Radiometric Determination of the Density of Fresh Shielding Concrete In Situ

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Title: Radiometric Determination of the Density of Fresh Shielding Concrete In Situ

Author(s): A. Honig

Publication: Special Publication

Volume: 82

Issue:

Appears on pages(s): 603-618

Keywords: density (mass)/volume); fresh concretes; non-1 destructive tests; radiation shielding; radiometry.

Date: 9/1/1984

Abstract:
Radiometric determination of density and moisture of soils and building materials has been carrie jout successfully. Many types of instruments are available. However, instruments are not available for measurement on fresh concrete so that it is not possible to repair inhomogeneities, if any even before hardening. The paper describes an analog and a digital radiation density meter and their application in the inspection of concrete walls against radiation. By repairing defective concrete in the course of concrete placement it is possible to attain a laboratory quality of concrete placed on site. Long-term and temperature stability, the measuring procedure, calibration of the instruments, biological shielding tests and the evaluation of the results are described.