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Alternative Title:Evaluation of a nuclear method for determining soil moisture and density.
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Abstract:This report constitutes the results of a series of calibration curves prepared by comparing the Troxler Nuclear Density - Moisture Gauge count ratios with conventional densities as obtained by the Soiltest Volumeter and the sand displacement methods.
The disadvantages of the present conventional methods of obtaining in-place densities are well recognized with the time consuming element being among the more prominent of these disadvantages. In addition, the fact that conventional methods leave a great deal to be desired, as far as "accuracy" is concerned, is something which the engineer is more or less forced to accept.
Recent developments in the use of radioisotope techniques for the measurement of moisture and density offer a rapid method for obtaining in situ determinations of these particular engineering properties.
The measurement of density by radioisotope technique is based on the ability of gamma photos to be scattered or absorbed in approximate proportion to the density of the material through which they are passed.
The measurement of moisture is based on the principle of thermalizaiton (slow down of fast neutrons) by the hydrogen contained within a given soil mass.
All of the calibration curves contained in this report are the direct result of field comparisons of the Troxler Gauge with conventional methods. These curves were derived by the Polynomial Curve Fitting method utilizing the theory of least squares as processed by the Louisiana Department of Highways 1620, IBM Data Processing System.
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