Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

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标准简介

Designation: D6938-17 Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)11. Scope1.1 This test method describes the procedures for measuringin-pliace density and moisture of soil and soil-aggregate by useof nucear equipment (hereafter referred to asgauge""y.Thedensity of the material may be measured by directtransmission,backscatcr, or backscatterVair-gap ratio methods.Measurements for water (moisture) content arc iaken at thesurface in backscatter mode regardless of the mode being usedfor density.1.1.1 For limitations see Section 5 on Intcrferences.1.2 The total or wet density of soil and soill-aggregate ismcasured by the attenuation of gamma raliation where.indirect transmission, the source is placed at a known depth up to300 mm (12 in.) and the detector(s) remains on the surface( some gauges may reverse this orientation); or in backscatter orbackscatterVair-gap the source and deleclorisy both remain onthe surface.1.2.1The density of the test sample in mass per unit volumeis calculatedd by comparing the detected rate of gamma radia-tion with previously established calibration data.1.2.2The dry density of the

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