STUDY OF ERRORS IN THE INSPECTION SAMPLING OF GRAVEL AGGREGATE

AN ERROR STUDY IN FIELD TESTING OF COARSE GRAVEL AGGREGATE TO DETERMINE GRADING AND PERCENTAGE OF DELETERIOUS PARTICLES WAS MADE. THE MAJOR TYPES OF ERROR STUDIED WERE SAMPLING ERROR, INSPECTOR BIAS, AND PICKING ERROR. A COMPUTER SIMULATION TECHNIQUE WAS USED TO DETERMINE IDEAL RANDOM SAMPLING RESULTS AS A BASIS FOR COMPARISON. INSPECTOR BIAS AND PICKING ERROR DEPENDED ON AGGREGATE TYPE. GRADING ERROR WAS FOUND TO BE SIGNIFICANTLY HIGHER THAN ERROR OBTAINED FROM SIMULATED RANDOM SAMPLING. IT WAS CONCLUDED THAT NEARLY ALL VARIATIONS BETWEEN TRUCK LOADS WERE DUE TO SAMPLING AND INSPECTION ERRORS RATHER THAN REAL DIFFERENCES IN COMPOSITION. VARIOUS METHODS OF REDUCING SAMPLING ERROR AND INSPECTION ERROR WERE CONSIDERED. ADDITIONAL EXPERIMENTAL WORK AND FURTHER SIMULATION STUDIES ARE RECOMMENDED. /FHWA/

  • Corporate Authors:

    Michigan Technological University, Houghton

    Houghton, MI  United States  49931

    Michigan Department of State Highways

    State Highways Building, PO Drawer K
    Lansing, MI  United States  48904

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Hockings, W A
    • PARK, B
    • Volin, M E
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00214515
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: R-133
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Aug 8 1971 12:00AM