SOLVENT REMOVAL FROM ASPHALT

Asphalt recoveries by the Abson and Roto-vap methods were performed at various temperatures and for several asphalt viscosities. Solvent (trichloroethylene, TCE) concentrations after recovery were measured by gel permeation chromatography. Asphalt viscosities and residual solvent concentrations during solvent removal were determined for tank, over-aged, and solvent-exposed asphalt to evaluate the effectiveness of the procedures and operating parameters. Small amounts of solvent cause significant decreases in viscosity, and present recovery methods do not remove solvent adequately. In general, recovery rates increase strongly with temperature in both methods. High viscosities and larger asphalt samples hinder solvent removal rates in the Abson method. Asphalt hardens significantly on extended exposure to TCE at both 200 deg F and 80 deg F. This hardening also occurs during solvent removal processes, but removal at a reduced temperature through use of a vacuum in the early stages can inhibit it.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1990/1269/1269-001.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=SOLVENT+REMOVAL+FROM+ASPHALT&author=B.+Burr&author=R.+Davison&author=C.+Glover&author=J.+Bullin&publication_year=1990
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1269, Asphalt Mix Materials and Mixtures 1990. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Burr, B L
  • Davison, R R
  • Glover, C J
  • Bullin, J A
• Publication Date: 1990

Media Info

• Features: Figures; References;
• Pagination: p. 1-8
• Monograph Title: Asphalt mix materials and mixtures, 1990
• Serial:
  • Transportation Research Record
  • Issue Number: 1269
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt hardening; Gel permeation chromatography; Measures of effectiveness; Methodology; Solvents; Temperature; Vacuum; Viscosity
• Uncontrolled Terms: Effectiveness; Recovery
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00602677
• Record Type: Publication
• ISBN: 0309050502
• Files: TRIS, TRB, ATRI
• Created Date: Dec 31 1990 12:00AM