ASTM C702/C702M-11
(Practice)Standard Practice for Reducing Samples of Aggregate to Testing Size
Standard Practice for Reducing Samples of Aggregate to Testing Size
SIGNIFICANCE AND USE
Specifications for aggregates require sampling portions of the material for testing. Other factors being equal, larger samples will tend to be more representative of the total supply. This practice provides procedures for reducing the large sample obtained in the field or produced in the laboratory to a convenient size for conducting a number of tests to describe the material and measure its quality in a manner that the smaller test sample portion is most likely to be a representation of the larger sample, and thus of the total supply. Failure to carefully follow the procedures in this practice could result in providing a nonrepresentative sample to be used in subsequent testing. The individual test methods provide for minimum amount of material to be tested.
Under certain circumstances, reduction in size of the large sample prior to testing is not recommended. Substantial differences between the selected test samples sometimes cannot be avoided, as for example, in the case of an aggregate having relatively few large size particles in the sample. The laws of chance dictate that these few particles may be unequally distributed among the reduced size test samples. Similarly, if the test sample is being examined for certain contaminants occurring as a few discrete fragments in only small percentages, caution should be used in interpreting results from the reduced size test sample. Chance inclusion or exclusion of only one or two particles in the selected test sample may importantly influence interpretation of the characteristics of the original sample. In these cases, the entire original sample should be tested.
SCOPE
1.1 This practice covers three methods for the reduction of large samples of aggregate to the appropriate size for testing employing techniques that are intended to minimize variations in measured characteristics between the test samples so selected and the large sample.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
Note 1—Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size.
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.
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Designation: C702/C702M − 11 American Association State
Highway and Transportation
Officials Standard: T 248
Standard Practice for
1
Reducing Samples of Aggregate to Testing Size
This standard is issued under the fixed designation C702/C702M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3. Terminology
3.1 Definitions—The terms used in this practice are defined
1.1 This practice covers three methods for the reduction of
in Terminology C125.
large samples of aggregate to the appropriate size for testing
employing techniques that are intended to minimize variations
4. Significance and Use
in measured characteristics between the test samples so se-
lected and the large sample. 4.1 Specifications for aggregates require sampling portions
of the material for testing. Other factors being equal, larger
1.2 The values stated in either SI units or inch-pound units
samples will tend to be more representative of the total supply.
are to be regarded separately as standard. The values stated in
This practice provides procedures for reducing the large
each system may not be exact equivalents; therefore, each
sample obtained in the field or produced in the laboratory to a
system shall be used independently of the other. Combining
convenientsizeforconductinganumberofteststodescribethe
values from the two systems may result in non-conformance
material and measure its quality in a manner that the smaller
with the standard.
test sample portion is most likely to be a representation of the
NOTE 1—Sieve size is identified by its standard designation in Speci-
larger sample, and thus of the total supply. Failure to carefully
fication E11. The alternative designation given in parentheses is for
follow the procedures in this practice could result in providing
information only and does not represent a different standard sieve size.
a nonrepresentative sample to be used in subsequent testing.
1.3 This standard does not purport to address all of the
The individual test methods provide for minimum amount of
safety concerns, if any, associated with its use. It is the
material to be tested.
responsibility of the user of this standard to establish appro-
4.2 Under certain circumstances, reduction in size of the
priate safety and health practices and determine the applica-
large sample prior to testing is not recommended. Substantial
bility of regulatory limitations prior to use.
differences between the selected test samples sometimes can-
not be avoided, as for example, in the case of an aggregate
2. Referenced Documents
having relatively few large size particles in the sample. The
2
2.1 ASTM Standards:
laws of chance dictate that these few particles may be
C125 Terminology Relating to Concrete and Concrete Ag-
unequally distributed among the reduced size test samples.
gregates
Similarly, if the test sample is being examined for certain
C128 Test Method for Relative Density (Specific Gravity)
contaminants occurring as a few discrete fragments in only
and Absorption of Fine Aggregate
small percentages, caution should be used in interpreting
D75 Practice for Sampling Aggregates
results from the reduced size test sample. Chance inclusion or
E11 Specification for Woven Wire Test Sieve Cloth and Test
exclusion of only one or two particles in the selected test
Sieves
sample may importantly influence interpretation of the charac-
teristics of the original sample. In these cases, the entire
original sample should be tested.
1
This practice is under the jurisdiction of ASTM Committee C09 on Concrete
5. Selection of Method
and ConcreteAggregatesand is the direct responsibility of Subcommittee C09.20 on
Normal Weight Aggregates.
5.1 Fine Aggregate—Reduce the size of samples of fine
Current edition approved Aug. 1, 2011. Published September 2011. Originally
aggregate that are drier than the saturated-surface-dry condi-
approved in 1971. Last previous edition approved in 2003 as C702–98(2003). DOI:
10.1520/C0702_C0702M-11.
tion (Note 2) using a mechanical splitter according to Method
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
A. Reduce the size of samples having free moisture on the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
particle surfaces by quartering according to Method B, or by
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. treating as a miniature stockpile as described in Method C.
Copyright © ASTM International, 100 Barr Harbor Drive, PO
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
American Association State
Designation:C702–98 (Reapproved 2003) Designation: C702/C702M – 11 Highway and Transportation
Officials Standard: T 248
Standard Practice for
1
Reducing Samples of Aggregate to Testing Size
This standard is issued under the fixed designation C702/C702M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This practice covers three methods for the reduction of large samples of aggregate to the appropriate size for testing
employingtechniquesthatareintendedtominimizevariationsinmeasuredcharacteristicsbetweenthetestsamplesso selected and
the large sample.
1.2The values stated in SI units are to be regarded as the standard.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
NOTE 1—Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information
only and does not represent a different standard sieve size.
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
2.1 ASTM Standards:
C125 Terminology Relating to Concrete and Concrete Aggregates
C128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate
D75 Practice for Sampling Aggregates Practice for Sampling Aggregates
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Terminology
3.1 Definitions—The terms used in this practice are defined in Terminology C125.
4. Significance and Use
4.1 Specifications for aggregates require sampling portions of the material for testing. Other factors being equal, larger samples
will tend to be more representative of the total supply. This practice provides procedures for reducing the large sample obtained
in the field or produced in the laboratory to a convenient size for conducting a number of tests to describe the material and measure
its quality in a manner that the smaller test sample portion is most likely to be a representation of the larger sample, and thus of
the total supply. Failure to carefully follow the procedures in this practice could result in providing a nonrepresentative sample to
be used in subsequent testing. The individual test methods provide for minimum amount of material to be tested.
4.2 Under certain circumstances, reduction in size of the large sample prior to testing is not recommended. Substantial
differences between the selected test samples sometimes cannot be avoided, as for example, in the case of an aggregate having
relatively few large size particles in the sample. The laws of chance dictate that these few particles may be unequally distributed
among the reduced size test samples. Similarly, if the test sample is being examined for certain contaminants occurring as a few
discrete fragments in only small percentages, caution should be used in interpreting results from the reduced size test sample.
1
This practice is under the jurisdiction ofASTM Committee C09 on Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee C09.20 on Normal
Weight Aggregates.
Current edition approved June 10, 2003. Published July 2003. Originally approved in 1971. Last previous edition approved in 1998 as C702–98. DOI:
10.1520/C0702-98R03.
Current edition approved Aug. 1, 2011. Published September 2011. Originally approved in 1971. Last previous edition approved in 2003 as C702–98(2003). DOI:
10.1520/C0702_C0702M-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Un
...
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