Abstract:The effects of the type and dosage of high viscosity additives on the macroscopic properties of high viscoelastic modified asphalt are studied through the conventional property tests, dynamic viscosity test, elastic recovery test and Brookfield viscosity test. The microstructure of modified asphalt is explored by fluorescence microscope. The pavement performance of STC-10 high viscoelastic asphalt mixture prepared with the self-developed high viscosity additive is evaluated. The results show that the different types of high viscosity additives can significantly reduce the penetration of modified asphalt, and increase the softening point and ductility, but have the different effects on the dynamic viscosity at 60℃ and the viscosity at 135℃. The increase of the high viscosity additive dosage leads to the transformation of the scattered polymer particles in the modified asphalt to the network structure, and an obvious transition zone appears between the network structures, which plays an important role in the enhancement of the high-temperature and low-temperature performances of the modified asphalt. All performance indexes of STC-10 asphalt mixture meet the relevant technical requirements, which prove that the application of high viscoelastic modified asphalt and STC-10 grading in ultra-thin overlay is feasible. The research results provide a scientific basis for the application of a new type of high viscoelastic modified asphalt in synchronous ultra-thin overlays.
