观形貌角度进行验证。分析结果表明:SPM显著改善了AH-70沥青的高温性能,一定含量的SPM对改性沥青低温性能有积极作用。本研究为SPM改性剂在交通建设中的应用提供理论依据。

In this study,an asphalt modifier(SPM)was prepared through a twin⁃screw extrusion granulation technology using recycled polyethylene/recycled polypropylene/recycled sulfur slag materials as raw materials at a mass ratio of 6/4/0.7.The effect of SPM content on the penetration,ductility,softening point,viscosity,low temperature crack resis⁃tance and rheology of modified AH⁃70 asphalt was investigated.The modification effectiveness was verified by the infra⁃red spectrum and microtopography.The results indicated that the introduction of SPM improved the high temperature performance of the modified asphalt significantly,and a certain content of SPM could generate a positive effect on the low⁃temperature performance of the modified asphalt.This work can provide a theoretical basis for the application of SPM modifier in traffic construction.