1.Problems of graphene dispersion
Graphene has a single complete six membered ring structure, so there is a strong intermolecular force between graphene molecules, and the layers are easy to stack together, resulting in agglomeration. The surface of graphene is stable and inert, which makes it difficult to dissolve in basic solvents, and it is very difficult to functionally composite with other materials, which has become a huge problem in the application of graphene.
2.Countermeasures to the problem of decentralization
In order to improve the dispersion effect of graphene, the material with better dispersion effect is selected, which is called surfactant. According to different surfactants and basic solvents, the optimal dispersion of graphene is also different. Fluorescence microscope and ultraviolet visible spectrophotometer were used to determine the optimal amount of graphene.
When the well dispersed graphene is mixed into the matrix asphalt, it is necessary to intercalate the graphene and asphalt to reflect the physical adsorption capacity brought by the huge specific surface area of graphene. The intercalation effect of the mixture of graphene and asphalt can only be produced under the cavitation effect of ultrasonic instrument, sound flow effect and uniform dispersion effect of emulsified asphalt high-speed shear, Comprehensively improve the performance of asphalt road.
3.Study on Preparation Technology
The mixture of matrix asphalt and graphene was treated by emulsified asphalt high-speed shear and ultrasonic cell crusher. Using uniform design method, the asphalt treatment capacity, shear time, rotation number, asphalt temperature during shear, time and power of high-intensity ultrasound, graphene content, surfactant and basic solvent content were taken as the main influencing factors, and the three indexes, anti rutting factor and creep recovery rate were taken as response values. The model was established by using DPS and 1stOpt mathematical statistics software, The mixture ratio and preparation process parameters of graphene modified asphalt were obtained.