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    Volume 50, Issue 5 (September 2021)

    Special Issue Paper

    Effect of Thermal-Oxygen Aging on Temperature Stability of Styrene-Butadiene-Styrene–Modified Asphalt

    (Received 5 April 2021; accepted 11 June 2021)

    Published Online: 16 September 2021

    CODEN: JTEVAB

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    Abstract

    In order to explore the effect of aging on the temperature stability of styrene-butadiene-styrene (SBS)-modified asphalt, matrix asphalt and SBS-modified asphalt were used as the control to conduct short-term aging and long-term aging. Three indexes of asphalt with different aging degrees were tested to analyze the change rule of each index. The specific heat capacity and phase transition temperature of SBS-modified asphalt before and after aging were studied by differential scanning calorimetry (DSC). At last, the mechanism was studied by attenuated total reflection Fourier infrared spectroscopy. The results show that the penetration and ductility of matrix asphalt and SBS-modified asphalt decrease with the deepening of aging. The difference is that the softening point of matrix asphalt shows an increasing trend, whereas the softening point of SBS-modified asphalt shows a changing rule of first decreasing and then rising. The addition of SBS modifier can increase the specific heat capacity of asphalt and change the viscosity-flow conversion temperature. The degradation of SBS modifier leads to the decrease of the specific heat capacity after long-term aging, whereas the viscosity-flow conversion temperature decreases first and then rises, which is consistent with the change law of softening point. As a special block copolymer, the specific heat capacity of SBS modifier is determined by the polymer butadiene with lower glass transition temperature, whereas the softening point changes with the polymer styrene with higher glass transition temperature, which is consistent with the change rule of functional group index, softening point, and specific heat capacity of SBS-modified asphalt before and after aging.

    Author Information:

    Wang, Lan
    School of Science, Inner Mongolia University of Technology, Hohhot, Inner Mongolia

    School of Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia

    Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia

    Xue, Zhihua
    School of Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia

    Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia

    Zhang, Le
    Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia

    School of Science, Inner Mongolia University of Technology, Hohhot, Inner Mongolia


    Stock #: JTE20210215

    ISSN:0090-3973

    DOI: 10.1520/JTE20210215

    Author
    Title Effect of Thermal-Oxygen Aging on Temperature Stability of Styrene-Butadiene-Styrene–Modified Asphalt
    Symposium ,
    Committee D04