RATES OF ASPHALT HARDENING AT IN-SERVICE TEMPERATURES

RATES OF ASPHALT HARDENING AT IN-SERVICE PAVEMENT TEMPERATURES WERE STUDIED IN THE LABORATORY TO DETERMINE THE EFFECT OF THIS FACTOR ON THE DURABILITY OF ASPHALTIC CONCRETE PAVEMENTS. SAMPLES OF A SOL, A SOL-GEL, AND A GEL ASPHALT, ALL WITHIN THE PENETRATION RANGE 85 TO 100, WERE TESTED AT TEMPERATURES OF 60, 100, 140, AND 200 F, AT FOUR EXPOSURE-TIME INTERVALS INCREASING FROM 0 TO 28 DAYS. CHANGES IN ASPHALT CONSISTENCY WERE MEASURED BY CHANGES IN APPARENT ABSOLUTE VISCOSITY AND CHANGES IN PERCENTAGE OF ASPHALTENES. THE METHOD OF VISCOSITY ANALYSIS WAS BASED ON BROWN, SPARKS, AND LARSON'S THEORY THAT THE CHANGE IN TEST VALUE WITH TIME FOLLOWS A SIMPLE HYPERBOLIC LAW. TEST RESULTS INDICATED THAT THE RATE OF CHANGE OF APPARENT ABSOLUTE VISCOSITY DEPENDS ON TEMPERATURE, REGARDLESS OF ASPHALT TYPE, AND THAT THE FORMATION OF ASPHALTENESS, AFTER A PERIOD OF FOUR OR FIVE DAYS, IS INDEPENDENT OF ASPHALT TYPE AND TEMPERATURE. THOUGH THE DATA FOR RATE OF CHANGE IS SIMILAR FOR THE THREE ASPHALTS, A SOL ASPHALT APPEARS TO HAVE THE BEST HARDENING CHARACTERISTICS FOR PAVEMENT DURABILITY. /AUTHOR/

  • Supplemental Notes:
    • Eng Res BulL B-100, 48 PP
  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  USA  16802
  • Authors:
    • Gotolski, W H
    • Ciesielski, S K
    • Smith, R W
  • Publication Date: 1969-12

Subject/Index Terms

Filing Info

  • Accession Number: 00211475
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 19 1970 12:00AM