EFFECT OF ASPHALT AGING ON THE FATIGUE PROPERTIES OF ASPHALT CONCRETE

A LABORATORY STUDY OF THE EFFECT OF ASPHALT AGING ON THE FATIGUE PROPERTIES OF ASPHALT CONCRETE HAS BEEN CONDUCTED. FATIGUE TESTS USING ARTIFICIALLY AGED ASPHALTS WITH PENETRATION VALUES OF 63, 53, 37, AND 15 /AFTER MIXING/ AND REFINERY-PRODUCED UNAGED ASPHALTS WITH PENETRATION VALUES OF 65, 48, 28, AND 9 /AFTER MIXING/ WERE CARRIED OUT UNDER CONSTANT BENDING STRESS LOAD CONDITIONS AT ONE TEMPERATURE AND ONE RATE OF LOADING. THE FATIGUE TEST RESULTS FOR EACH ASPHALT WERE INTERPRETED WITH THE AID OF LAYERED THEORY FOR THREE TYPICAL ROADWAY STRUCTURAL SECTIONS. THE VARIABLES INCLUDED IN THIS ANALYSES WERE SURFACE STIFFNESS, BASE STIFFNESS, AND SURFACE AND BASE THICKNESS. THE RESULTS OF THE INTERPRETATION INDICATED THAT ARTIFICIALLY AGED ASPHALTS IMPART BETTER FATIGUE PROPERTIES TO ASPHALT CONCRETE THAN UNAGED ASPHALTS AT COMPARABLE CONSISTENCIES. IN ADDITION, IT WAS SHOWN THAT FOR EQUIVALENT PAVEMENT DESIGNS' /1/ THE ESTIMATED NUMBER OF REPETITIONS TO FAILURE INCREASES WITH INCREASING SURFACE STIFFNESS FOR BOTH THE AGED AND UNAGED ASPHALTS, /2/ THE ESTIMATED NUMBER OF REPETITIONS TO FAILURE INCREASES WITH INCREASING BASE MODULUS FOR BOTH AGED AND UNAGED ASPHALTS, AND /3/ THE ESTIMATED NUMBER OF REPETITIONS TO FAILURE INCREASES AS THE THICKNESS OF THE SURFACE LAYER INCREASES FOR BOTH AGED AND UNAGED ASPHALTS. /AUTHOR/

• Supplemental Notes:
  • Preprint VoL, PP 484-510, 12 FIG, 10 TAB, 18 REF
• Authors:
  • Vallerga, B A
  • Finn, F N
  • Hicks, R G
• Conference:
  • Intl Conf Struct Design Asphalt Pvmts
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt concrete; Bending; Bending stress; Fatigue (Mechanics); Fatigue tests; Laboratory studies; Stiffness; Stresses; Thickness
• Uncontrolled Terms: Fatigue life
• Old TRIS Terms: Aging
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 00210671
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 15 1994 12:00AM