Research on the Properties and Mechanism of Graphene/Nano-Tio2 Composite Modified Asphalt

In this paper, graphene was used to improve the dispersion of nano-TiO 2 in asphalt by preparing graphene and nano-TiO 2 composite modified asphalt with different dosages. The properties of nano-TiO 2 and graphene composite modified asphalt before and after short-term and long-term aging were analyzed by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) test. The mechanism of nano-TiO 2 and graphene composite modified asphalt was studied by particle sizer and scanning electron microscopy (SEM). The results indicated that the incorporation of graphene and nano-TiO 2 increased the elastic properties and the deformation resistance of asphalt at high temperature, and the graphene and nano-TiO 2 could improve the short-term and long-term aging resistance of asphalt. At low temperature, the short-term and long-term aging resistance was improved by compounding graphene and nano-TiO 2 with asphalt to some extent. The optimum composite dosage is 1% nano-TiO 2 and 0.04% graphene for improving the properties of asphalt. The dispersion of nano-TiO 2 was improved effectively by incorporating graphene, and adding graphene into asphalt could reduce the agglomeration of nano-TiO 2 in asphalt.