Abstract
Chemical functional groups such as carbonyls, sulfoxides and unsaturations are considered the most significant changes that occur in bitumen molecules with oxidation. Such transformations influence the mechanical and thermal responses of the material. This study aims to analyze the topic by means of producing highly oxidized bitumens to correlate oxidation indexes to rheological and thermodynamic parameters. The results showed that the chemical changes largely influence the rheological and thermal responses. It was found that the stronger interactions that bond the oxidized molecules cause the bitumen to exhibit a more glassy-like behavior, which is translated into higher crossover and lower glass transition temperatures. These findings highlight the importance of knowing the chemical composition of bitumen and how it changes through the materials’ service life to determine the temperatures at which the material is more susceptible to fatigue cracking.
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Baldi, A., Villegas-Villegas, R.E., Aguiar-Moya, J.P., Loria-Salazar, L.G. (2022). The Chemistry Behind Rheological and Thermal Transitions of Oxidized Bitumen. In: Di Benedetto, H., Baaj, H., Chailleux, E., Tebaldi, G., Sauzéat, C., Mangiafico, S. (eds) Proceedings of the RILEM International Symposium on Bituminous Materials. ISBM 2020. RILEM Bookseries, vol 27. Springer, Cham. https://doi.org/10.1007/978-3-030-46455-4_224
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DOI: https://doi.org/10.1007/978-3-030-46455-4_224
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