ASTM D6938 PDF

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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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This places the gamma and neutron sources and the detectors in the same plane. Soil testing Field Services: For more information, contact: This test method describes the procedures for measuring in-place density and moisture of soil and soil-aggregate by use of nuclear equipment. When divided by the density atsm water and then multiplied bythe water mass per unit volume is equivalent to the volumetric water content.

Most gauges display this value directly. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard.

The water content most prevalent in wstm and construction activities is known as the gravimetric water content, w, and is the ratio of the mass d69388 the water in pore spaces to the total mass of solids, expressed as a percentage. 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.

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The values in inch-pound units ft — lb units are provided for information only. 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.

ASTM D6938

Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. The nondestructive nature allows repetitive measurements at a single r6938 location and statistical analysis of the results.

The dry density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section The total or wet density of soil and soil-aggregate is measured by d69938 attenuation aatm gamma radiation where, in direct transmission, the source is placed at a known depth up to mm 12 in. 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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Request Quote Client Login. 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. The neutron source and the thermal neutron detector are both located at the surface of the material being tested.

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Link to Active This link will ashm route to the current Active version of the standard.

ASTM D Standard

Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.

For D69388 with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at Most gauges display this value directly. Soil testing Back to Results Print.

The direct transmission is the preferred method. In addition, they are representative of the significant digits that should generally be retained.

It is beyond asstm scope of this standard to consider significant digits used in analysis methods for engineering design. Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results.