Effects of Physicochemical Factors on Asphalt Agingby J. Claine Petersen, Western Research Inst, United States,
Document Type: Proceeding Paper
Part of: Serviceability and Durability of Construction Materials
A new model for asphalt oxidative aging is presented. The model proposes that the kinetics of low temperature aging in the pavement temperature range is largely governed by physicochemical effects related to the state of dispersion of the associated or micellar components of asphalt rather than the inherent reactivity of the components with oxygen. The model is supported by a variety of data from present and past laboratory and field experiments, and is consistent with and supported by the time-tested micellar model of asphalt. The findings presented suggest two pragmatic consequences with regard to the aging of pavements: 1) the level of age hardening in pavements should be strongly influenced by the maximum pavement temperatures experienced in a given climate, and 2) currently used high-temperature aging tests may be poor indicators of pavement aging characteristics.
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