Resumo

VARGAS ARENAS, Xiomara Andrea; AFANASJEVA, Natalia  e  ALVAREZ CIFUENTES, Mario. Rheological model for sol-gel phase transition of thermo-aged heavy oil fractions. Ing. Investig. [online]. 2010, vol.30, n.1, pp.28-34. ISSN 0120-5609.

A power-law rheological model is proposed in this paper: G´´ (w) ~ wn and G´ (w) ~ wn. 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.

Palavras-chave : rheology; rheological model; asphalt; aging.

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