ASTM D6607-00(2015)

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Designation: D6607 − 00 (Reapproved 2009) D6607 − 00 (Reapproved 2015)
Standard Practice for
Inclusion of Precision Statement Variation in Specification
Limits
This standard is issued under the fixed designation D6607; 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
1.1 This practice covers a method of determining rational specification limits by inclusion of the precision of the test method
used in the specification.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard 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 standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C802 Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction
Materials
D2172 Test Methods for Quantitative Extraction of Bitumen From Bituminous Paving Mixtures
D2726 Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Bituminous Mixtures
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
2.2 Federal Highway Administration Report:
FHWA Report HI-93–047 Materials Control and Acceptance—Quality Assurance, Federal Highway Administration, May 1993
3. Terminology
3.1 For definitions of terms used in this practice, consult Practice E177.
4. Significance and Use
4.1 Each test method has a limited precision. Even if a test is performed as carefully and as correctly as possible on a material
which is as homogeneous as can be obtained, the test will still vary from one to another. A widely used measure of the variation
of the test results from a test method is the standard deviation (σ). In an ASTM standard test, the standard deviation of the test
method can be found in the Precision and Bias statement for the test. The “Blue Book,” Form and Style for ASTM Standards,
requires that all test methods include Precision and Bias statements. Practice C670 and Practice C802 provide guidance for
determination of these values.
4.2 If the precision of a test method is low and the precision of the test has not been properly considered in a material
specification, a uniform material with the right quality may still be rejected most of the time because of the wide variation of the
test results. In order to have rational specification limits, the precision of the test used should be properly included in a
specification.
4.3 This practice provides a guideline for proper inclusion of precision of the test method in a rational specification.
This guidepractice is under the jurisdiction of Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.94 on Statistical
Procedures and Evaluation of Data.
Current edition approved Dec. 1, 2009Jan. 1, 2015. Published January 2010February 2015. Originally approved in 2000. Last previous edition approved in 20052009 as
D6607 – 00 (2005).(2009). DOI: 10.1520/D6607-00R09. 10.1520/D6607-00R15.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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D6607 − 00 (2015)
5. Procedure
5.1 Determine the effective standard deviation (σ ) of the test results due to the combined effects of materials variation and test
X
variation using Eq 1:
2 2
σ 5 ~σ 1σ ! (1)
X M T
where:
σ = standard deviation of test property due to material variation (see Note 1), and
M
σ = standard deviation of test property due to test method (see Note 2).
T
NOTE 1—σ is the expected standard deviation of the material property when the material is produced in a properly controlled process. A standard
M
deviation which is representative of the acceptable variation of the material can be used. It can be calculated from the data obtained from properly
produced materials.
NOTE 2—σ is the standard deviation as given in the precision statement for the test method used to measure the test property.
T
5.2 Determine the standard deviation of the mean of the test results σ¯ using Eq 2:
~ !
¯
σ 5 σ /=n (2)
3 3
where:
n = number of tests performed.
5.3 For a two-ended specification (with both a minimum and maximum limits), the specification limits for the average test value
from n test x¯ should be the following:
~ !
¯
μ 2 Z σ¯ #3
...