INFLUENCE OF VOIDS ON DENSITY MEASUREMENTS OF GRANULAR MATERIALS USING GAMMA RADIATION TECHNIQUES

This paper presents the results of laboratory gamma-ray density measurements on 100-mm-diameter specimens with an adapted twin-probe transmission-type density gage originally developed for field use. Primary factors affecting density calibration for soils include soil composition and soil porosity. To appreciate the soil composition factor, 100-mm-diameter specimens of solid materials similar to the soil minerals were tested, and from the data a linear 1n (COUNT) versus DENSITY calibration line for solid materials was obtained. Next, aluminum cylindrical specimens with concentric holes of various diameters representing various porosities from 0 to 90 percent were tested. Results indicate that specimens of uniform densities and uniform void distributions must be used for calibration. Subsequently, using the calibration line obtained for solid homogeneous specimens, densities of porous soils measured by the gamma-ray device would be the bulk density of the materials confined in the path geometry of the gamma rays. Thus the gamma-ray apparatus can be a very useful tool for identifying nonuniformities due to void variation within the same specimen.

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  • Corporate Authors:

    American Society for Testing and Materials (ASTM)

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • Tan, S-A
    • Fwa, T F
  • Publication Date: 1991-9

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  • Accession Number: 00618556
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1992 12:00AM