Study on Preparation and Properties of Nano-Al2O3 Modified Asphalt
To study the effects of Nano-Al2O3 modifier on the physical properties,rheological properties of A-70# matrix asphalt and its microscopic modification mechanism,Nano-Al2O3 modified asphalt with different contents(1％,2％,3％,4％,5％)is prepared based on laboratory tests,and its three indexes,viscosity,rheology,anti-aging properties and Fourier infrared spectroscopy test are carried out.The results show that the softening point and viscosity of matrix asphalt after Nano-Al2O3 is added are improved,the penetration and ductility are decreased,and the optimal content of Nano-Al2O3 is 4％.The rheological test result shows that Nano-Al2O3 can improve the rutting factor of the matrix asphalt and significantly enhance its high temperature stability to improve the anti-aging properties,but it is not good for the anti-cracking performance at low temperature.According to the microscopic analysis results,there are both physical changes and weak chemical reactions between Nano-Al2O3 and the matrix asphalt.
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