OICC Press International Journal of Industrial Chemistry 2228-5547 15 1 2024 03 15 Performance of composite modified asphalt based on nano-organic montmorillonite and silica 10.57647/j.ijic.2024.1501.08 EN Wenxiao Ren School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China Ping Li School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China Journal Article 2024 03 15 Asphalt pavement will inevitably face the problems of thermal aging and ultraviolet aging, so in order to improve the aging performance of asphalt and improve its service life, the modified asphalt based on nano organic monundedillonite and silica is proposed. Compared with the matrix asphalt, the penetration, ductility, softening temperature, and viscosity of modified asphalt were improved. The lowest penetration was 64 dmm, while the highest ductility, softening temperature, and viscosity were increased to 11.6cm, 54.1℃, and 1970cp. Meanwhile, when the temperature was 64℃, its irreversible creep compliance did not exceed 0.8 kPa-1. When the temperature was -12℃, the creep rate did not exceed 0.45. All were below the matrix asphalt. For the thermal aging performance, compared to matrix asphalt, the complex shear modulus aging index was decreased. The complex shear modulus aging index of short-term and long-term thermal aging was reduced by 44% and 23% respectively. For ultraviolet light aging performance, the growth rate of Brinell rotation viscosity for OMMT/SiO2 modified asphalt did not exceed 0.7. The above results indicate that nano organic montmorillonite and SiO2 can effectively improve the physical properties, thermal aging resistance, and ultraviolet light aging performance of asphalt.