ASTM D6938 PDF

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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Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density.

Soil testing Back to Results Print. The values in inch-pound units ft — lb units are provided for information only. Historical Version s – view previous versions of standard.

The neutron source and the thermal neutron detector are both located at the surface of the material being tested. 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. Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. In addition, they are representative of the significant digits that should generally be retained.

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For more information, contact: Most gauges display this value directly. The nondestructive nature allows repetitive measurements at a single test location and statistical analysis of the results.

For Individuals with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at Most gauges display this value directly. The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by aztm, a component of water. The astn density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM D6938

Users of this standard are cautioned that compliance with Practice D does not xstm itself ensure reliable results. 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 pore spaces to the total mass of solids, expressed as a percentage. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. The total or wet density of soil and soil-aggregate is measured by the attenuation of gamma radiation where, in direct transmission, the source is placed at a known depth up to mm 12 in.

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ASTM D Standard

The direct transmission is the preferred method. Link to Active This link will always route to the current Active version of the standard. 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.

Soil testing Field Services: When divided by the density of water and then multiplied bythe water mass per unit volume is equivalent to the volumetric water content.

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. This test method describes the procedures for measuring in-place density and moisture of soil and soil-aggregate by use of nuclear equipment.

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It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. This places the gamma and neutron sources and the detectors in the same plane.

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