▎ 摘　　要

Functional carbon nanomaterials are incorporated in bitumen composites to enhance their mechanical performance; however, this process is significantly hindered by the poor dispersion of the nanomaterials in the bitumen composite bulk, and their sluggish interfacial interaction with the bitumen matrix. In this study, graphene/carbon nanotube (CNT) hybrid materials were used to reinforce a bitumen composite, exhibiting improved dispersion, while advancing the interfacial interactions between the carbon nanomaterials and the bitumen matrix. Comparing with the control bitumen sample, a Bitumen/Graphene composite and a Bitumen/CNT composite, the graphene/CNT hybrid notably improved several properties of the bitumen structure, such as rutting resistance, creep and recovery behavior, permanent deformation resistance, low-temperature cracking resistance and the degree of crosslinking in the bitumen. In particular, bitumen binders with 0.2 wt% graphene and 0.8 wt% CNT composite presented the optimal mechanical performance. These improvements can be attributed to the synergetic effects of the material and the formation of 1D-2D hybrid structures, which apart from increasing the contact area, effectively enhanced stress transfer at graphene/CNT and bitumen interface. (C) 2020 Elsevier Ltd. All rights reserved.