石墨烯及其衍生物改性沥青的研究进展

Research Progress of Asphalt Modified by Graphene and Its Derivatives

石墨烯及其衍生物等新型纳米碳材料,因其优异的力学性能、巨大的比表面积和良好的导电导热性能等性质,作为纳米改性剂在沥青领域得到了重点关注,可显著提高改性沥青的高低温性能以及抗疲劳性能,有望解决传统改性沥青耐久性差的问题。本文系统总结了石墨烯及其衍生物改性沥青的最新研究进展,从石墨烯结构和表面特性的角度重点评述了石墨烯含量、层数、孔缺陷、表面化学态对沥青改性效果的影响及改性机理,同时介绍了石墨烯改性沥青的实际工程应用情况。最后针对石墨烯改性沥青性能与两者之间的相容性的依赖关系,提出了利用孔缺陷和元素掺杂石墨烯促进石墨烯在沥青中的分散及相容性的研究新策略。

Graphene and graphene derivatives with two-dimension structures have been received much attention in the field of asphalt modification due to their excellent mechanical properties,high specific surface area,and good electrical and thermal conductivity,which can obviously enhance the high and low temperature performance and fatigue resistance of asphalt.Therefore,they are expected to solve the poor durability of traditional modified asphalt.This review summarizes the latest research works on the graphene and its derivatives modified asphalt,focusing on key influencing factors(content,layer number and defect,chemical state of graphene)for the asphalt modification as well as their modification mechanism from the viewpoint of graphene intrinsic characteristics and asphalt at molecular level,and introduces the practical engineering application of graphene modified asphalt.Finally,a new strategy of using pore defects and element doped graphene to promote the dispersion and compatibility of graphene in asphalt is proposed,according to the relationship between the performance of graphene modified asphalt and the compatibility between them.