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<p>This study examines the macro- and micro-scale aging behavior of asphalt under four coupled aging schemes that involve ultraviolet radiation, temperature, and oxygen. The asphalt binders used were 70# matrix asphalts from PetroChina (ZSY) and Huifeng (HF), aged for up to 8 days. Their rheological and chemical properties were comprehensively evaluated using dynamic shear rheometry, multiple stress creep recovery, bending beam rheometry, thin-layer chromatography with flame ionization detection, and Fourier transform infrared spectroscopy (FTIR). Under ultraviolet (UV)–thermal–oxygen coupled aging (Scheme 2), the rutting factor (<i>G*/sin δ</i>) increased by 107% and 117%. In comparison, unrecoverable creep compliance (<i>J</i><sub><i>nr3.2</i></sub>) decreased by 21.0% and 23.3% for ZSY and HF, respectively, indicating improved high-temperature performance. Simultaneously, stiffness modulus (<i>S</i>) rose by 8.94% and 17.6%, and creep rate (<i>m</i>) declined by 16.7% and 8.88%, suggesting reduced low-temperature flexibility. Aromatic content decreased by 10.4% and 12.6%, whereas asphaltene content increased by 196% and 158%, along with a 106% and 56% rise in the colloidal instability index (<i>I</i><sub><i>c</i></sub>). FTIR results showed that the carbonyl (<i>CI</i>) and sulfoxide (<i>SI</i>) indices increased by 128%/157% and 118%/100%, respectively. In contrast, Scheme 3 (UV only) induced moderate changes, and Scheme 4 (oxygen-free) showed minimal aging, highlighting oxygen’s critical role in oxidative degradation. Grey relational analysis identified asphaltene content as the most correlated with G*/sin <i>δ</i> and <i>R</i><sub><i>3.2</i></sub>, while <i>CI</i> and <i>SI</i> were strongly associated with <i>S</i> and <i>m</i>. These findings reveal the synergistic effects of UV, heat, and oxygen on asphalt aging, offering guidance for enhancing aging resistance and material optimization.</p>

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Macro–Micro Characterization and Aging Mechanism of Multi-factor Coupled Aging Asphalt

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Lingyun Kong,
  • He Zhen,
  • Yi Peng,
  • Jiayi Hu,
  • Songxiang Zhu,
  • Qiqi Shan,
  • Bo Yang

摘要

This study examines the macro- and micro-scale aging behavior of asphalt under four coupled aging schemes that involve ultraviolet radiation, temperature, and oxygen. The asphalt binders used were 70# matrix asphalts from PetroChina (ZSY) and Huifeng (HF), aged for up to 8 days. Their rheological and chemical properties were comprehensively evaluated using dynamic shear rheometry, multiple stress creep recovery, bending beam rheometry, thin-layer chromatography with flame ionization detection, and Fourier transform infrared spectroscopy (FTIR). Under ultraviolet (UV)–thermal–oxygen coupled aging (Scheme 2), the rutting factor (G*/sin δ) increased by 107% and 117%. In comparison, unrecoverable creep compliance (Jnr3.2) decreased by 21.0% and 23.3% for ZSY and HF, respectively, indicating improved high-temperature performance. Simultaneously, stiffness modulus (S) rose by 8.94% and 17.6%, and creep rate (m) declined by 16.7% and 8.88%, suggesting reduced low-temperature flexibility. Aromatic content decreased by 10.4% and 12.6%, whereas asphaltene content increased by 196% and 158%, along with a 106% and 56% rise in the colloidal instability index (Ic). FTIR results showed that the carbonyl (CI) and sulfoxide (SI) indices increased by 128%/157% and 118%/100%, respectively. In contrast, Scheme 3 (UV only) induced moderate changes, and Scheme 4 (oxygen-free) showed minimal aging, highlighting oxygen’s critical role in oxidative degradation. Grey relational analysis identified asphaltene content as the most correlated with G*/sin δ and R3.2, while CI and SI were strongly associated with S and m. These findings reveal the synergistic effects of UV, heat, and oxygen on asphalt aging, offering guidance for enhancing aging resistance and material optimization.