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Rheological model for sol-gel phase transition of thermo-aged heavy oil fractions
Modelo reológico para la transición de fase sol-gel de fracciones pesadas del petróleo termoenvejecidas
DOI:
https://doi.org/10.15446/ing.investig.v30n1.15203Keywords:
rheology, rheological model, asphalt, aging (en)reología, modelo reológico, asfalto, envejecimiento (es)
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A power-law rheological model is proposed in this paper: G’’(ω) ~ ωn and G’(ω) ~ ωn. It represents the increased connectivity between thermo-aged asphalt molecules in a rheo-reactor as one of the applications of systematic rheology. The results confirmed a sol-gel phase transition tendency for aged asphalt in the experimental frequency window at temperatures below 40°C. Such pattern could have been related to the structuring effect arising from the thermo-oxidative asphalt aging process during continuous agitation which has been suitably described by the micellar model of asphalt.
En este artículo se propone un modelo reológico tipo ley de potencia: G’’(ω) ~ ωn y G’(ω) ~ ω n, que representa el incremento de la conectividad entre las moléculas de asfalto termoenvejecido de manera in situ en un reo-reactor, como una de las aplicaciones de la reología sistemática. Los resultados encontrados confirmaron la tendencia de una transición de fase sol-gel a temperaturas menores a 40 °C de los asfaltos envejecidos en la ventana de frecuencia experimental, comportamiento que puede relacionarse con el efecto "estructurante" que le proporciona el proceso de envejecimiento termooxidativo al asfalto durante agitación continua, el cual es adecuadamente descrito por el modelo micelar del asfalto.
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Copyright (c) 2010 Xiomara Andrea Vargas Arenas, Natalia Afanasjeva, Mario Álvarez Cifuentes
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