LABORATORY STUDY OF THE EFFECTS OF RECYCLING MODIFIERS ON AGED ASPHALT CEMENT

An on-going research program to study the effects of recycling modifiers on aged asphalt cement is described. So far nine modifiers and one aged asphalt have been investigated. Blends of the modifiers and asphalt were tested chemically and physically in both an unaged condition and after aging in a rolling thin-film oven. Chemical characterization included clay-gel compositional analysis, solubility testing, and high pressure gel permeation chromatography. Physical testing included penetration, viscosity, and ductility testing. The results indicate that the influence of the polar to saturate ratio (P/S) on consistency may diminish with higher levels of aromatic fractions in the modifiers. Higher levels of P/S in the modifiers were also responsible for better properties on aging of the blends. Clay-gel results revealed that the compositional effects of modifiers are not additive in the blends. On aging, the blends increased in asphaltene content and decreased in polar content. Solubility test results revealed that the effects of different modifiers on aged asphalt can be detected. Solubility trends were also observed after aging of the blends. Blends with low aging indices were also found to have an increase in state of peptization after aging.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1984/968/968-008.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=LABORATORY+STUDY+OF+THE+EFFECTS+OF+RECYCLING+MODIFIERS+ON+AGED+ASPHALT+CEMENT&author=D.+Newcomb&author=B.+Nusser&author=B.+Kiggundu&author=D.+Zallen&publication_year=1984
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• Supplemental Notes:
  • 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. Publication of this paper sponsored by Committee on Characteristics of Bituminous Paving Mixtures to Meet Structural Requirements.
• Authors:
  • Newcomb, David E
  • Nusser, Betty J
  • Kiggundu, Badru M
  • Zallen, Dennis M
• Publication Date: 1984

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 66-77
• Monograph Title: Asphalt mixtures and performance
• Serial:
  • Transportation Research Record
  • Issue Number: 968
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Age; Asphalt cement; Chemical analysis; Laboratory studies; Pavements; Recycling; Solubility
• Uncontrolled Terms: Modifiers
• Old TRIS Terms: Pavement recycling; Peptization; Physical tests
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00394931
• Record Type: Publication
• ISBN: 0309037506
• Files: TRIS, TRB
• Created Date: Nov 30 1985 12:00AM