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We investigated the thermooxidative aging mechanism of crumb‐rubber‐modified asphalts (CRMAs) by tracing the evolution of the chemical structure and physical properties of CRMA during aging. The chemical structural evolution of crumb rubber (CR) in various aged CRMAs was characterized by measurement of the crosslink structure and composition of extracted CR. The residual asphalt of the aged CRMA was investigated by IR spectroscopy. The physical properties of CRMA were characterized by conventional testing before and after aging. We found that the change in the physical properties of CRMA correlated well with both the evolution of the rubber network and the oxidation of asphalt. The thermooxidative aging resistance of CRMA was improved with increasing CR dosage; this further illustrated that aging promoted the dissolution of CR into asphalt.
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Wang et al. (2015) studied this question.
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