When making decisions about accepting or rejecting materials on the basis of testing, a knowledge of the precision of the test is essential for proper judgement. The precision of the aggregate tests used by MTC is not known. Before the implementation of this interlaboratory testing program, MTC did not have the tools with which to study the precision of its aggregate tests in a systematic and statistically valid manner. As part of the Head Office mandate for monitoring the performance of Regional laboratories, a statistical basis for interlaboratory testing was designed. Computer programs for calculating estimates of precision were written. A pilot interlaboratory testing study was conducted to study the precision of the tests as they are performed at MTC. Tests of poor precision were recognized. The data shows where study should be directed to improve the precision of MTC aggregate tests. The preliminary estimates of precision developed in this study will help MTC to make more intelligent decisions about aggregate suitability. This will ultimately result in a reduced cost for construction aggregates. The statistical design and the computer programs can be used by other Head Office Units and the Regional laboratories in the monitoring that they are required to do. A number of detailed recommendations have been made about specific tests. These will result in a reduced cost of testing or improvement in precision or accuracy. We recommend that this interlaboratory testing program be continued on a routine basis. An annual report should be written and distributed to the participating laboratories and other interested bodies. (Author)

  • Corporate Authors:

    Ontario Ministry of Transportation & Communic, Can

    1201 Wilson Avenue
    Downsview, Ontario M3M 1J8,   Canada 
  • Authors:
    • Rogers, C A
    • Manchester, L
  • Publication Date: 1979-5

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 101 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00335501
  • Record Type: Publication
  • Report/Paper Numbers: Rpt. EM-30
  • Files: TRIS
  • Created Date: Sep 16 1981 12:00AM