QUALITY ASSURANCE - A COOPERATIVE EFFORT FROM PRODUCER TO CONTRACTING AGENCY

A statistical quality control specification (details are provided in an attachment) is described which allows acceptance or rejection of material on the average of test results in lieu of accepting or rejecting on an individual basis. A randomized method is used to determine when and where to sample (the concept is described in an attachment). The details are given of key points in the specification. These include detail requirements of aggregate subbase and base materials (liquid limit and plasticity index); job mix formula; plant inspection acceptance; adjustment system; and the referee system (to allow for resampling and testing when there is doubt that the test results are valid). The review of pilot projects indicate that desired results were being achieved. To establish the bases for a quality assurance system in the aggregate industry, data is assembled from a given plant and fed into computers to establish production control records. If the records reach a given level of confidence, the plant is rated as a Level I Produce. A Level I Producer can ship aggregate on certification with only random spot checking by State Inspectors. All other producers will have their production controlled by the pre-sampling and pretesting method.

• Supplemental Notes:
  • Proceedings from a conference on Utilization of Graded Aggregate Base Materials in Flexible Pavements, March 25-26, 1974, Oak Brook Hyatt House, Oak Brook, Illinois.
• Corporate Authors:

  National Crushed Stone Association

  1415 Elliot Place, NW
  Washington, DC  United States  20007

  National Sand and Gravel Association

  900 Spring Street
  Silver Spring, MD  United States  20910

  National Slag Association

  300 South Washington Street
  Alexandria, VA  United States  22314
• Authors:
  • Fielding, R V
• Publication Date: 1974

Media Info

• Features: Tables;
• Pagination: p. XVI1-21
• Serial:
  • Publication of: National Crushed Stone Association
  • Publisher: National Crushed Stone Association

Subject/Index Terms

• TRT Terms: Base course (Pavements); Coarse aggregates; Computer memory; Fine aggregates; Flexible pavements; Inspection; Liquid limits; Pavement design; Quality control; Randomization; Specifications; Statistical analysis; Structural plates; Subbase materials
• Uncontrolled Terms: Base
• Old TRIS Terms: Graded coarse aggregate; Graded fine aggregate; Job mix formula; Plate vibrators; Test results
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00127538
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 7 1976 12:00AM