A TOP HIGHWAY ENGINEER SURVEYS ASPHALT PAVEMENT DENSITY SPECS

CURRENT SPECIFICATIONS ARE REVIEWED FOR DENSITY CONTROL OF ASPHALT PAVEMENT. CONVENTIONAL METHODS FOR THE CONTROL OF ASPHALT PAVEMENT DENSITY ARE: (1) A RELATIVE COMPACTION REQUIREMENT, MEANING RATIO OF IN-PLACE DENSITY TO MAXIMUM TEST DENSITY OF MIX COMPACTED BY A SPECIFIC TEST METHOD, AND (2) A METHOD SPECIFICATION WHICH LIMITS THE TYPE AND WEIGHT OF COMPACTING EQUIPMENT AND NUMBER OF PASSES REQUIRED BY EACH UNIT. SPECIFICATIONS FOR ALL FIFTY STATES WERE REVIEWED. THEIR REQUIRMENTS FOR THE DESIGN AND CONTROL OF THE ASPHALTIC MIXTURES ARE SUMMARIZED IN A TABLE. VERY FEW STATES SPECIFY QUALITY CONTROL ON THE AGGREGATE REQUIREMENTS. ONLY SIXTEEN STATES SPECIFY SOME SORT OF STABILITY REQUIREMENT AS A MEASURE OF MIXTURE QUALITY. SOME OF THE PRIMARY FACTORS INFLUENCING THE COMPACTION OF ASPHALT PAVING MIXTURES ARE: (1) TEMPERATURE OF MIXTURE AT VARIOUS PHASES OF COMPACTION WITH EMPHASIS ON ADEQUATELY HIGH TEMPERATURE AT TIME OF INITIAL ROLLING, (2) AIR TEMPERATURE AS IT AFFECTS MIX TEMPERATURE, (3) GRADATION AND SHAPE CHARACTERISTICS OF AGGREGATES, (4) ASPHALT CONTENT OF THE MIXTURE, (5) DEPTH OF MIX, AND (6) COMPACTIVE ENERGY. RESULTS OF EXPERIMENTAL WORK USING NUCLEAR GAUGES FOR OBTAINING RELATIVE DENSITY INDICATE THAT THIS EQUIPMENT HAS A GREAT DEAL OF POTENTIAL AS A MEANS FOR DEVELOPING A PRACTICAL END RESULT-TYPE SPECIFICATION.

  • Supplemental Notes:
    • Vol 3, No 5, PP 116-124, 7 FIG, 2 TAB
  • Authors:
    • Gillis, L R
  • Publication Date: 1968-5

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  • Accession Number: 00211393
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 1994 12:00AM