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<p>The long-term aging (LTA) and self-healing properties of asphalt mixtures are crucial for predicting the durability and performance of pavement materials, as they are affected by environmental factors and traffic loading over time. However, the specific effects of different aging methods on the self-healing potential of asphalt mixtures have the potential to be further investigated. The objective of this study is to evaluate the LTA of asphalt mixtures using the AASHTO R30 standard, with a focus on comparing the self-healing index (HI) of plant-produced and laboratory-aged samples. To achieve this, samples from pavements aged 7, 10, and 11 years were compared with laboratory-prepared samples under AASHTO R30 aging conditions. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze oxidation and chemical aging in the asphalt binders, while mechanical performance was assessed using Semi-Circular Bending (SCB) and Three-Point Bending (3&#xa0;PB) tests to examine the self-healing potential. FTIR results indicated greater aging at the asphalt surface, with deeper sections showing more severe aging than mid-sections due to the influence of aggregate gradation and void ratios. Assessment of mid-layer samples (1–4&#xa0;cm depth) showed up to 60% self-healing when crack width and temperature were optimized. SCB tests revealed effective self-healing at 35&#xa0;°C, with up to 16% healing observed for 11-year old samples. The results suggest that AASHTO R30 aging simulations reliably replicate the oxidative and mechanical aging processes observed in field-aged asphalt, with the HI serving as a critical metric for assessing the long-term durability and restorative capacity of asphalt mixtures under various aging conditions.</p>

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Evaluating the Effectiveness of the AASHTO R30 Aging Standard Through the Self-Healing Index: A Comparative Analysis of Laboratory-Aged and Field-Aged Asphalt Mixture Samples

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月18日

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  • Mohammadreza Mirzamojeni,
  • Iman Aghayan,
  • Mahdi Ghahremani,
  • Reza Behzadian,
  • Qing Lu

摘要

The long-term aging (LTA) and self-healing properties of asphalt mixtures are crucial for predicting the durability and performance of pavement materials, as they are affected by environmental factors and traffic loading over time. However, the specific effects of different aging methods on the self-healing potential of asphalt mixtures have the potential to be further investigated. The objective of this study is to evaluate the LTA of asphalt mixtures using the AASHTO R30 standard, with a focus on comparing the self-healing index (HI) of plant-produced and laboratory-aged samples. To achieve this, samples from pavements aged 7, 10, and 11 years were compared with laboratory-prepared samples under AASHTO R30 aging conditions. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze oxidation and chemical aging in the asphalt binders, while mechanical performance was assessed using Semi-Circular Bending (SCB) and Three-Point Bending (3 PB) tests to examine the self-healing potential. FTIR results indicated greater aging at the asphalt surface, with deeper sections showing more severe aging than mid-sections due to the influence of aggregate gradation and void ratios. Assessment of mid-layer samples (1–4 cm depth) showed up to 60% self-healing when crack width and temperature were optimized. SCB tests revealed effective self-healing at 35 °C, with up to 16% healing observed for 11-year old samples. The results suggest that AASHTO R30 aging simulations reliably replicate the oxidative and mechanical aging processes observed in field-aged asphalt, with the HI serving as a critical metric for assessing the long-term durability and restorative capacity of asphalt mixtures under various aging conditions.