Abstract
Oxidative aging of asphalt binders is a primary cause of binder-related long-term road failures. Viscosity hardening is primarily due to the oxidative conversion of polar aromatics to asphaltenes; oxidation is indicated by carbonyl formation. The aging of unmodified asphalts yields a constant, aging-temperature independent “hardening susceptibility” (HS) relation between viscosity change and the growth of the infrared carbonyl peak. Crumb-rubber-modified asphalts (CRMA) exhibit superior aging characteristics, lower hardening rates, and, often, lower oxidation rates, throughout the aging simulation range. However, CRMA materials may exhibit a hardening susceptibility that varies with aging temperature, suggesting either enhanced diffusion resistance or a kinetic competition between the oxidation sites of the rubber polymer and the asphalt's polar aromatics. This evidence suggests that the commonly accepted high-temperature, high-pressure, long-term aging technique is of questionable value when applied to C...
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