Isolation of waxes from asphalts and the influence of waxes on asphalt rheological properties
Conference
·
OSTI ID:215063
- Western Research Institute, Laramie, NY (United States)
Asphalts are composed of a wide variety of compound types, ranging from involatile aliphatic compounds to relatively polar aromatics. The two extremes of compound types may be expected to influence asphalt physical properties differently. Eight asphalts have been separated into neutral, acidic, and basic components by ion exchange chromatography. Waxes were isolated from the neutral fractions by solvent precipitation. Some of the asphalts contain very small amounts of waxes, but others contain substantial amounts, as defined by solvent precipitation. Several asphalts were combined with wax fractions at the 5 mass % level. In some cases, the waxes were those indigenous to the asphalts with which they were mixed. In others, asphalts were mixed with waxes derived from other asphalts. Rheological measurements were performed on the mixtures and compared with data for control asphalts. In some cases, adding waxes to asphalts proved to be viscosity-enhancing, but waxes from one asphalt exhibited a large viscosity-reducing effect.
- OSTI ID:
- 215063
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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