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This work examines the aging mechanisms and cryogenic performance of crumb rubber modified asphalt under extreme environmental conditions.

Composition–structure–property relationships of crumb rubber modified asphalt under strong radiation–low temperature coupled aging

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Randomized trial explores crumb rubber modified asphalt performance in high altitude pavements, suggesting improved resilience against aging.

This work examines the aging mechanisms and cryogenic performance of crumb rubber modified asphalt under extreme environmental conditions.
Evaluated 10%/15%/20% crumb rubber modified asphalt using various aging processes including RTFO, PAV, and ozone aging.
Conducted BBR tests at temperatures from −6 to −24 °C to assess low-temperature rheology.
Utilized SARA, GPC, and FTIR analyses to investigate microchemical changes.
Coupled aging increased creep stiffness (S) and reduced m-value, indicating altered rheological properties.
Higher rubber dosage (20%) and finer rubber mesh slowed component transformation, preserving relaxation capacity.
Grey correlation and ridge regression showed S is dependent on heavy fractions, while m reacts more to light fractions, with optimal m prediction at −24 °C.

Yu et al. (2026) studied this question.

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Randomized trial explores crumb rubber modified asphalt performance in high altitude pavements, suggesting improved resilience against aging.