道路沥青TPAE改性剂制备工艺与交互特性研究OA

[Objective]To optimize and enhance the performance of asphalt pavement materials using elastomer materials,thermoplastic polyamide elastomer(TPAE)is selected as the base material.The micromorphological characteristics and typi-cal structures of TPAE are comprehensively characterized and identified.[Methods]TPAE powder modifiers were prepared using low-temperature precision grinding,and the micromorphological characteristics of modifiers with different particle sizes were compared and analyzed.The destructive effects of the low-temperature grinding process on the microstructure of TPAE modifiers were clarified.The interaction state at the micro-interface between the TPAE modifier and asphalt binder was thor-oughly analyzed,and the compatibility of TPAE-modified asphalt was comprehensively analyzed based on the rheological model.[Results](1)The TPAE particle cut surfaces contained numerous circular structures with smooth,clear edges,and intact shapes.(2)These circular structures existed independently within the cross-section,with only a small portion showing clustered aggregation.(3)The vertical aspect ratio of the 0.150 mm and 0.075 mm TPAE powders increased significantly,and the spherical structures in the micromorphology of the TPAE powders became incomplete,with noticeable cutting damage appearing along the edges of some particles.(4)The 0.075 mm TPAE powder bound tightly with the base asphalt,exhibiting a clear interface without obvious voids or gaps.[Conclusion]TPAE-modified asphalt is a heterogeneous polymer system.The 0.075 mm TPAE powder demonstrates good compatibility with the asphalt and stronger interaction with it,thereby reduc-ing the segregation of the modified asphalt and indicating the feasibility of applying the TPAE modifier in asphalt materials.