Effect of composition on asphalt recycling agent performance
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Experiments have been conducted to determine the effect of metals, asphaltenes, and paraffins (oils and waxes) content on the properties of recycled aged asphalts. Recycling agents were produced by using a large Corbett type apparatus to fractionate asphalt fractions that had been previously separated from asphalt by supercritical fractionation. The material was separated into asphaltenes, aromatics, oils, and waxes, which were mixed in different ratios and blended with oxidized asphalts. The blends were then aged to study the composition effects during aging. In general, metals had little effect. Asphaltenes increase the hardening rate but not the oxidation rate. The effect of saturates depended on the asphaltene content. Waxes showed little, if any, effect on the measured properties. In general, highly aromatic recycling agents yielded material superior in the measured properties to the original asphalts.
Transportation Research Record
author list (cited authors)
Peterson, G. D., Davison, R. R., Glover, C. J., & Bullin, J. A.
complete list of authors
Peterson, GD||Davison, RR||Glover, CJ||Bullin, JA