ASPHALT CONCRETE MIXING TIME

IN 1963 THE NEW YORK STATE DEPARTMENT OF PUBLIC WORKS SPONSORED A RESEARCH PROJECT AT CORNELL UNIVERSITY TO DETERMINE WHETHER THE TOTAL MIXING TIME OF 60 SECONDS, THEN REQUIRED BY THE SPECIFICATIONS FOR ASPHALT CONCRETE, COULD BE SHORTENED WITHOUT AFFECTING THE QUALITY OF THE MIXES. IF MIXING TIME COULD BE REDUCED LOWER COSTS WOULD RESULT FROM THE INCREASED PRODUCTION. BASED ON THE RESULTS OF 1963 AND 1964 STUDIES, THE DEPARTMENT ISSUED AN ADDENDUM TO THE 1962 SPECIFICATIONS ALLOWING A REDUCTION FROM THE FORMERLY SPECIFIED MINIMUM OF 15 SECONDS OF DRY MIXING /FROM START OF ADDING AGGREGATES/ FOLLOWED BY 45 SECONDS OF WET MIXING /FROM START OF ADDING ASPHALT/. THE ADDENDEM PERMITS A REDUCTION IN TOTAL MIXING TIME IF SPECIALIZED REQUIREMENTS ARE MET' BASE COURSE SHALL BE DRY MIXED FOR AT LEAST THE TIME NECESSARY TO CHARGE ALL AGGREGATES AND WET MIXED UNTIL 90 PERCENT OF COARSE AGGREGATES ARE FULLY COATED OR FINISH MIXING TIME EXCEEDS 10 SECONDS, WHICHEVER IS LONGER. TOP AND BINDER COURSE SHALL BE DRY MIXED FOR AT LEAST THE TIME NECESSARY TO CHARGE ALL AGGREGATES OR 10 SECONDS, WHICHEVER IS LONGER. IT SHALL THEN BE WET MIXED UNTIL 95 PERCENT OF COARSE AGGREGATES ARE FULLY COATED OR FINISH MIXING TIME EXCEEDS 10 SECONDS, WHICHEVER IS LONGER. IN NO CASE SHALL THE CYCLE TIME BE SO SHORT AS TO RESULT IN A RATE OF PRODUCTION EXCEEDING THE OPERATING CAPACITIES OF THE PLANT. /AUTHOR/

  • Supplemental Notes:
    • Phys Res RePT RR 65-8, VAR PAGED
  • Corporate Authors:

    New York State Department of Transportation

    1220 Washington Avenue
    Albany, NY  United States  12232
  • Authors:
    • Thomas, J J
    • Dixon, W C
    • Clark, W H
  • Publication Date: 1965-11

Subject/Index Terms

Filing Info

  • Accession Number: 00212402
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Jul 21 1994 12:00AM