CALIBRATION STANDARDS FOR NUCLEAR GAGES - DENSITY AND MOISTURE STANDARDS

A search for suitable materials to serve as calibration standards for nuclear moisture-density gages was undertaken. A series of six blocks were fabricated for these standards. Each standard consisted of stone from a separate source. Three were quarried and cut to suitable size from stone and three were cast of portland cement and selected natural aggregate from separate sources. These were chosen as the calibration standards for all nuclear density gages used by the California Department of Transportation. Questionnaire replies from District Materials Engineers indicated that the use of standardized blocks improved accuracy, uniformity, and flexibility. Also, monetary savings are attributed to this procedure. The research involved the selection of suitable nuclear moisture gage calibration standards which resulted in a recommendation to adopt a series of silica sand water mixtures as the moisture gage calibration standards. The investigation of several soils and materials revealed a greater understanding of moisture gage response to various soil minerals. The results of these laboratory tests indicated the magnitude of gage measurement errors that could occur during moisture determinations.

• Supplemental Notes:
  • See also report dated Nov 69, PB-189 354.
• Corporate Authors:

  California Department of Transportation

  Transportation Laboratory
  5900 Folsom Boulevard
  Sacramento, CA  United States  95819

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Castanon, D R
  • Chan, E
  • Chang, J C
  • HANNON, J B
  • Forsyth, R A
• Publication Date: 1975-12

Media Info

• Pagination: 64 p.

Subject/Index Terms

• TRT Terms: Calibration; Densitometers; Field tests; Measuring instruments; Moisture meters; Natural aggregates; Nuclear tests; Portland cement; Silica sands; Standards; Stone
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00136977
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 632908 Final Rpt., CA-DOT-TL-2908-3-75-30
• Files: NTIS, TRIS, USDOT, STATEDOT
• Created Date: Aug 11 1976 12:00AM