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 multistress creep recovery test, the change rule of microstructure and macromechanics characteristic of rubber-modified asphalt was obtained and the relationship between them was established through infrared spectrum test. 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 antirutting factor (G*/sinδ) and creep recovery rate R3.2 showed a trend of gradual decrease, while the loss factor (tanδ) and nonrecoverable 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 0.8880. The C═C index showed a best linear correlation with Brookfield viscosity at 135°C, 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°C, the S═O index showed the best correlation with the Brookfield viscosity at 135°C, and the C═C index showed the best correlation with the softening point.


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    Titel :

    Study on the Relationship between Microstructure and Macroproperties of Rubber Asphalt at Different Activation Temperatures


    Weitere Titelangaben:

    J. Highway Transp. Res. Dev. (English Ed.)


    Beteiligte:
    Zhang, Guang-tai (Autor:in) / Yi, Bao (Autor:in) / Zhang, Xiao-xu (Autor:in) / Zhang, Jin-peng (Autor:in)


    Erscheinungsdatum :

    2021-09-01




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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