ASPHALT HARDENING IN EXTRACTION SOLVENTS

Hardening occurs in asphalts during extraction and recovery, posing a serious problem for research into the properties of hot-mix and road-aged asphalts. Hardening appears to occur in all solvents and, to varying degrees, in all asphalts. The effects of light, oxygen, and temperature on this phenomenon were investigated. All are significant, and the data indicate that reflux methods of extraction should be avoided when the properties of the extracted material are to be investigated. The mechanism of the hardening is still unclear. Infrared spectra show definite chemical changes, but these are quite asphalt-dependent and do not relate clearly to changes in viscosity.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1991/1323/1323-008.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=ASPHALT+HARDENING+IN+EXTRACTION+SOLVENTS&author=B.+Burr&author=R.+Davison&author=H.+Jemison&author=C.+Glover&author=J.+Bullin&publication_year=1991
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1323, Asphalt Mix Materials 1991. 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
  • Jemison, H B
  • Glover, C J
  • Bullin, J A
• Publication Date: 1991

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 70-76
• Monograph Title: Asphalt mix materials, 1991
• Serial:
  • Transportation Research Record
  • Issue Number: 1323
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt hardening; Chemical reactions; Infrared spectroscopy; Light; Oxygen; Solvents; Temperature; Tests; Viscosity
• Old TRIS Terms: Solvent extraction tests
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00622190
• Record Type: Publication
• ISBN: 0309051630
• Files: TRIS, TRB, ATRI
• Created Date: May 31 1992 12:00AM