REPRODUCIBILITY IMPROVEMENT FOR SOIL AND AGGREGATE CONTROL TESTS

Laboratory test procedures and equipment were reviewed in an effort to identify discrepancies and improve the reproducibility of tests commonly used to evaluate soils and aggregates for construction in California. Twenty-three laboratories participated in this study by testing prepared test samples under the observation of the researchers. Human errors were found to be a primary factor contributing to poor test reproducibility. The most common human errors were in weighing and measuring quantities. Other sources of test variability were traced to differences in testing equipment, deficiencies in procedural definitions, and changes in test solutions. In response to the findings of this study, several modifications have been made to the California Test Methods. These same findings and revisions are applicable to corresponding AASHTO and ASTM procedures. (FHWA)

Media Info

  • Pagination: 106 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00345104
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/CA/TL-80/32 Final Rpt., 19301-633173
  • Contract Numbers: F77TL06
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jan 29 1982 12:00AM