STRATISTICAL QUALITY CONTROL STUDY-BASE COURSE

THE PURPOSE OF THE STUDY WAS TO ESTABLISH A BASIS FOR SETTING FUTURE SPECIFICATION LIMITS FROM COLLECTION OF DATA FROM MATERIAL ANALYSIS, TO MAKE STATISTICAL ANALYSIS OF TYPICAL SOIL AGGREGATE BASE COURSE AND TO APPLY STATISTICALLY OBTAINED LIMITS ON A TENTATIVE BASIS IN COMPARISON WITH CURRENT SPECIFICATIONS. RANDOMIZED SAMPLES WERE TAKEN FROM THE BASE COURSES OF THREE WIDELY SEPARATED PROJECTS. DETERMINATIONS MADE FOR VALUES OF LIQUID LIMIT, PLASTICITY INDEX AND GRADATION ON REPLICATED SAMPLES. STATISTICAL EVALUATION WAS MADE FOR VARIANCE OF THE MATERIAL, SAMPLING AND TESTING. ACCEPTANCE LIMITS OF VARIATION IN THE STATED CHARACTERISTICS WERE TABULATED. NORMAL DISTRIBUTION CURVES WERE SHOWN FOR VARIOUS SIEVE SIZES AND MATERIALS. THE AUTHORS STATE THAT ADDITIONAL SAMPLING AND TESTING WILL BE NECESSARY TO ESTABLISH NEW ACCEPTANCE LIMITS AS THERE SEEMS TO BE CONSIDERABLE WEAKNESS BETWEEN THE STATISTICALLY OBTAINED ACCEPTANCE LIMITS AND THE EXISTING SPECIFICATION LIMITS. /BPR/

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Filing Info

  • Accession Number: 00214449
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Jul 5 1994 12:00AM