ASTM D7759-12
(Guide)Standard Guide for Nuclear Surface Moisture and Density Gauge Calibration
Standard Guide for Nuclear Surface Moisture and Density Gauge Calibration
SIGNIFICANCE AND USE
Gauge calibration is performed for the following purposes:
To formulate a mathematical equation, or density calibration equation, that relates the gauge density system response (the “density count”) to the soil-equivalent density of the standard on which this response is elicited.
To formulate a mathematical equation, or water content calibration equation, that relates the gauge water content system response (the “water content count”) to the water mass per unit volume value of the standard on which this response is elicited.
To ensure that the gauge has an in-place water mass per unit volume gauge precision level that is consistent with typical gauge response.
Gauge verification is performed for the following purposes:
To indicate to the party or agency performing the verification when the mathematical relationship between the in-place density reading indicated by the gauge and the corresponding gauge density test count needs to be adjusted so that the gauge calibration meets the required level of measurement uncertainty.
To indicate to the party or agency performing the verification when the mathematical relationship between the water mass per unit volume indicated by the gauge and the corresponding gauge water content test count needs to be adjusted so that the gauge calibration meets the required level of measurement uncertainty.
Gauge verification and calibration require specialized training and equipment. Gauge calibration and verification should only be conducted by those trained in the proper operation of the gauge, the calibration or verification standards, and any tables, charts, graphs, or computer programs required for the proper execution of these operations.
SCOPE
1.1 This guide describes the process and objective of calibrating the density system of a nuclear surface moisture and density gauge, or formulating the mathematical relationship between the density system response (the “density count”) of a nuclear surface moisture and density gauge and the corresponding density value of the density standard upon which the density system response was observed.
1.2 This guide describes the process and objective of calibrating the water content system of a nuclear surface moisture and density gauge, or formulating the mathematical relationship between the water content system response (the “water content count”) of a nuclear surface moisture and density gauge and the corresponding water mass per unit volume value of the water content standard upon which the water content system response was observed.
1.3 This guide describes the process and objective of verifying the density system of a nuclear surface moisture and density gauge.
1.4 This guide describes the process and objective of verifying the water content system of a nuclear surface moisture and density gauge.
1.5 This guide describes two mathematical processes by which the gauge measurement precision may be computed or measured.
1.6 This guide offers guidance for developing and reporting estimates of uncertainties in measurements made with gauges that have undergone calibration or verification.
1.7 All observed and calculated values shall confirm to the guide for significant digits and rounding established in Practice D6026.
1.8 This guide does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this guide to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.9 This guide offers an organized collection of information or a series of options and does not recommend specific course of action. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which ...
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Designation: D7759 − 12
StandardGuide for
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Nuclear Surface Moisture and Density Gauge Calibration
This standard is issued under the fixed designation D7759; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.9 This guide offers an organized collection of information
or a series of options and does not recommend specific course
1.1 This guide describes the process and objective of
of action. This document cannot replace education or experi-
calibratingthedensitysystemofanuclearsurfacemoistureand
ence and should be used in conjunction with professional
density gauge, or formulating the mathematical relationship
judgment. Not all aspects of this guide may be applicable in all
between the density system response (the “density count”) of a
circumstances. This ASTM standard is not intended to repre-
nuclear surface moisture and density gauge and the corre-
sent or replace the standard of care by which the adequacy of
sponding density value of the density standard upon which the
a given professional service must be judged, nor should this
density system response was observed.
document be applied without consideration of a project’s many
1.2 This guide describes the process and objective of
unique aspects. The word “Standard” in the title of this
calibrating the water content system of a nuclear surface
document means only that the document has been approved
moisture and density gauge, or formulating the mathematical
through the ASTM consensus process.
relationship between the water content system response (the
“water content count”) of a nuclear surface moisture and
2. Referenced Documents
density gauge and the corresponding water mass per unit
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2.1 ASTM Standards:
volume value of the water content standard upon which the
D653 Terminology Relating to Soil, Rock, and Contained
water content system response was observed.
Fluids
1.3 This guide describes the process and objective of
D2216 Test Methods for Laboratory Determination of Water
verifying the density system of a nuclear surface moisture and
(Moisture) Content of Soil and Rock by Mass
density gauge.
D6026 Practice for Using Significant Digits in Geotechnical
Data
1.4 This guide describes the process and objective of
D6938 Test Method for In-Place Density and Water Content
verifying the water content system of a nuclear surface
of Soil and Soil-Aggregate by Nuclear Methods (Shallow
moisture and density gauge.
Depth)
1.5 This guide describes two mathematical processes by
D7013 Guide for Nuclear Surface Moisture and Density
which the gauge measurement precision may be computed or
Gauge Calibration Facility Setup
measured.
3. Terminology
1.6 This guide offers guidance for developing and reporting
estimates of uncertainties in measurements made with gauges
3.1 Definitions—See Terminology D653 for general defini-
that have undergone calibration or verification.
tions.
1.7 All observed and calculated values shall confirm to the
3.2 Definitions of Terms Specific to This Standard:
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guide for significant digits and rounding established in Practice
3.2.1 coverage factor , n—a number larger than one by
D6026.
which a combined standard measurement uncertainty is mul-
tiplied to obtain an expanded measurement uncertainty.
1.8 This guide does not purport to address all of the safety
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concerns, if any, associated with its use. It is the responsibility
3.2.2 definitional uncertainty , n—the component of mea-
of the user of this guide to establish appropriate safety and
surement uncertainty resulting from the finite amount of detail
health practices and determine the applicability of regulatory
limitations prior to use.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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This practice is under the jurisdiction of ASTM Committee D18 on Soil and Standards volume information, refer to the standard’s Document Summary page on
Rock and is the direct responsibility of Subcommittee D18.08 on Special and the ASTM website.
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Construction Control Tests. JCGM 200:2008: International Vocabulary of Metrology—Basic and General
Current edition approved Feb. 1, 2012. Published March 2012. DOI: 10.1520/ Concepts and Associated Terms (VIM). 2008: Joint Document Committee for
D7759-12. Guides in Metrology.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7759 − 12
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inthedefinitionofthemeasurand.The“measurand”inthecase 3.2.17 Type B Uncertainty Evaluation , n—evalu
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