ASTM D3665-07e1
(Practice)Standard Practice for Random Sampling of Construction Materials
Standard Practice for Random Sampling of Construction Materials
SIGNIFICANCE AND USE
This practice is useful for determining the location or time, or both, to take a sample in order to minimize any unintentional bias on the part of the person taking the sample.
Note 1—The effectiveness of this practice in achieving random samples is limited only by the conscientiousness of the user in following the stipulated procedures.
The selection procedures and examples in this standard provide a practical approach for ensuring that construction material samples are obtained in a random manner. Additional details concerning the number of sample increments, the number of samples, the quantities of material in each, and the procedures for extracting sample increments or samples from the construction lot or process are contained in Practices C172, C183, D75, D140, D979, D5361, and Test Method D345.
This standard contains examples citing road and paving materials. The concepts outlined therein are applicable to the random sampling of any construction material and can easily be adapted thereto.
Additional sampling guidance is provided in Practice E105 concerning probability sampling, Practice E122 concerning choosing sample sizes to estimate the average quality of a lot or process (see Note 2), and in Practice E141 for acceptance of evidence based on results of probability sampling.
Note 2—The guidance contained in Practice E122 is not available in other documents referenced in this section.
The best and most practical method for ensuring that samples of construction materials include the full range of a construction process is by incorporating a stratified-random sampling procedure into the sampling process. To implement a stratified-random sampling procedure, divide the lot to be sampled into the desired number of equal sublots and randomly sample each sublot in accordance with this standard.
Note 3—If the sublots are of unequal size, it will likely be necessary to weight the samples in order to maintain a fair and defensible sampling process.
SCOPE
1.1 This practice covers the determination of random locations (or timing) at which samples of construction materials can be taken. For the exact physical procedures for securing the sample, such as a description of the sampling tool, the number of increments needed for a sample, or the size of the sample, reference should be made to the appropriate standard method. The selection procedures in Section 6 utilize the table of four-digit numbers given in Table 1.
1.2 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.
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Designation:D3665–07
Standard Practice for
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Random Sampling of Construction Materials
This standard is issued under the fixed designation D3665; 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.
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´ NOTE—Footnote 1 and 3.1 were editorially corrected in December 2010.
1. Scope Results of Probability Sampling
1.1 This practice covers the determination of random loca-
3. Terminology
tions (or timing) at which samples of construction materials
3.1 Definitions of Terms Specific to This Standard:
canbetaken.Fortheexactphysicalproceduresforsecuringthe
3.1.1 representative sample, n—(1) a random sample; or (2)
sample, such as a description of the sampling tool, the number
an unbiased sample.
of increments needed for a sample, or the size of the sample,
3.1.1.1 random sample, n—a sample obtained from a lot of
reference should be made to the appropriate standard method.
material in such a manner that all parts of the lot have a known
The selection procedures in Section 6 utilize the table of
probability of being included in the sample.
four-digit numbers given in Table 1.
3.1.1.2 Discussion—An example of random sample is the
1.2 This standard does not purport to address all of the
casewherespecificationslimitroadwaysamplingtowithinone
safety concerns, if any, associated with its use. It is the
foot of the edge, therefore the probability of inclusion of
responsibility of the user of this standard to establish appro-
samples within one foot of the edge is zero.
priate safety and health practices and determine the applica-
3.1.1.3 unbiased sample, n—asampleobtainedfromalotof
bility of regulatory limitations prior to use.
material in such a manner that all parts of the lot have an equal
2. Referenced Documents probability of being included in the sample.
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2.1 ASTM Standards:
4. Significance and Use
C172 Practice for Sampling Freshly Mixed Concrete
4.1 This practice is useful for determining the location or
C183 Practice for Sampling and the Amount of Testing of
time, or both, to take a sample in order to minimize any
Hydraulic Cement
unintentional bias on the part of the person taking the sample.
D75 Practice for Sampling Aggregates
D140 Practice for Sampling Bituminous Materials
NOTE 1—The effectiveness of this practice in achieving random
D345 Test Method for Sampling and Testing Calcium samples is limited only by the conscientiousness of the user in following
the stipulated procedures.
Chloride for Roads and Structural Applications
D979 Practice for Sampling Bituminous Paving Mixtures
4.2 The selection procedures and examples in this standard
D5361 Practice for Sampling Compacted Bituminous Mix-
provide a practical approach for ensuring that construction
tures for Laboratory Testing
material samples are obtained in a random manner. Additional
E105 Practice for Probability Sampling of Materials
details concerning the number of sample increments, the
E122 Practice for Calculating Sample Size to Estimate,
number of samples, the quantities of material in each, and the
With Specified Precision, the Average for a Characteristic
procedures for extracting sample increments or samples from
of a Lot or Process
the construction lot or process are contained in Practices C172,
E141 Practice for Acceptance of Evidence Based on the
C183, D75, D140, D979, D5361, and Test Method D345.
4.3 This standard contains examples citing road and paving
materials. The concepts outlined therein are applicable to the
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This practice is under the jurisdiction of ASTM Committee D04 on Road and
random sampling of any construction material and can easily
Paving Materials and is the direct responsibility of Subcommittee D04.30 on
be adapted thereto.
Methods of Sampling.
4.4 Additional sampling guidance is provided in Practice
Current edition approved Aug. 1, 2007. Published August 2007. Originally
E105 concerning probability sampling, Practice E122 concern-
approved in 1978. Last previous edition approved in 2006 as D3665 – 06. DOI:
10.1520/D3665-07.
ing choosing sample sizes to estimate the average quality of a
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
lotorprocess(seeNote2),andinPracticeE141foracceptance
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
of evidence based on results of probability sampling.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D3665–07
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