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<p>This research presents the discrete relaxation spectra and main relaxation times of asphalt binders based on the static stress relaxation test. Both the classic viscoelastic model and fractional differential model were considered in the data fitting. It was found the stress relaxation process of asphalt binder was composed of rapid and steady relaxation periods. Higher temperature led to more rapid stress relaxation. Model fitting showed the main relaxation time of asphalt binder was around 0.002 to 0.005&#xa0;s. The main relaxation strength showed greatest contribution to material stress relaxation; whereas other secondary relaxation times showed smaller contribution to stress relaxation process. Additionally, main relaxation times of the asphalts dropped with temperature, suggesting that binder elasticity was weakened as temperature rises. The asphalt rubber (AR) and styrene butadiene styrene (SBS) modified asphalt binders showed greater main relaxation times than the 70# asphalt binder at 20℃ which means better binder elasticity could be attained by the modification process. It was finally suggested that the generalized Maxwell model with at least five parallel units was needed to obtain a good fitting on the stress relaxation behavior of asphalt binder. Moreover, the fractional differential model was also a good alternative which was comparable to the generalized Maxwell model.</p>

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Calculating the Quasi Relaxation time Spectrum of Asphalt Binder from Static Stress Relaxation Experiments: A Technical Note

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Lili Han,
  • Qitao Zhu,
  • Jinlin QI,
  • Zhengang Feng,
  • Jianfeng Yang

摘要

This research presents the discrete relaxation spectra and main relaxation times of asphalt binders based on the static stress relaxation test. Both the classic viscoelastic model and fractional differential model were considered in the data fitting. It was found the stress relaxation process of asphalt binder was composed of rapid and steady relaxation periods. Higher temperature led to more rapid stress relaxation. Model fitting showed the main relaxation time of asphalt binder was around 0.002 to 0.005 s. The main relaxation strength showed greatest contribution to material stress relaxation; whereas other secondary relaxation times showed smaller contribution to stress relaxation process. Additionally, main relaxation times of the asphalts dropped with temperature, suggesting that binder elasticity was weakened as temperature rises. The asphalt rubber (AR) and styrene butadiene styrene (SBS) modified asphalt binders showed greater main relaxation times than the 70# asphalt binder at 20℃ which means better binder elasticity could be attained by the modification process. It was finally suggested that the generalized Maxwell model with at least five parallel units was needed to obtain a good fitting on the stress relaxation behavior of asphalt binder. Moreover, the fractional differential model was also a good alternative which was comparable to the generalized Maxwell model.