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1994•Transportation Research Record Journal of the Transportation Research BoardRequires access

EFFECT OF COMPOSITION ON ASPHALT RECYCLING AGENT PERFORMANCE

G D Peterson, Richard R. Davison, Charles J. Glover, Jerry A. Bullin

Open publisher page 38 citations

Abstract

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.

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What this paper is about

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.

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Available abstract

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.

Key concepts: Asphaltene, Wax, Asphalt, Hardening (computing), Fractionation, Materials science, Supercritical fluid, Chemical engineering

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