FLOW BEHAVIOR OF ASPHALT CEMENTS

CREEP CURVES BASED ON DATA OBTAINED WITH A ROTATING COAXIAL CYLINDER VISCOMETER WERE USED TO OBTAIN ELASTIC MODULI, YIELD STRESSES, COEFFICIENTS OF PLASTIC VISCOSITY, AND VISCOELASTIC PARAMETERS FOR 13 ASPHALTS AT 39.2 DEGREES F, 77 DEGREES F, AND 104 DEGREES F. TEST PROCEDURE, CURVE- FITTING TECHNIQUE, COMPUTER PROGRAMMING FOR OBTAINING VISCOELASTIC MATERIAL PARAMETERS AND VISCOELASTIC ANALYSES OF DATA ARE DISCUSSED IN APPENDICES TO THE RPT. AMONG SOME OF THE CONCLUSIONS OF THE RESEARCHERS ARE THE FOLLOWING: (1) THE CURVE-FITTING TECHNIQUE FOR EVALUATING THE PARAMETERS OF VISCOELASTIC BEHAVIOR HAS PROVEN TO BE EXTREMELY USEFUL AND RELIABLE, (2) ALL THE ASPHALT CEMENTS EXHIBITED STEADY-STATE FLOW BEHAVIOR AT 77 DEGREES F AND 104 DEGREES F AND THEIR FLOW BEHAVIOR UNDER CREEP LOADING COULD SATISFACTORILY BE CHARACTERIZED BY THAT OF A BINGHAM PLASTIC. AT 39.2 DEGREES F, ALL ASPHALTS EXHIBITED INSTANTANEOUS AND RETARDED ELASTICITY, STEADY-STATE FLOW SIMILAR TO THAT OF A BINGHAM PLASTIC AND ELASTIC RECOVERY FOLLOWING LOAD REMOVAL, (3) COEFFICIENT OF PLASTIC VISCOSITY POISES WERE OBTAINED FOR THE ASPHALTS WITH THE VISCOMETER OF THE VARIOUS TEST TEMPERATURES. THERE WAS NO DISCERNABLE RELATIONSHIP OBSERVED BETWEEN YIELD STRESS AND COEFFICIENT OF PLASTIC VISCOSITY, (4) THE TIME-TEMPERATURE SUPERPOSITION PRINCIPLE APPEARS TO BE APPLICABLE TO THE BEHAVIOR OF NORMAL ASPHALT CEMENTS AT LEAST IN THE LOW-TEMPERATURE RANGE, (5) A RELATIONSHIP EXISTS BETWEEN PLASTIC VISCOSITY AND PENETRATION, BOTH EVALUATED AT THE SAME TEMPERATURE. THE CORRELATION AT 77 DEGREES F IS SUPERIOR TO THAT AT 39.2 DEGREES F, (6) THERE IS AN INDICATION THAT ASPHALTS OBTAINED FROM THE SAME CRUDE SOURCE WITH SIMILAR REFINING PROCESSES WILL HAVE SIMILAR TEMPERATURE SUSCEPTIBILITIES, AND (7) DIFFERENCES IN TEMPERATURE SUSCEPTIBILITIES OF THE VARIOUS ASPHALTS NECESSITATE THE SPECIFYING OF THE CONSISTENCY OF ASPHALT CEMENTS AT MORE THAN ONE TEMPERATURE LEVEL. /BPR/

  • Record URL:
  • Supplemental Notes:
    • Hpr-1/2/, BPR NO 13, STATE KYHPR 64-20
  • Corporate Authors:

    Kentucky Department Highways

    ,    
  • Authors:
    • Mossbarger, W A
    • Deacon, J A
  • Publication Date: 1967-5

Subject/Index Terms

Filing Info

  • Accession Number: 00210377
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Feb 6 1994 12:00AM