PAVING ASPHALT; REDUCTION OF OXIDATIVE HARDENING OF ASPHALTS BY TREATMENT WITH HYDRATED LIME-A MECHANISTIC STUDY

This study showed that lime treatment removes polar, viscosity-building components and reduces the susceptibility of the asphalt to laboratory oxidative hardening. The beneficial effects of lime treatment in reducing asphalt oxidative hardening were attributed to two synergistic effects: (1) lime reduces the formation of oxidation products by the removal of oxidation catalysts or promoters and (2) lime reduces the sensitivity of the asphalt to these oxidation products by removing polar molecules that would otherwise interact with the oxidation products to cause an increase in viscosity. Relationships were observed between polar functional group interactions and changes in asphaltene content and viscosity.

• Supplemental Notes:
  • Prepared in cooperation with Arizona Dept. of Transportation, Phoenix. See also report dated Aug 76, PB-267 977.
• Corporate Authors:

  Energy Research and Development Administration

  Laramie Energy Research Center, P.O. Box 3395
  Laramie, WY  United States  82071

  Arizona Department of Transportation

  206 South 17th Avenue
  Phoenix, AZ  United States  85007

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Plancher, H
  • Green, E L
  • Petersen, J C
• Publication Date: 1977-4

Media Info

• Pagination: 39 p.

Subject/Index Terms

• TRT Terms: Additives; Aggregates; Aging (Materials); Asphalt; Asphalt content; Asphalt hardening; Asphalt pavements; Calcium hydroxide; Catalysts; Concrete hardening; Flexible pavements; Hardness; Oxidation; Viscosity
• Uncontrolled Terms: Interaction
• Old TRIS Terms: Polar compounds
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00175256
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FHWA-RD-77-147 Intrm Rpt., FCP 39A6-051
• Contract Numbers: P.O. No. 6-3-0031
• Files: NTIS, TRIS, USDOT, STATEDOT
• Created Date: Apr 26 1978 12:00AM