Effect of Thermal Oxidative Degradation on the Properties of Recycled Asphalt Mixtures Containing Substandard Rap

Key Points

• This research investigates the impact of thermal oxidative degradation on the properties of recycled asphalt mixtures that include low-quality recycled aggregates.
• Manufactured recycled asphalt mixtures using four types of recycled aggregates with varying degradation levels.
• Simulated thermal conditions to mimic in-service environments for degradation assessment.
• Evaluated changes in the physical properties of the asphalt mixtures.
• Identified that thermal oxidative degradation causes hardening of asphalt.
• Observed a decline in fatigue resistance and cracking resistance due to degradation.
• Noted that mixtures with more degraded aggregates demonstrated significant property reductions earlier.
• Suspected that the amount of recycled additives influences the physical property changes.