ELIMINATION CHEMISTRY IN ASPHALT. IN: AMERICAN CHEMICAL SOCIETY SYMPOSIUM ON CHEMISTRY AND CHARACTERIZATION OF ASPHALTS, AUGUST 1990, WASHINGTON, D.C.

The objective of this study was to determine the feasibility of modifying asphalt AAK-2 and AAM-2 by elimination reactions. The dehydrohalogenation reaction and the dealkylation reaction were investigated. Brominated asphalt AAK-2 and AAM-2 can be produced via free-radical chain reaction. The dehydrobrominated asphalt AAM-2 showed an increase in large molecular size (LMS) materials, no elastic recovery and an increased ESR free radical signal intensity. However, the dehydrobromination modified asphalt AAK-2 showed an increase in elastic recovery compared to the original asphalt. In this case, no increase in the ratio of the ESR signal intensity of vanadyl porphyrins to free radicals was observed. The dealkylation reaction modified asphalt AAK-2 showed an increased elastic recovery and a weight average molecular weight reduction, due to its high sulfur and nitrogen content. The feasibility of modifying asphalt AAK-2 and AAM-2 was successfully demonstrated. The results obtained here not only provide methods for chemically modifying asphalt but also provided information on oxidation reactions of asphalt.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08843759
• Corporate Authors:

  Marcel Dekker, Incorporated

  270 Madison Avenue
  New York, NY  United States  10016
• Authors:
  • Wang, I-H
  • Boucher, J L
  • Romine, R A
  • Rowlett, R D
  • Lei, G-D
  • Martinez, D F
• Publication Date: 1992-5

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 475-500
• Serial:
  • FUEL SCIENCE & TECHNOLOGY INTERNATIONAL
  • Volume: 10
  • Issue Number: 4
  • Publisher: Marcel Dekker, Incorporated
  • ISSN: 0884-3759

Subject/Index Terms

• TRT Terms: Asphalt; Bromine; Chemical composition; Chemical properties; Chemical reactions; Elasticity (Mechanics); Molecular weight; Oxidation; Rebound
• Old TRIS Terms: Elastic rebound
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00626031
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 19 1993 12:00AM