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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2019  >  19(5): 1-10
GU Xing-yu, CUI Bing-yan, XING Shi-qin, HAN Dong-dong. Comparison of numerical interconversion methods for relaxation modulus of asphalt mixture[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 1-10. doi: 10.19818/j.cnki.1671-1637.2019.05.001
Citation: GU Xing-yu, CUI Bing-yan, XING Shi-qin, HAN Dong-dong. Comparison of numerical interconversion methods for relaxation modulus of asphalt mixture[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 1-10. doi: 10.19818/j.cnki.1671-1637.2019.05.001
shu

Comparison of numerical interconversion methods for relaxation modulus of asphalt mixture

doi: 10.19818/j.cnki.1671-1637.2019.05.001
  • 1.

    School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China

  • 2.

    School of Engineering, Tibet University, Lasa 850011, Tibet, China

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  • Author Bio:

    GU Xing-yu(1976-), male, professor, PhD, guxingyu1976@163.com

  • Received Date: 2019-04-19
  • Publish Date: 2019-10-25
    Abstract
  • In order to obtain the relaxation modulus of asphalt mixture effectively, the numerical interconversion methods from dynamic modulus and creep compliance to relaxation modulus were compared. The conversion principle between linear viscoelastic parameters of asphalt mixture was investigated. The dynamic modulus and creep compliance of the same asphalt mixture were tested, respectively, and the master curves of experimental data were fitted. The function of relaxation modulus was obtained, and the possible reasons for the difference between two numerical interconversion methods were analyzed. The effects of different Maxwell element numbers on the calculation results of relaxation modulus were considered. The relaxation moduli of different asphalt mixtures were compared, and the applicability of two methods to different asphalt mixtures was validated. Research result shows that the fewer the number of Maxwell elements characterizing the asphalt mixtures' relaxation modulus is, the larger the fluctuation of master curves are. When the number of elements is greater than 11, the difference between master curves is lower than 5.26%. It is suggested to select about 11 elements to improve the computational efficiency. The relaxation modulus obtained from the conversion of dynamic modulus and creep compliance accords with the basic relaxation characteristics of materials. The coincidence degree of two master curves of relaxation modulus is high, and the correlation coefficient is greater than 0.99. In terms of different asphalt mixtures, the two methods are also applicable. In the linear viscoelastic range, the main difference of two methods is found in the lower time region that is from 10-8 s to 10-4 s. It is suggested to adopt the average value of two methods in practice to avoid the errors caused by the same test. Adding warm mixing agent may reduce the relaxation modulus of asphalt mixture to some extent. Compared to hot mix asphalt, the relaxation moduli of asphalt mixtures with foam agent and Evotherm warm mixing agent reduce by 14.69% and 13.61%, respectively. According to the influence degree on the relaxation modulus, the two kinds of warm mixing agents have the equivalent effect.

     

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