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<p>This study investigates the relationship between functional group indices and the low temperature performance of asphalt by analysing 12 substrates and modified asphalt types. Using rotating film aging, pressure aging, A bending beam rheometer (BBR), differential scanning calorimetry (DSC) and infrared spectroscopy, key low temperature properties such as stiffness modulus, creep rate, and glass transition temperature (Tg), alongside chemical composition indices including characteristic peak and functional group, were assed under both short- and long-term aging conditions. The results show that the type of modifier has the most significant effect on the low temperature performance of asphalt. Under aging conditions, unsaturated chains and cycloalkanes in asphalt oxidize into functional groups like aldehydes and ketones, resulting in obvious infrared spectral absorption peaks at 1700&#xa0;cm<sup>− 1</sup>. Corelating macroscopic and microscopic evaluation indices identified that the aromatic ring index exhibits the strongest correlation with Tg, stiffness modulus, and creep rate. This finding demonstrates that low-temperature performance directly impacts the aromatic ring index, which could provide insights into the chemical mechanisms affecting asphalt durability under various aging conditions.</p>

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Influence of Functional Group Index on Low-Temperature Performance of Asphalt

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Lingyun Kong,
  • Qiqi Shan,
  • Yi Peng,
  • Zhuoxin Liu,
  • Yuan Qi,
  • Bo Yang,
  • Qiang Joshua Li

摘要

This study investigates the relationship between functional group indices and the low temperature performance of asphalt by analysing 12 substrates and modified asphalt types. Using rotating film aging, pressure aging, A bending beam rheometer (BBR), differential scanning calorimetry (DSC) and infrared spectroscopy, key low temperature properties such as stiffness modulus, creep rate, and glass transition temperature (Tg), alongside chemical composition indices including characteristic peak and functional group, were assed under both short- and long-term aging conditions. The results show that the type of modifier has the most significant effect on the low temperature performance of asphalt. Under aging conditions, unsaturated chains and cycloalkanes in asphalt oxidize into functional groups like aldehydes and ketones, resulting in obvious infrared spectral absorption peaks at 1700 cm− 1. Corelating macroscopic and microscopic evaluation indices identified that the aromatic ring index exhibits the strongest correlation with Tg, stiffness modulus, and creep rate. This finding demonstrates that low-temperature performance directly impacts the aromatic ring index, which could provide insights into the chemical mechanisms affecting asphalt durability under various aging conditions.