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The study aimed to restore the bitumen binder extracted from reclaimed asphalt pavement (RAP) to match the desired properties of a virgin VG-40 binder. This goal was achieved through a comprehensive characterization of the binders, both chemically and through performance testing. The RAP binder was blended with VG-40 bitumen at various percentages, and a rejuvenator (RJ) was added to achieve the desired consistency. The optimal dosage of RJ was determined by comparing its rheological properties with those of the VG-40 binder. Fourier-transform infrared spectroscopy (FTIR) was used to analyze the blended binders, identifying key functional groups chemically. Multiple stress creep and recovery (MSCR) tests were employed to assess rutting resistance at 60 °C using a dynamic shear rheometer (DSR) under both unaged and short-term aged (STA) conditions. The study revealed correlations between the rejuvenator/total binder (R/T) ratio, chemical indices, and kinematic viscosity, validating binder characterization at the target proportions.

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Characterizing the Chemical Composition and Rutting Performance of RAP and RAP-Rejuvenated Bitumen

  • 会议论文

  • 发表日期：

    2026年

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  • A. S. Niranjan,
  • Sachin Gowda,
  • Aakash Gupta,
  • G. Kavitha

摘要

The study aimed to restore the bitumen binder extracted from reclaimed asphalt pavement (RAP) to match the desired properties of a virgin VG-40 binder. This goal was achieved through a comprehensive characterization of the binders, both chemically and through performance testing. The RAP binder was blended with VG-40 bitumen at various percentages, and a rejuvenator (RJ) was added to achieve the desired consistency. The optimal dosage of RJ was determined by comparing its rheological properties with those of the VG-40 binder. Fourier-transform infrared spectroscopy (FTIR) was used to analyze the blended binders, identifying key functional groups chemically. Multiple stress creep and recovery (MSCR) tests were employed to assess rutting resistance at 60 °C using a dynamic shear rheometer (DSR) under both unaged and short-term aged (STA) conditions. The study revealed correlations between the rejuvenator/total binder (R/T) ratio, chemical indices, and kinematic viscosity, validating binder characterization at the target proportions.