INVESTIGATION OF SAMPLING PROCEDURE OF PAVING GRADE ASPHALTS

THE OBJECT OF THE INVESTIGATION DESCRIBED IN THIS REPORT WAS TO DETERMINE STATISTICALLY THE RELIABILITY OF FIELD SAMPLING PROCEDURES OF PAVING GRADE ASPHALTS. THIS STUDY WAS OF THE AUDIT TYPE IN THAT THE STATES PLANT INSPECTOR DID NOT KNOW WHEN OR HOW OFTEN THE SPECIAL LABORATORY SAMPLER WOULD APPEAR. THE REPORT PRESENTS ASSOCIATED PENETRATION TEST RESULTS OF 119 FIELD AND 121 SPECIAL SAMPLES TAKEN IN 1963 AND 1965. A 6% PROBABILITY OF OBTAINING AN OFF-GRADE PENETRATION, BASED ON 16,000 SAMPLES, IS GIVEN AS INFORMATION IN THE REPORT. THE AUTHORS LIST FACTORS CONTRIBUTING TO OBTAINING NON-REPRESENTATIVE SAMPLES FROM A SAMPLING SPIGOT AND SAFETY PRECAUTIONS THAT SHOULD BE CONSIDERED IN SPIGOT. THE CONCLUSION REACHED BY THE INVESTIGATORS IS THAT IMPROPER SAMPLING BY THE STATES FIELD REPRESENTATIVE WAS NOT THE CAUSE OF FAILURE OF ASPHALT SHIPMENTS TO COMPLY WITH PENETRATION TEST REQUIREMENTS. /BPR/

  • Supplemental Notes:
    • Hpr-1/2/ - FY-65, HPR, STATE NO F-7-81
  • Corporate Authors:

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914
  • Authors:
    • Zube, E
    • Skog, J
    • Kemp, G
  • Publication Date: 1966-3-16

Subject/Index Terms

Filing Info

  • Accession Number: 00214436
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Aug 1 1994 12:00AM