Evaluation of oxidation products generated in long term field-aged bitumen
14 Oct 2016-pp 339-348
Abstract: Long life bituminous pavement is widely pursed. The change of bitumen properties after long term field aging, however, often receives little attention. Particularly missing are oxidative aging mechanisms and oxidation products generated in sufficient long term field aging conditions. Bitumen binders studied in this paper were extracted from Hong Kong field pavement which has served for 36 years. In addition, four strategic highway research program (SHRP) bitumen binders were artificially aged to simulate long term oxidative aging. The bitumen binders extracted from field as well as their asphaltene components were examined by using Fourier Transform Infrared spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). The artificially aged bitumen binders were subject to analysis by using FTIR. Main oxidation products in different bitumen components were analyzed. The relationships between ketone, alcohol and the corresponding dynamic viscosity were investigated. Alcohol was proven to be a significant long term aging product but not seriously affect the dynamic viscosity of field-aged bitumen.
Abstract: Different methods have been developed to assess fatigue cracking of asphalt mixtures based on dissipated energy. Most of these methods have been motivated by the need to develop a unified fatigue criterion that is independent of the mode of loading. This paper offers critical analyses of the energy methods based on their theoretical ability to: (1) unify the results from controlled-strain and controlled-stress modes of testing for the same material; and (2) accurately assess the fatigue cracking life of different materials. The efficacy of these methods is quantitatively compared using a common set of fatigue test data. The fatigue test data were obtained using the dynamic mechanical testing of three different mixtures that have been shown to exhibit different fatigue cracking resistance in the field.
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