ASTM D6938 PDF

Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. When divided by the density of water and then multiplied by , the water mass per unit volume is equivalent to the volumetric water content. The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water. The neutron source and the thermal neutron detector are both located at the surface of the material being tested. 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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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. When divided by the density of water and then multiplied by , the water mass per unit volume is equivalent to the volumetric water content.

The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water. The neutron source and the thermal neutron detector are both located at the surface of the material being tested.

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 direct transmission is the preferred method. This places the gamma and neutron sources and the detectors in the same plane. The values in inch-pound units ft - lb units are provided for information only. In addition, they are representative of the significant digits that should generally be retained.

The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. 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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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. When divided by the density of water and then multiplied by , the water mass per unit volume is equivalent to the volumetric water content. 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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ASTM D6938

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. When divided by the density of water and then multiplied by , the water mass per unit volume is equivalent to the volumetric water content. The water mass per unit volume is determined by the thermalizing or slowing of fast neutrons by hydrogen, a component of water. The neutron source and the thermal neutron detector are both located at the surface of the material being tested.

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Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. It is the intent of this subcommittee that this standard replace D and D Most gauges display this value directly.

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This test method describes the procedures for measuring in-place density and moisture of soil and soil-aggregate by use of nuclear equipment. Measurements for water moisture content are taken at the surface in backscatter mode regardless of the mode being used for density. 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. 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 dry density of the test sample is obtained by subtracting the water mass per unit volume from the test sample wet density Section

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