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Title: Influence of voids on density measurements of granular materials using gamma radiation techniques
Authors: Tan, Siew-Ann 
Fwa, Tien-Fang 
Issue Date: Sep-1991
Source: Tan, Siew-Ann,Fwa, Tien-Fang (1991-09). Influence of voids on density measurements of granular materials using gamma radiation techniques. Geotechnical Testing Journal 14 (3) : 257-265. ScholarBank@NUS Repository.
Abstract: 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 ln (COUNT) versus DENSITY calibration line for solid materials was obtained. Next, aluminium cylindrical specimens with concentric holes of various diameters representing various porosities from 0 to 90% were tested. When compared to the solid material calibration line, it is clear that the bulk density calculated based on the gamma-ray path geometry gives the same calibration as the solid specimens. Subsequently, cylindrical specimens of dry sands and gravels were also made and tested.
Source Title: Geotechnical Testing Journal
ISSN: 01496115
Appears in Collections:Staff Publications

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