VARIABILITY IN ASPHALT PAVING MATERIALS

SELECTION OF STATISTICAL PROCEDURES WHICH WOULD FIT PRESENT PRACTICES AND SPECIFICATIONS WERE MADE TO BE APPLIED TO INDIVIDUAL CONSTRUCTION PROJECT TEST DATA. AN ELECTRONIC DATA PROCESSING ROUTINE WAS ESTABLISHED TO SUMMARIZE INFORMATION FROM INDIVIDUAL CONSTRUCTION PROJECTS AND TO CALCULATE THE MEAN AND STANDARD DEVIATION OF THE METHODS AND TEST RESULTS. THE STATISTICAL PROCEDURES SELECTED ARE A MATCHING SET OF VARIABLES SAMPLING PLANS BASED ON KNOWN STANDARD DEVIATION, UNKNOWN STANDARD DEVIATION AND AVERAGE RANGE WHICH ALL GUARANTEE ESSENTIALLY THE SAME PROTECTION. THE DATA PROCESSING PROGRAM WAS DESIGNED TO CALCULATE THE NUMBER OF SAMPLES, MEAN VALUE, STANDARD DEVIATION, COEFFICIENT OF VARIATION, AND QUALITY INDEX FOR EACH SERIES OF TEST RESULTS ON EACH PROJECT. ALSO PROVIDED WAS AN ADDITIONAL SORT OF THE ABOVE DATA FOR EACH INDIVIDUAL TYPE OF TEST WITH RESPECT TO TYPE OF ASPHALTIC MIX. AN AUXILIARY PROGRAM WAS DESIGNED TO CALCULATE STATE-WIDE POOLED STANDARD DEVIATIONS FOR EACH OF THESE LISTINGS TO REPRESENT STATE- WIDE PRODUCTION. A STATISTICAL ANALYSIS IS PRESENTED OF DATA FROM BASIC CONSTRUCTION WITH TWO TYPES OF HOT-MIXED ASPHALTIC MATERIALS. IT IS CONCLUDED THAT PROCEDURES DEVELOPED IN THIS PROGRAM PROVIDE A PRACTICAL WAY TO HANDLE VARIATIONS IN CONSTRUCTION TEST VALUES FROM NORMAL SPECIFICATION LIMITS.

  • Supplemental Notes:
    • Special RepT, 25 PP, 11 TAB, 7 REF, 5 APP
  • Corporate Authors:

    Iowa State Highway Commission

    800 Lincoln Way
    Ames, IA  USA  50010
  • Authors:
    • Deyoung, C E
  • Publication Date: 1968-2

Subject/Index Terms

Filing Info

  • Accession Number: 00214813
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: May 24 1994 12:00AM