Enhancing Pavement Durability: Comparative Rheological Evaluation of Conventional and Rejuvenated Reclaimed Binders under Aging Conditions
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View abstract on PubMed
Summary
This summary is machine-generated.This study optimized recycled asphalt binders using rejuvenating agents, finding a 0.4% blend closely matches control bitumen properties. This enhances recycled mixture performance and sustainability in road construction.
Area Of Science
- Materials Science
- Civil Engineering
- Sustainable Pavement Technology
Background
- Recycled asphalt mixtures exhibit increased stiffness and brittleness, exacerbated by binder aging.
- Rejuvenating agents can improve flexibility but may cause performance variability and rutting.
- Optimizing binder blends is crucial for enhancing the performance of recycled asphalt pavements.
Purpose Of The Study
- To develop an optimal blend of reclaimed bitumen, rejuvenating agent, and pure bitumen.
- To achieve rheological properties comparable to 35/50 pen-grade bitumen for road paving applications.
- To evaluate the impact of rejuvenating agents on the aging resistance and rutting potential of recycled asphalt binders.
Main Methods
- Formulated rejuvenated binders using 30:70 blends of reclaimed asphalt bitumen and 50/70 pen-grade bitumen.
- Incorporated 0.2% to 0.6% rejuvenating agent by mass of reclaimed asphalt.
- Conducted penetration, softening point, viscosity, and dynamic shear rheometer tests under various aging conditions.
Main Results
- A binder blend with 0.4% rejuvenator demonstrated rheological properties similar to 35/50 pen-grade bitumen.
- This blend achieved a 20% to 55% stiffness reduction in recycled mixtures with 30% reclaimed asphalt.
- Rejuvenated binders showed comparable aging resistance (less than 5% difference in aging ratios) to control bitumen, but a 0.4% rejuvenator doubled rutting potential.
Conclusions
- An optimal blend of 0.4% rejuvenator enhances recycled asphalt binder performance, reducing stiffness and maintaining aging resistance.
- Careful control of rejuvenator content is necessary to mitigate rutting issues in recycled asphalt pavements.
- This research supports sustainable pavement construction by improving the viability of recycled asphalt materials.
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