United States Department of Transportation
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Design and Use of Superior Asphalt Binders
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1992-08-01
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[PDF-5.94 MB]
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Edition:Final Report September 1, 1990 August 31, 1991
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Abstract:This study is a continuation of Study 1155 whose major objective was to use super critical fractionation of asphalt to study the effect of asphalt composition changes on properties and to use this knowledge to reblend fractions to make superior asphalts. In this study both supercritical cyclohexane and supercritical pentane have been used to fractionate three reduced crudes and the corresponding AC-20 asphalts into a range of fractions. Because it is not possible to evaluate an asphalt without its long-term road aging characteristics, and because no satisfactory road aging simulation existed, a major effort in this study became the development of a satisfactory aging procedure. It is shown that no aging test run at a single elevated temperature can predict performance at road temperature. Methods are given for predicting low temperature aging from values measured at several higher temperatures. It is shown that the aging characteristics of asphalt can be broken into two parts: the rate of oxidation as measured by carbonyl formation and the susceptibility of the viscosity to increase due to this carbonyl formation. Data indicate that the latter may be primarily a function of compatibility. The relation between viscosity change and carbonyl growth is highly correlated for each asphalt.
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