Document Type : Research Paper
School of Chemical Engineering and Technology, Sun Yat sen University,
To investigate the rheological properties of nanomaterial compounding mastic modified asphalt under different aging conditions is to make better use of the performance of modified asphalt when performing road project pouring. In this paper, the high and low-temperature rheological properties of Nano-SiO2, Nano-TiO2, Nano-ZnO single modified asphalt and modified asphalt with mastic powder under different aging conditions were investigated by three aging methods, namely short-term aging, long-term aging and UV aging, using multiple stress creep recovery and bending beam rheology tests. The glass transition temperature of the nanomaterials-modified asphalt was then analyzed by DMA test. The results showed that the high and low-temperature rheological properties and the resistance to high and low-temperature aging of the modified asphalt were better than those of SBS-modified asphalt, which were improved by 34.4% and 14.29%, respectively. Under different aging conditions, the Nano-TiO2/compounded binder solution showed the smallest changes in irrecoverable creep flexibility, stiffness modulus and glass transition temperature, and its resistance to UV aging and thermal oxidation was stronger with a correlation coefficient of 0.98 or more. This shows that Nano-TiO2/combined binder powder has better rheological properties of modified asphalt than the other two binder powder solutions.