Elucidation of Degradation Mechanisms of New and Recycled Asphalt Mixtures Through Physical Property Measurements by Using Spring-8 X-Ray Ct

Key Points

• To elucidate the degradation mechanisms and crack development in new and recycled asphalt mixtures.
• Conducted bending fatigue tests on new and recycled asphalt mixtures.
• Utilized SPring-8 for microscopic measurements and analysis of internal structures.
• Compared failure mechanisms between new and recycled asphalt samples.
• Identified that asphalt detachment from aggregates is a primary damage cause in new mixtures.
• Found that interface damage between old asphalt and fine aggregates is critical in recycled mixtures.
• Suggested methods to mitigate pavement damage based on these findings.