AGGREGATE GRADIATION QUALITY CONTROL

The techniques of multivariate statistical analysis are used to study the segregation pattern of a stockpile, which leads to the design of a stratified random sampling method for stockpiled aggregate. This method is compared statistically with the current method in estimating aggregate composition for the final selection of stockpile sampling methods. Based on the suggested method, we designed several potential variables plans for stockpile aggregate inspection. The effect of handling and compaction on aggregate composition was investigated and models for estimating the degradation rate of each aggregate size due to handling and compaction from that before compaction or stockpile aggregate are presented. Several plans of acceptance sampling by attributes' to control the fraction of failing spots at the job site are recommended for in-place inspection. To find out whether aggregate inspection at the stockpile, or at the job-site before or after compaction, is the most beneficial, factors to be considered for choosing the inspection sites between stockpile and job-site are discussed. Because the current gradation test is time consuming, a more efficient test method is proposed. Samples are collected and tested by the current and proposed methods in a statistical experiment. The data are then analyzed by mans of multivariate statistical analysis to see whether the two methods give comparable resutls. An estimation procedure for converting the test results of the proposed test to those obtainable with the current test is also proposed. The estimation precision of the estimation procedure is statistically evaluated.

  • Supplemental Notes:
    • Conducted in cooperation with DOT, Federal Highway Administration.
  • Corporate Authors:

    Michigan Department of State Highways & Transport

    State Highways Building, P.O. Drawer K
    Lansing, MI  USA  48904
  • Authors:
    • Kuo, W H
  • Publication Date: 1976-11

Media Info

  • Pagination: 170 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158150
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-MI-RD-76 Final Rpt.
  • Contract Numbers: HP&R
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Sep 28 1977 12:00AM