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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For Individuals with needing special assistance for disabilities or limited English proficiency Please xstm our Title VI specialist at The neutron source and the thermal neutron detector are both located at the surface of the material being tested.

For more information, contact: The direct transmission is the preferred method. 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.

ASTM D Standard

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Soil testing Back to Results Print. The nondestructive nature allows repetitive measurements at a single test location and statistical analysis of the 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.

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When divided by the density of water and then multiplied bythe water mass per unit volume is equivalent to the volumetric d693 content. Request Quote Client Login.

ASTM D6938

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. The dry density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density.

Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water.

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

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This places the gamma and neutron sources and the detectors in the same plane. 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.

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 ft — lb units are provided for information only. It is the responsibility of the user of this e6938 to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Historical Version s – view previous versions of standard. Most gauges display this value directly. Most gauges display this value directly. Link to Active This link will always route to the current Active version of the standard. Soil testing Field Services: In addition, they are representative of the significant digits that should generally be retained.