The author of this paper evaluates the logistic differential equation as a mathematical method for representing changes in asphalt properties during pavement aging in the field. The logistic function was selected because it is theoretically consistent with the micromolecular model of asphalt aging. This choice was validated when the logistic function gave a close fit with experimental data from a variety of pavement-aging studies. The logistic function made the quantification of two essential characteristics of asphalt aging possible: the rate of aging and the ultimate degree of change in asphalt properties due to aging. The logistic equation can be a powerful tool for studying asphalt aging, because it provides a method for consolidating aging data in an accurate and useful format. This tool allows for the study of the relative effects on the aging process of factors such as asphalt type, void level, and climate. An understanding of the role of asphalt type on the aging process is essential in developing more durable asphalt pavements.


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  • Accession Number: 00713724
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 5 1995 12:00AM