DETERMINATION OF STATISTICAL PARAMETERS FOR BITUMINOUS CONCRETE

THIS REPORT DOCUMENTS A RESEARCH PROJECT CONDUCTED TO OBTAIN RELIABLE INFORMATION REQUIRED FOR THE PREPARATION OF REALISTIC SPECIFICATIONS FOR BITUMINOUS CONCRETE MIXTURES AND PAVEMENTS. THE WORK INVOLVED THE STATISTICAL ANALYSES OF DATA FROM TWO SOURCES: (1) HISTORICAL DATA CONSISTING OF ABOUT 4600 MEASUREMENTS OF RANDOM SAMPLINGS OF PAVING MIXTURES AT THE JOB SITE DURING 1968 AND 1969 AND (2) DATA OBTAINED FROM A SERIES OF STATISTICALLY DESIGNED EXPERIMENTS AND A RELATED INSPECTOR'S SAMPLING PROGRAM, INVOLVING ABOUT 6600 MEASUREMENTS OF NORMAL MATERIALS AND ROUTINE CONSTRUCTION. A STATIC CALLED THE CONFORMAL INDEX WAS COMPUTED FROM THE HISTORICAL MEASUREMENTS OF THE ASPHALT CONTENT AND THE PERCENTAGES PASSING ALL SPECIFICATION SIEVES FOR BOTH WEARING AND BINDER COURSES. THIS STATISTIC IS A MEASURE OF PROCESS CAPABILITY AND WAS EMPLOYED TO ESTIMATE THE SIZE AND INCIDENCE OF DEVIATIONS FROM THE APPROVED JOB-MIX FORMULA OF PAVEMENTS NOW IN SERVICE. DATA FROM THE DESIGNED EXPERIMENTS AND INSPECTOR'S SAMPLING PROGRAM WAS PRINCIPALLY USED TO ESTIMATE THE RELATIVE SIZES OF THE COMPONENTS OF VARIANCE OF MEASUREMENTS FROM THEIR AVERAGE. MEASUREMENTS INVESTIGATED INCLUDED THE ASPHALT CONTENT AND GRADATION OF WEARING AND BINDER COURSE MIXTURES MARSHALL PROPERTIES AND PAVEMENT DENSITY. SUMMARIES OF THE RESULTS OF THE VARIOUS ANALYSES WERE UTILIZED IN THE DETERMINATION OF REALISTIC NUMERICAL LIMITS AND IN THE PREPARATION OF A NEW TYPE SPECIFICATION WITH AN ASSOCIATED STATISTICAL SAMPLING PLAN. /FHWA/

  • Supplemental Notes:
    • Contract No 41018
  • Corporate Authors:

    Pennsylvania Department of Transportation

    Bureau of Materials, Testing and Research, 1118 State State
    Harrisburg, PA  United States  17112

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Hudson, S B
    • Higgins, F T
    • Bowery, F J
  • Publication Date: 0

Media Info

  • Pagination: 228 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00210485
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Fn Res Rep
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 9 1973 12:00AM