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Characterization of aging effect on rheological properties of asphalt-filler systems

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Two different types of mineral fillers were mixed with two different grades of asphalt binders to investigate the effect of filler surface on the rheological properties with respect to their long-term aging characteristics. The rheological properties of unaged and aged asphalt-filler systems were studied as a function of aging time. Different modeling techniques were evaluated to construct the aging master curves to investigate the effect of fillers on the long-term aging characteristics of asphalt binders. The results indicate that the generalized power law model can be successfully used to characterize the aging time-temperature effects for asphalt mastics. The results also indicate that the Williams-Landel-Ferry (WLF) model can be used to develop the aging shift factors. In addition, the aging master curves of asphalt-filler systems were also developed to characterize the effect of fillers on the aging kinetic curves of asphalt binders. Furthermore, the results show that stiffness effect of asphalt-filler reduced with aging.

Keywords: Asphalt mastic; Modeling; Physico-chemical interaction; Rheological property

Document Type: Research Article


Affiliations: 1: Western Research Institute, Laramie, WY, USA 2: College of Civil Engineering, The Hunan University, Changsha, Hunan, People's Republic of China

Publication date: 2007-09-01

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