Investigation of creep fatigue interaction behavior in hot-mix asphalt based on bidirectional sequential trials

Document Type

Article

Publication Date

1-1-2026

Abstract

This study focuses on the bidirectional interaction between creep and fatigue in asphalt mixtures during actual pavement service. Bidirectional sequential trials were performed under a uniaxial loading mode, establishing two loading sequences: creep-fatigue and fatigue-creep. The effects of creep damage on subsequent fatigue properties and the effects of fatigue damage on subsequent creep properties were quantitatively assessed. The results show that under sequential creep-fatigue loading, a positive interaction effect was observed at 10 °C, with the initial modulus increasing by 16.8% and fatigue life extending by 86.8%; in contrast, significant negative interactions were observed at 25 °C and 45 °C, with fatigue life decreasing by 63.7% and 90.8%, respectively. Under fatigue-creep loading, a negative interaction was observed across the entire temperature range, with the most significant effect at 45 °C, where creep life decreased by 23.6%. The modified damage models achieved R2 values exceeding 0.783, demonstrating a high degree of correlation with experimental data. This suggests that the proposed models can effectively characterize the damage evolution trends of SBS-modified AC-20 under sequential creep and fatigue loading. This provides an experimental basis for evaluating the performance and predicting the service life of asphalt pavements under the combined effects of high-temperature deformation and fatigue loading.

Publication Title

International Journal of Pavement Engineering

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