LONG-TERM OVEN-AGING EFFECTS ON FATIGUE AND INITIAL STIFFNESS OF ASPHALT CONCRETE

An investigation of the effects of long-term oven aging (LTOA) on initial stiffness and fatigue of asphalt concrete was made using two typical California asphalts, known to have different aging characteristics, in mixes with one aggregate. Asphalt content, air-voids content, and days of LTOA were varied independently. Stiffness and fatigue were evaluated using the controlled-strain flexural beam test developed by the Strategic Highway Research Program Project A-003A. The results indicated that both mixes exhibited an increase in initial stiffness with LTOA periods of up to six days. The sensitivity of beam fatigue life to LTOA depended on the asphalt. Beams containing Valley asphalt had virtually no change in fatigue life due to LTOA, whereas beams with Coastal asphalt showed some sensitivity to LTOA. For both asphalts, the average reduction in fatigue life from 6 days of LTOA was less than that caused by a 3% increase in air-void content or a 1% decrease in asphalt content. Simulations of thick and thin pavement structures were performed to reconcile the effects of LTOA, asphalt content, and air-void content on mix fatigue life and stiffness by evaluating their combined effects on predicted pavement fatigue life. The simulations indicated that aging, as induced by LTOA, increased fatigue life for all cases except one.

• Record URL:
  • https://doi.org/10.3141/1590-11
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=LONG-TERM+OVEN-AGING+EFFECTS+ON+FATIGUE+AND+INITIAL+STIFFNESS+OF+ASPHALT+CONCRETE&author=J.+Harvey&author=B.+Tsai&publication_year=1997
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061636
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1590, Asphalt Mixture Quality, Characteristics, and Performance.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Harvey, J
  • 0000-0002-8924-6212
  • Tsai, B-W
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 89-98
• Serial:
  • Transportation Research Record
  • Issue Number: 1590
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Air voids; Asphalt concrete; Asphalt content; Beams; Concrete tests; Flexural strength; Mechanical fatigue; Oven drying; Stiffness; Structural tests; Time duration
• Identifier Terms: Strategic Highway Research Program
• Uncontrolled Terms: Fatigue life
• Old TRIS Terms: Air voids content; Long term oven aging
• Subject Areas: Bridges and other structures; Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00743194
• Record Type: Publication
• ISBN: 0309061636
• Files: TRIS, TRB, ATRI
• Created Date: Nov 24 1997 12:00AM