How does the aging process impact asphalt binder?

The aging process significantly impacts asphalt binder by causing it to harden over time. This hardening occurs due to various factors, including exposure to air and UV light, leading to the oxidation of the binder. As the binder oxidizes, it loses volatile components and becomes stiffer and more brittle. This change can negatively influence the performance characteristics of the asphalt mix, which may lead to cracking and reduced flexibility under traffic loads.

The other effects of aging on asphalt binder do not align with the observed changes. Enhanced elasticity, improved adhesion capabilities, and increased fluidity are generally not associated with the aging process. Instead, as the binder hardens, it tends to lose elasticity, which can lead to a decreased ability to accommodate deformation and an increased likelihood of failure in the pavement structure. Understanding the aging process is crucial for ensuring the long-term performance and durability of asphalt pavements.