Selected producers of crushed stone were surveyed on their attitudes toward setting up structured quality control systems that might largely replace much of the conventional testing of aggregates by state inspectors. Their responses are summarized. The overall response was clearly in favor of the concept. Most producers felt that such a system would eliminate many problems and pay off in terms of customer confidence. The essentials of workable, statistically valid specifications that would be appropriate to the producer control concept are outlined. Such specifications should define acceptable variations from approved target gradations for given end uses but should permit considerable latitude to the producer in establishing the target gradation. Good gradation control requires careful processing; the desired consistency is seldom if ever found in materials taken from natural deposits with little or no processing. The importance of close adherence to sound, standardized sampling techniques is emphasized. Both process control samples and samples monitored by state or other agencies should be taken from the "as-produced" material. Test portions for monitoring should be split from routine process control field samples to provide a valid statistical comparison of the producer's control program. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 4-7
  • Monograph Title: Process control in the construction industry
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00300405
  • Record Type: Publication
  • ISBN: 030902837X
  • Files: TRIS, TRB
  • Created Date: Sep 29 1979 12:00AM