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. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43323.
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机译：我们通过跟踪老化过程中CRMA的化学结构和物理性质的演变，研究了碎屑橡胶改性沥青（CRMA）的热氧化老化机理。通过测量交联结构和提取的CR的成分来表征各种老化CRMAs中的粒状胶（CR）的化学结构演变。通过IR光谱研究了老化的CRMA的残余沥青。 CRMA的物理性质通过老化前后的常规测试来表征。我们发现，CRMA物理性质的变化与橡胶网络的演化和沥青的氧化都很好地相关。 CRA的抗热氧化老化性能随着CR用量的增加而提高。这进一步说明了老化促进了CR在沥青中的溶解。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43323。
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