EFFECTS OF VISCOSITY CONTROL OF TAR ON MARSHALL STABILITY TEST VALUES OF TAR CONCRETE

THIS LABORATORY STUDY INVESTIGATED THE EFFECTS OF EMPLOYING VISCOSITY CONTROL IN ESTABLISHING TEMPERATURES FOR MIXING AND COMPACTING UPON THE MARSHALL STABILITY TEST VALUES OF TAR CONCRETE. TWO ROAD TARS OF RT-12 GRADE WERE INVESTIGATED, ONE BEING A COKE-OVEN TAR AND THE OTHER AN OIL -GAS TAR. THE TEMPERATURE VISCOSITY RELATIONSHIPS WERE DETERMINED FOR THE TWO TARS. MIXING TEMPERATURES AND COMPACTING TEMPERATURES FOR MARSHALL STABILITY TEST SPECIMENS WERE ESTABLISHED BY MEANS OF THE TEMPERATURE- VISCOSITY CURVE FOR EACH TAR IN ACCORDANCE WITH THE 1960 ASTM D 1559-60 T, AND MARSHALL TEST SPECIMENS WERE MOLDED AND TESTED. MARSHALL TEST SPECIMENS WERE ALSO MOLDED AND TESTED USING THE TEMPERATURES FOR MIXING AND COMPACTING AS REQUIRED BY THE OLD 1958 ASTM METHOD D 1559-58 T. THE VISCOSITY CONTROL PROCEDURE SPECIFIED IN THE 1960 TEST METHOD REQUIRED A LOWER MIXING TEMPERATURE AND A CONSIDERABLY HIGHER COMPACTING TEMPERATURE THAN THOSE REQUIRED IN THE 1958 METHOD. THE EFFECTS OF THESE CHANGES ON MARSHALL TEST VALUES ARE REPORTED. REASONS FOR THESE DIFFERENCES IN VALUES ARE DISCUSSED AND RECOMMENDATIONS ARE MADE. /NAPA/

  • Supplemental Notes:
    • Vol64, Pp968-980
  • Authors:
    • Bahri, G R
    • Rader, L F
  • Publication Date: 1964

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Filing Info

  • Accession Number: 00210295
  • Record Type: Publication
  • Source Agency: National Asphalt Pavement Association (NAPA)
  • Files: TRIS
  • Created Date: Mar 8 1994 12:00AM