ASTM C702/C702M-18
(Practice)Standard Practice for Reducing Samples of Aggregate to Testing Size
Standard Practice for Reducing Samples of Aggregate to Testing Size
SIGNIFICANCE AND USE
4.1 Specifications for aggregates require obtaining representative portions of the supply 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 descriptive and quality tests. Failure to carefully follow the procedures in this practice could result in providing a non-representative 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, 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 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. These techniques are intended to minimize variations in measured characteristics between the test samples 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C702/C702M − 18 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 C128 Test Method for Relative Density (Specific Gravity)
and Absorption of Fine Aggregate
1.1 This practice covers three methods for the reduction of
D75 Practice for Sampling Aggregates
large samples of aggregate to the appropriate size for testing.
E11 Specification for Woven Wire Test Sieve Cloth and Test
These techniques are intended to minimize variations in
Sieves
measured characteristics between the test samples selected and
the large sample.
3. Terminology
1.2 The values stated in either SI units or inch-pound units
3.1 Definitions—The terms used in this practice are defined
are to be regarded separately as standard. The values stated in
in Terminology C125.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
4. Significance and Use
values from the two systems may result in non-conformance
4.1 Specificationsforaggregatesrequireobtainingrepresen-
with the standard.
tative portions of the supply material for testing. Other factors
NOTE 1—Sieve size is identified by its standard designation in Speci-
being equal, larger samples will tend to be more representative
fication E11. The alternative designation given in parentheses is for
of the total supply. This practice provides procedures for
information only and does not represent a different standard sieve size.
reducing the large sample obtained in the field, or produced in
1.3 This standard does not purport to address all of the
the laboratory, to a convenient size for conducting a number of
safety concerns, if any, associated with its use. It is the
descriptive and quality tests. Failure to carefully follow the
responsibility of the user of this standard to establish appro-
procedures in this practice could result in providing a non-
priate safety, health, and environmental practices and deter-
representative sample to be used in subsequent testing. The
mine the applicability of regulatory limitations prior to use.
individual test methods provide for minimum amount of
1.4 This international standard was developed in accor-
material to be tested.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.2 Under certain circumstances, reduction in size of the
Development of International Standards, Guides and Recom-
large sample prior to testing is not recommended. Substantial
mendations issued by the World Trade Organization Technical
differences between the selected test samples sometimes can-
Barriers to Trade (TBT) Committee.
not be avoided, for example, in the case of an aggregate having
relatively few large size particles in the sample. The laws of
2. Referenced Documents
chance dictate that these few particles may be unequally
2
distributed among the reduced size test samples. Similarly, if
2.1 ASTM Standards:
the test sample is being examined for certain contaminants
C125 Terminology Relating to Concrete and Concrete Ag-
occurring in only small percentages, caution should be used in
gregates
interpreting results from the reduced size test sample. Chance
inclusion or exclusion of only one or two particles in the
1
selected test sample may importantly influence interpretation
This practice is under the jurisdiction of ASTM Committee C09 on Concrete
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.20on
of the characteristics of the original sample. In these cases, the
Aggregates.
entire original sample should be tested.
Current edition approved Feb. 1, 2018. Published March 2018. Originally
approved in 1971. Last previous edition approved in 2011 as C702/C702M–11.
5. Selection of Method
DOI: 10.1520/C0702_C0702M-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Fine Aggregate—Reduce the size of samples of fine
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
aggregate that are drier than the saturated-surface-dry condi-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
...
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.
Designation: C702/C702M − 11 C702/C702M − 18 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
1.1 This practice covers three methods for the reduction of large samples of aggregate to the appropriate size for testing
employingtesting. These 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C125 Terminology Relating to Concrete and Concrete Aggregates
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
D75 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 obtaining representative portions of the supply 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. descriptive and quality tests. Failure to carefully follow the procedures in this
practice could result in providing a nonrepresentativenon-representative sample to be used in subsequent testing. The individual
test methods provide for minimum amount of material to be tested.
1
This practice is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.20 on Normal
Weight Aggregates.
Current edition approved Aug. 1, 2011Feb. 1, 2018. Published September 2011March 2018. Originally approved in 1971. Last previous edition approved in 20032011 as
C702–98(2003).C702/C702M–11. DOI: 10.1520/C0702_C0702M-11.10.1520/C0702_C0702M-18.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C702/C702M − 18
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 c
...
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