Performance of Plant-Produced Asphalt Containing Cellular Capsules

Area of Science:

• Materials Science
• Civil Engineering
• Chemical Engineering

Background:

• Asphalt mixtures are susceptible to performance degradation over time.
• Encapsulated rejuvenators offer a novel approach to enhance asphalt durability.
• Understanding the mechanical behavior of capsules within asphalt is crucial for performance optimization.

Purpose of the Study:

• To evaluate the impact of encapsulated rejuvenators on plant-produced asphalt performance.
• To investigate the role of polymeric capsules as cellular materials for energy absorption.
• To assess manufacturing variables affecting capsule deformation and asphalt properties.

Main Methods:

• Mechanical and morphological characterization of plant-produced asphalt with encapsulated rejuvenators.
• Evaluation of capsule distribution and integrity post-mixing.
• Comparative analysis with lab-produced asphalt under controlled conditions.
• Qualitative assessment of capsule deformation using Finite Element (FE) modeling.

Main Results:

• Cellular capsules demonstrated resilience during asphalt plant mixing.
• Capsule deformation positively influenced asphalt performance: stability increased by up to 13%, particle loss decreased by up to 25%, and macrotexture improved by 10%.
• The integration of capsules within the aggregate skeleton is key for maximizing energy absorption.

Conclusions:

• Encapsulated rejuvenators can be effectively incorporated into plant-produced asphalt mixtures.
• The cellular nature of the capsules contributes to improved asphalt durability and performance characteristics.
• Optimizing capsule placement within the aggregate structure is essential for leveraging their energy absorption capabilities.