ASTM C702-98

Standard Practice for Reducing Samples of Aggregate to Testing Size

SCOPE
1.1 This practice describes 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 SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Historical
• Publication Date: 09-May-1998
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.20 - Aggregates

Relations

• Replaced By: ASTM C702-98(2003) - Standard Practice for Reducing Samples of Aggregate to Testing Size
• Effective Date: 10-May-1998
• Referred By: ASTM D4943-18 - Standard Test Method for Shrinkage Factors of Cohesive Soils by the Water Submersion Method
• Effective Date: 10-May-1998
• Referred By: ASTM C127-15 - Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate (Withdrawn 2024)
• Effective Date: 10-May-1998
• Referred By: ASTM C928/C928M-20a - Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious Materials for Concrete Repairs
• Effective Date: 10-May-1998
• Referred By: ASTM D4318-17e1 - Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils
• Effective Date: 10-May-1998
• Referred By: ASTM C1084-19 - Standard Test Method for Portland-Cement Content of Hardened Hydraulic-Cement Concrete
• Effective Date: 10-May-1998
• Referred By: ASTM C131/C131M-20 - Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine
• Effective Date: 10-May-1998
• Referred By: ASTM D1140-17 - Standard Test Methods for Determining the Amount of Material Finer than 75-μm (No. 200) Sieve in Soils by Washing
• Effective Date: 10-May-1998
• Referred By: ASTM D7382-20 - Standard Test Methods for Determination of Maximum Dry Unit Weight of Granular Soils Using a Vibrating Hammer
• Effective Date: 10-May-1998
• Referred By: ASTM C110-20 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
• Effective Date: 10-May-1998
• Referred By: ASTM D546-17 - Standard Test Method for Sieve Analysis of Mineral Filler for Asphalt Paving Mixtures
• Effective Date: 10-May-1998
• Referred By: ASTM C1105-08a(2016) - Standard Test Method for Length Change of Concrete Due to Alkali-Carbonate Rock Reaction
• Effective Date: 10-May-1998
• Referred By: ASTM C136/C136M-19 - Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates
• Effective Date: 10-May-1998
• Referred By: ASTM D1074-17 - Standard Test Method for Compressive Strength of Asphalt Mixtures
• Effective Date: 10-May-1998
• Referred By: ASTM D2487-17e1 - Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
• Effective Date: 10-May-1998

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 702 – 98 American Association State
Highway and Transportation
Officials Standard: T 248
Standard Practice for
Reducing Samples of Aggregate to Testing Size
This standard is issued under the fixed designation C 702; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope The individual test methods provide for minimum amount of
material to be tested.
1.1 This practice describes three methods for the reduction
4.2 Under certain circumstances, reduction in size of the
of large samples of aggregate to the appropriate size for testing
large sample prior to testing is not recommended. Substantial
employing techniques that are intended to minimize variations
differences between the selected test samples sometimes can-
in measured characteristics between the test samples so se-
not be avoided, as for example, in the case of an aggregate
lected and the large sample.
having relatively few large size particles in the sample. The
1.2 The values stated in SI units are to be regarded as the
laws of chance dictate that these few particles may be
standard.
unequally distributed among the reduced size test samples.
1.3 This standard does not purport to address all of the
Similarly, if the test sample is being examined for certain
safety concerns, if any, associated with its use. It is the
contaminants occurring as a few discrete fragments in only
responsibility of the user of this standard to establish appro-
small percentages, caution should be used in interpreting
priate safety and health practices and determine the applica-
results from the reduced size test sample. Chance inclusion or
bility of regulatory limitations prior to use.
exclusion of only one or two particles in the selected test
2. Referenced Documents sample may importantly influence interpretation of the charac-
teristics of the original sample. In these cases, the entire
2.1 ASTM Standards:
original sample should be tested.
C 125 Terminology Relating to Concrete and Concrete
Aggregates
5. Selection of Method
C 128 Test Method for Specific Gravity and Absorption of
2 5.1 Fine Aggregate—Reduce the size of samples of fine
Fine Aggregate
aggregate that are drier than the saturated-surface-dry condi-
D 75 Practice for Sampling Aggregates
tion (Note 1) using a mechanical splitter according to Method
3. Terminology
A. Reduce the size of samples having free moisture on the
particle surfaces by quartering according to Method B, or by
3.1 Definitions—The terms used in this practice are defined
treating as a miniature stockpile as described in Method C.
in Terminology C 125.
5.1.1 If the use of Method B or Method C is desired, and the
4. Significance and Use
sample does not have free moisture on the particle surfaces,
moisten the sample to obtain free moisture on the particle
4.1 Specifications for aggregates require sampling portions
surfaces, mix thoroughly, and then reduce the sample size.
of the material for testing. Other factors being equal, larger
5.1.2 If use of Method A is desired and the sample has free
samples will tend to be more representative of the total supply.
moisture on the particle surfaces, dry the entire sample to at
This practice provides procedures for reducing the large
least the saturated-surface-dry condition, using temperatures
sample obtained in the field or produced in the laboratory to a
that do not exceed those specified for any of the tests
convenient size for conducting a number of tests to describe the
contemplated, and then reduce the sample size. Alternatively, if
material and measure its quality in a manner that the smaller
the moist sample is very large, make a preliminary split using
test sample portion is most likely to be a representation of the
a mechanical splitter having chute openings of 38 mm (1 ⁄2 in.)
larger sample, and thus of the total supply. Failure to carefully
or more in width to reduce the sample to not less than 5000 g.
follow the procedures in this practice could result in providing
Dry the portion so obtained, and reduce it to test sample size
a nonrepresentative sample to be used in subsequent testing.
using Method A.
1 NOTE 1—The method of determining the saturated-surface-dry condi-
This practice is under the jurisdiction of ASTM Committee C-9 on Concrete
tion is described in Test Method C 128. As a quick approximation, if the
and Concrete Aggregatesand is the direct responsibility of Subcommittee C09.20on
Normal Weight Aggregates. fine aggregate will retain its shape when molded in the hand, it may be
Current edition approved May 10, 1998. Published December 1998. Originally
considered to be wetter than saturated-surface-dry.
published as C 702 – 71 T. Last previous edition C 702 – 93.
5.2 Coarse Aggregates and Mixtures of Coarse and Fine
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.03. Aggregates—Reduce the sample using a mechanical splitter in
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 702
accordance with Method A (preferred method) or by quartering 8. Procedure
in accordance with Method B. The miniature stockpile Method
8.1 Place the original sample in the hopper or pan and
C is not permitted for coarse aggregates or mixtures of coarse
uniformly distribute it from edge to edge, so that when it is
and fine aggregates.
introduced into the chutes, approximately equal amounts will
flow through each chute. Introduce the sample at a rate so as to
6. Sampling
allow free flowing through the chutes and into the receptacles
6.1 Obtain samples of aggregate in the field in accordance
below. Reintroduce the portion of the sample in one of the
with Practice D 75, or as required by individual test methods.
receptacles into the splitter as many times as necessary to
When tests for sieve analysis only are contemplated, the size of
reduce the sample to the size specified for the intended test.
field sample listed in Practice D 75 is usually adequate. When
Reserve the portion of material collected in the other receptacle
additional tests are to be conducted, the user shall be satisfied
for reduction in size for other tests, when required.
that the initial size of the field sample is adequate to accom-
plish all intended tests. Use similar procedures for aggrega
...