Asphalt hardening in five bituminous concrete mixes was studied after storing at elevated temperatures for periods of 18 to 24 hours in both inert gas and normal atmospheres. Asphalts extracted from the loose mixes before and after storage, and from compacted mixes at the time of placement and after up to 4 years of service, were tested for penetration (77 F), absolute viscosity (140 F) and kinematic viscosity (275 F). Asphalts from the three fine, dense-graded to course mixes (inert gas for 18 hr, inert gas for 48 hr, and normal atmosphere for 24 hr) were not altered by storage, but delayed hardening was measured in one mix after 1 year of service and another after 3 years. No explanation for the hardening was apparent and pavement performance was not affected. Asphalts from the more open-graded base and binder course mixes hardened significantly during storage. These differences persisted through 4 years of service in one of the mixes but disappeared after 3 years in the other. /FHWA/

  • Supplemental Notes:
    • Sponsored by and prepared in cooperation with the Federal Highway Administration, DOT.
  • Corporate Authors:

    New York State Department of Transportation

    Engineering Research and Development Bureau, 1220 Washington Avenue
    Albany, NY  United States  12232
  • Authors:
    • Brown, R A
    • Miller, R W
    • Chamberlin, W P
  • Publication Date: 1977-7

Media Info

  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00165766
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-NY-77-SSN83-1,, RR 54
  • Contract Numbers: FCP 40M1-184
  • Created Date: Mar 29 2003 12:00AM