01324880

Component

https://doi.org/10.3141/2179-05

http://scholar.google.com...imes&publication_year=2010

Four asphalts used in field pavements were aged at a laboratory in a pressure-aging vessel (PAV) at several temperatures for various lengths of time. The chemical (infrared spectra) and rheological properties of these aged asphalts were compared. Results showed that the same PG graded asphalts from different crude sources had significant differences in their rheological behavior and chemical properties after long-term oxidative aging. Asphalt per se had approximately the same aging rheological pattern regardless of aging temperature. Laboratory PAV aging at 80°C for 504 h was found to produce stiffer material than the same material subjected to the same PAV aging at 100°C for 100 h. The plot of G* complex modulus versus phase angle was found particularly useful for characterizing the asphalt binder rheology in terms of long-term aging characteristic. Additionally, the aging shift factor, generated from the aging master curve, was used to characterize the modulus changes with respect to aging and to compare effects of aging on different materials. Furthermore, results indicated a linear relationship between the change of rheological property and the change of chemical property (carbonyl index) with respect to long-term aging. It was verified that sulfoxide was formed easily with aging. However, sulfoxides also decomposed at longer aging times.

01324883

10-2296

English

pp 39-48

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160520

Print

Figures (8) ; References (22)

Aging (Materials); Bituminous binders; Chemical properties; Laboratory tests; Rheological properties; Sulfur oxides; Temperature

Complex modulus; Pressure aging vessels

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 11 2011 9:47AM

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