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Volume 56 Issue 1
Jan.  2021
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Journal of Southwest Jiaotong University  > 2021  >  56(1): 108-115.
YU Jiang, ZHAO Qun, YE Fen, SONG Qingqing. Low Temperature Rheological Performance Analysis of Rubber Modified Asphalt under Heat Aging Process[J]. Journal of Southwest Jiaotong University, 2021, 56(1): 108-115. doi: 10.3969/j.issn.0258-2724.20180987
Citation: YU Jiang, ZHAO Qun, YE Fen, SONG Qingqing. Low Temperature Rheological Performance Analysis of Rubber Modified Asphalt under Heat Aging Process[J]. Journal of Southwest Jiaotong University, 2021, 56(1): 108-115. doi: 10.3969/j.issn.0258-2724.20180987
shu

Low Temperature Rheological Performance Analysis of Rubber Modified Asphalt under Heat Aging Process

doi: 10.3969/j.issn.0258-2724.20180987
  • Received Date: 15 Nov 2018
  • Rev Recd Date: 20 Mar 2019
    • Available Online: 04 Apr 2019
  • Publish Date: 01 Feb 2021
    Abstract
  • In order to explore the low temperature rheological properties of rubber modified asphalt (namely the activated twin-screw extruded rubber (AER) powder modified asphalt) and AER/SBS (styrene-butadiene styrene) composite modified asphalt under aging. The low temperature rheological properties of AER modified asphalt and its composite modified asphalt under different aging conditions and different rubber powder content were studied using conventional performance, low temperature bending test and Burgers model. At the same time, the influence of aging on the functional group of AER rubber modified asphalt was quantitatively analyzed by infrared FTIR method, and the correlation between its functional group index and various low temperature indicators was analyzed. The results show that AER and SBS can improve the low temperature performance of asphalt under different aging conditions; the low temperature performance of AER/SBS composite modified asphalt is better than AER modified asphalt under short-term aging, while the opposite is true under long-term aging. Both AER and SBS modifiers can improve the stiffness modulus of asphalt and AER has a greater impact on asphalt stiffness modulus, while low temperature grading indexes (i.e., stiffness modulus S, creep rate m, and the ratio S/m) and viscoelasticity indexes (i.e., relaxation time λ and dissipation-storage energy ratio a has a strong correlation. The low temperature performance of AER modified asphalt has a high correlation with the fat index IA and the fat long chain index IAL: the greater the aliphatic index, the better the low temperature performance, while the aliphatic fat long chain index is the opposite.

     

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