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A FIELD EVALUATION OF NUCLEAR GAUGE CALIBRATION METHODS PART 2: FIELD AND BLOCKS-FIELD CALIBRATIONS

A field evaluation was made of several methods of calibrating nuclear density/moisture gauges. Wet densities, moisture contents and dry densities of a layer of crushed rock pavement were determined by four gauges at 40 sites using the manufacturer's Blocks calibration. Subsequently the corresponding orthodox test values were measured by the Sand Replacement and IPCAD tests. In Part 2 of this two-part series, the Field method calibrations are calculated. The potential biases in slopes and intercepts of the Blocks, Field and Blocks-Field methods calibration lines are compared. The study data tend to suggest that the biases in the intercept of calibrations by the Blocks method exceed those that can occur in the Field method. The biases in the intercepts of calibrations by the Field and Blocks-Field method are similar, although those of the Blocks-Field method would in general be greater as data are usually taken at a lesser number of sites. The data were not sufficient to enable a comparison of the biases that can occur in the slopes of the calibration lines of the three methods. The IPCAD wet and dry densities were observed to be on average 2.2 percent above the values determined by the Sand Replacement test. The data suggest there is a genuine difference in the results of the two orthodox test methods. (Author/TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 83-89
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00452869
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jul 31 1988 12:00AM