ASTM D Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth). depth, etc.) Verify proper rebar sizes and placements. Verify proper reinforcing overlaps. Verify proper clearance and that chairs are. ASTM D Uploaded by Xavior. Standard Test Method for In-Place Density and Water Content of Soil and Soil- Aggregate by Nuclear Methods (Shallow.

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The water content most prevalent in engineering and construction activities is known as the gravimetric water content, w, and is the ratio of the mass of the water in d6983 spaces to the total mass of solids, expressed as a percentage.

Historical Version s – view previous versions of standard.

Request Quote Client Login. Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. This places the gamma and adtm sources and the detectors in the same plane. The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water.

ASTM D6938 – 17a

Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. Most gauges display this value directly.


Most gauges display this value directly.

The direct transmission is the preferred method. The neutron source and the thermal neutron detector are both located at the surface of the material being tested.

It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. The values in inch-pound units d69938 — lb units are provided for information only. Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. For Individuals with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at The nondestructive nature allows repetitive measurements at a single test location and statistical analysis of the results.

When divided by the density of water and then multiplied bythe water mass per unit volume is equivalent to the volumetric water content. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

The dry density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section This test method describes the procedures for measuring in-place density and moisture of soil and soil-aggregate by use of nuclear equipment.


Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM D Standard

Soil testing Back to Results Print. Link to Active This link will always route to the current Active version of the standard. The density of the test sample in mass per unit volume is calculated by comparing the detected rate of gamma radiation with previously established calibration data.

Soil c6938 Field Services: For more information, contact: The total or wet density of soil and soil-aggregate is measured by the attenuation adtm gamma radiation where, in direct transmission, the source is placed at a known depth up to mm 12 in. The quality of the result produced by this standard test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used.

In addition, they are representative of the significant digits that should generally be retained.