Study on Anti-aging Properties of Nanoparticle Modified Rubber Asphalt
PENG Bo1, LING Tianqing2,*, GE Hao2
1 School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract: Asphalt aging is one of the important factors for the deterioration of paved roads, which seriously reduces the service life of asphalt concrete pavements, increases maintenance costs, and leads to more carbon emissions. Driven by low-carbon and environmental protection policies, improving the aging resistance of asphalt and prolonging the service life of asphalt concrete pavement have become an urgent problem to be solved. The high activity and high display energy of inorganic nanoparticles make it possible to improve the aging resistance of asphalt. The high activity and high display energy of inorganic nanoparticles make it possible to improve the aging resistance of asphalt. Therefore, in this study, waste rubber powder modified asphalt was used as the matrix, and different dosages (1%, 2%, 3%, mass fraction) was mixed with nano-ZnO, nano-SiO2 and nano-TiO2 respectively to prepare modified asphalt, and the effect and mechanism of inorganic nanoparticles on the anti-aging performance of asphalt were explored. The test results show that the aging resistance of asphalt modified by incorporating inorganic nanoparticles is significantly improved. When 2wt% nano-TiO2 is added, the improvement effect of asphalt aging resistance is the best, and the residual penetration after photo-oxidative aging compared with that before modification, it increased by 13.2%, and the softening point increment decreased by 60.7%. The incorporation of inorganic nanoparticles improves the UV light absorption ability of the asphalt and optimizes the internal peak structure, thereby enhancing the viscoelasticity of the modified asphalt and delaying the aging of the asphalt. The test results have guiding significance for the preparation of anti-aging asphalt and long-life asphalt concrete pavement.
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2022, Vol. 36 
