Abstract In order to explore the relationship between the microstructure characteristics and the macromechanics characteristic of rubber modified asphalt at different activation temperatures, on the basis of conventional performance testing, dynamic shear rheological test and multi-stress creep recovery test, the change rule of microstructure and macromechanics characteristic of rubber modified asphalt were obtained and the relationship between them was established through infrared spectrum test. And through the grey correlation analysis, the relationships among the macromechanics characteristic, the microstructure index and the macromechanics index of the rubber modified asphalt at different activation temperatures were obtained. Results showed that:under the infrared spectrum, the activation of the rubber powder mainly changed the stretching vibration intensity of the sulfoxide group and butadienyl groups at 1030 cm-1 and 1600 cm-1, respectively. With the increase of activation temperature, the sulfoxide group (S=O) and the butadienyl group (C=C) indexes under infrared spectra gradually decreased, the anti-rutting factor (G*/sin δ) and creep recovery rate R3.2 showed a trend of gradual decrease, while the loss factor (tan δ) and non-recoverable creep compliance Jnr3.2 showed a trend of gradual increase. From the relationship model between micro and macro indexes, it could be seen that the S=O of rubber modified asphalt showed a good correlation with macromechanics characteristics. Among those, S=O showed the best linear correlation with the ductility, with the coefficient of determination R2 0.888 0. The C=C index showed a best linear correlation with Brookfield viscosity at 135℃, with the coefficient of determination R2 0.9909. It had a poor correlation with needle penetration. It can be seen from the grey correlation analysis that the rubber modified asphalt showed the best comprehensive mechanical properties when the activation temperature was 70℃, and the S=O index showed the best correlation with the Brookfield viscosity at 135℃, and the C=C index showed the best correlation with the softening point.
ZHANG Guang-tai,YI Bao,ZHANG Xiao-xu, et al. Study on the Relationship between Microstructure and Macro-properties of Rubber Asphalt at Different Activation Temperatures[J]. Journal of Highway and Transportation Research and Development, 2021, 15(3): 1-10.
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2021, Vol. 15 
