EFFECT OF DEGREE OF AGING ON CREEP AND RELAXATION BEHAVIOR OF SAND-ASPHALT MIXTURES

PREVIOUS WORK ON THE STUDY OF AGING IS REVIEWED. THE CREEP PARAMETERS OF MIXTURE VISCOSITY AND MODULUS OF RECOVERY DEVELOPED BY WOOD AND GOETZ WERE SELECTED FOR USE IN COMPARING THE CREEP CHARACTERISTICS OF THE AGED AND UNAGED MIXES. A 60-70 PENETRATION ASPHALT WAS USED. OTTAWA SAND OF MAXIMUM SIZE NO. 16 WAS USED AS AGGREGATE. THE GRADATION WAS WITHIN THE LIMITS OF ASTM DESIGNATION' D 1663-59T. THREE DIFFERENT MIXES WERE MADE WITH 9, 12, AND 15 PERCENT ASPHALT CONTENT BY WEIGHT OF AGGREGATE. THREE DEGREES OF AGING WERE USED' 77 F /UNAGED/, 140 F, AND 225 F FOR 1 WK. SPECIMENS, 3.5 CM IN DIAMETER AND 7 CM HIGH, WERE MADE AND TESTED IN CREEP AND RELAXATION. MAXIMUM CREEP STRAIN WAS LIMITED TO 1.2 PERCENT AND THE RELAXATION STRAIN WAS 1.4 PERCENT. THE RATE OF CREEP GENERALLY DECREASED WITH INCREASE IN THE DEGREE OF AGING. WITH THE HIGHER ASPHALT CONTENT MIXES, THE DIFFERENCE IN THE CREEP RATES WAS LESS MARKED. THE MAXIMUM RELAXATION LOAD INCREASED WITH AGING. FOR THE PARTICULAR RESULTS OBTAINED, A SEMILOG RELATION WAS DEVELOPED SHOWING THE VARIATION OF MIXTURE VISCOSITY WITH THE DEGREE OF AGING. A SIMILAR EXPRESSION WAS DEVELOPED RELATING THE MAXIMUM RELAXATION LOAD TO THE DEGREE OF AGING. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 105-123
  • Monograph Title: Surface treatments, bituminous mixtures and pavements
  • Serial:

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Filing Info

  • Accession Number: 00210276
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 29 1994 12:00AM