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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Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.

This test method describes the procedures for measuring in-place density and moisture of soil and soil-aggregate by use of nuclear equipment. Most gauges display this value directly. 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. Soil testing Back to Sstm Print. For Individuals with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at 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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The quality of the result produced by this standard test method is aastm on the competence of the personnel performing d6983, and the suitability of the equipment and facilities used.

ASTM D6938 – 17a

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

The dry density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section Soil testing Field Services: Most gauges display this value directly. Link to Active This link will always route to the current Active version of the standard.

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

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.

It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. The density of the test sample in mass per unit d9638 is calculated by comparing the detected rate of gamma radiation with previously established calibration data.

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

ASTM D Standard

For more information, contact: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part s6938 the standard. Historical Version s – view previous versions of standard.

The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water.

Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. This places the gamma and neutron sources and the detectors in the same plane. 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.

The neutron source and the thermal neutron detector are both located at the surface of the material being tested.