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<p>Reclaimed Asphalt (RA) is a mixture of quality aggregates and aged asphalt binder that can substitute virgin aggregates and asphalt binder in new bituminous mixes. Quantifying the amount of recycled asphalt binder available from the RAP is essential because the availability varies based on mix design and production conditions. Designing a Recycled Asphalt Mixture (RAM) under the presumption of 100% asphalt binder availability will have an impact on the mixture’s stiffness, which in turn affects field performance. The present study quantifies the Degree of Binder Availability (DoAv) from the coarse and fine RAP fractions when RAM is prepared using RAP of varying stiffness or ageing conditions. Recycled asphalt binder availability is calculated based on the additional virgin asphalt binder content required to produce the RAM, to meet the same volumetric and densification criteria as those of the control mixture produced with virgin aggregate and asphalt binder. Dynamic Creep test and Indirect Tensile Cracking test were performed on RAM to evaluate the rutting and cracking performance of the recycled mixtures. The effect of RAP age, RAP fraction size and RAP content on DoAv was determined using ANOVA. The performance of RAMs was evaluated with respect to the weighted stiffness of the recycled mix and compared with that of virgin asphalt mixtures to ensure the suitability of the recycled mixtures for field application. DoAv was found to decrease with RAP ageing. When the RAP age increased from 1&#xa0;day to 15 days, the DoAv of 30% and 50% coarse RAMs dropped from 76.8 to 45.5% and 87.9 to 48.8%, respectively. Whereas the DoAv of 30% fine RAMs was reduced from 90.5 to 80.2% only. Rutting resistance of RAMs increased with an increase in stiffness of the mix, whereas cracking resistance decreased. There exists a range of RAM stiffness, with good rutting and cracking performance.</p>

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Effect of RAP fractionation and ageing on recycled binder availability and recycled mixture performance

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Anusree A,
  • Vishnu Radhakrishnan

摘要

Reclaimed Asphalt (RA) is a mixture of quality aggregates and aged asphalt binder that can substitute virgin aggregates and asphalt binder in new bituminous mixes. Quantifying the amount of recycled asphalt binder available from the RAP is essential because the availability varies based on mix design and production conditions. Designing a Recycled Asphalt Mixture (RAM) under the presumption of 100% asphalt binder availability will have an impact on the mixture’s stiffness, which in turn affects field performance. The present study quantifies the Degree of Binder Availability (DoAv) from the coarse and fine RAP fractions when RAM is prepared using RAP of varying stiffness or ageing conditions. Recycled asphalt binder availability is calculated based on the additional virgin asphalt binder content required to produce the RAM, to meet the same volumetric and densification criteria as those of the control mixture produced with virgin aggregate and asphalt binder. Dynamic Creep test and Indirect Tensile Cracking test were performed on RAM to evaluate the rutting and cracking performance of the recycled mixtures. The effect of RAP age, RAP fraction size and RAP content on DoAv was determined using ANOVA. The performance of RAMs was evaluated with respect to the weighted stiffness of the recycled mix and compared with that of virgin asphalt mixtures to ensure the suitability of the recycled mixtures for field application. DoAv was found to decrease with RAP ageing. When the RAP age increased from 1 day to 15 days, the DoAv of 30% and 50% coarse RAMs dropped from 76.8 to 45.5% and 87.9 to 48.8%, respectively. Whereas the DoAv of 30% fine RAMs was reduced from 90.5 to 80.2% only. Rutting resistance of RAMs increased with an increase in stiffness of the mix, whereas cracking resistance decreased. There exists a range of RAM stiffness, with good rutting and cracking performance.