A STUDY OF VARIABILITY IN PRODUCTION SAMPLING AND TESTING BITUMINOUS CONCRETE BASE

THIS PROJECT CONSISTED OF STATISTICALLY SAMPLING AN OPEN- GRADED HOT BITUMINOUS BASE MIXTURE PRODUCED IN A BATCH TYPE HOT-MIX PLANT. FIFTY RANDOM SAMPLES WERE TAKEN AT THE PLANT SITE DURING PRODUCTION, AND FIFTY SAMPLES WERE OBTAINED FROM SAME LOADS AFTER THEY WERE PLACED ON THE ROADWAY AND PARTIALLY ROLLED. THE RESULTS OF THIS STUDY WHEN COMPARED WITH PREVIOUS STUDIES INDICATED THAT PLANT PRODUCTION VARIANCES WERE MUCH SMALLER AND THE SAMPLING AND TESTING VARIANCES WERE LARGER. THE STUDY INDICATED THE SPECIFIED TOLERANCES FOR THE 3/4 INCH SIEVE OF 7% ARE UNREALISTIC. THE 50 ROADWAY SAMPLES SHOULD HAVE CORRESPONDED WITH 50-TRUCK SAMPLES, BUT THE RESULTS INDICATED THEY DID NOT REPRESENT THE SAME POPULATION. THE ROADWAY SAMPLES SHOWED LESS FINES AND LESS ASPHALT THAN THE SAMPLES TAKEN FROM THE TRUCKS AT THE PLANT. /AUTHOR/

  • Supplemental Notes:
    • Hpr, Bpr-67-8B
  • Corporate Authors:

    Maine State Highway Commission

    Materials and Research Division, Bureau of Highways
    Augusta, ME  United States  04330
  • Authors:
    • French, R
    • EDWARDS, B
  • Publication Date: 1967-9

Subject/Index Terms

Filing Info

  • Accession Number: 00214462
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jan 8 1994 12:00AM