ASTM D7172-06e1
(Test Method)Standard Test Method for Determining The Relative Density (Specific Gravity) And Absorption Of Fine Aggregates Using Infrared
Standard Test Method for Determining The Relative Density (Specific Gravity) And Absorption Of Fine Aggregates Using Infrared
SIGNIFICANCE AND USE
Bulk relative density (specific gravity) is the characteristic generally used for calculation of the volume occupied by the aggregate in various mixtures containing aggregate including Portland cement concrete, bituminous concrete, and other mixtures that are proportioned or analyzed on an absolute volume basis. Bulk relative density (specific gravity) is used in the computation of voids in aggregate in C 1252 and C 29/ C 29M. Bulk relative density (specific gravity) determined on the saturated surface dry (SSD) basis is used if the aggregate is wet, that is, if its absorption has been satisfied. Conversely, the bulk relative density (specific gravity) determined on the oven-dry basis is used for computations when the aggregate is dry or assumed to be dry.
Apparent relative density (specific gravity) pertains to the relative density of the solid material making up the constituent particles not including the pore space within the particles that is accessible to water. This value is not widely used in construction aggregate technology.
Water absorption values are used to calculate the change in the mass of an aggregate due to water absorbed in the pore spaces within the constituent particles, compared to the dry condition, when it is deemed that the aggregate has been in contact with water long enough to satisfy most of the absorption potential. The laboratory standard for absorption is that obtained after submerging dry aggregate for approximately 24 hours in water. Aggregates mined from below the water table may have a higher absorption when used, if not allowed to dry. Conversely, some aggregates when used may contain an amount of absorbed moisture less than the 24 hours soaked condition: For an aggregate that has been in contact with water and that had free moisture on the particle surface, the percentage of free moisture can be determined by deducting the absorption from the total moisture content determined according to C 566 by drying.
SCOPE
1.1 This test method covers the determination of the relative density (specific gravity) and absorption of fine aggregates.
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 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.
General Information
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Standards Content (Sample)
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Designation:D7172 −06
StandardTest Method for
Determining The Relative Density (Specific Gravity) And
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Absorption Of Fine Aggregates Using Infrared
This standard is issued under the fixed designation D7172; 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—“2 in.” was editorially corrected to “27 in.” in Section 9.3.9 in March 2009.
1. Scope D4753 Guide for Evaluating, Selecting, and Specifying Bal-
ances and Standard Masses for Use in Soil, Rock, and
1.1 Thistestmethodcoversthedeterminationoftherelative
Construction Materials Testing
density (specific gravity) and absorption of fine aggregates.
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2.2 AASHTO Standards:
1.2 The values stated in SI units are to be regarded as the
T-84 Test Method for Specific Gravity and Absorption of
standard.
Fine Aggregate
1.3 This standard does not purport to address all of the
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2.3 Other Documents:
safety concerns, if any, associated with its use. It is the
Operational Instructions
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use.
3.1 Definitions—As defined in C125 and D8
2. Referenced Documents
3.1.1 Automatic Volumetric Mixer (AVM), n—an automated
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unit to hold and agitate a volumetric flask while applying a
2.1 ASTM Standards:
vacuum to the flask.
C29/C29M Test Method for Bulk Density (“Unit Weight”)
and Voids in Aggregate
4. Significance and Use
C125 Terminology Relating to Concrete and Concrete Ag-
gregates
4.1 Bulk relative density (specific gravity) is the character-
C128 Test Method for Density, Relative Density (Specific
istic generally used for calculation of the volume occupied by
Gravity), and Absorption of Fine Aggregate
the aggregate in various mixtures containing aggregate includ-
C566 Test Method forTotal Evaporable Moisture Content of
ing Portland cement concrete, bituminous concrete, and other
Aggregate by Drying
mixtures that are proportioned or analyzed on an absolute
C670 Practice for Preparing Precision and Bias Statements
volume basis. Bulk relative density (specific gravity) is used in
for Test Methods for Construction Materials
the computation of voids in aggregate in C1252 and C29/
C702 PracticeforReducingSamplesofAggregatetoTesting
C29M. Bulk relative density (specific gravity) determined on
Size
the saturated surface dry (SSD) basis is used if the aggregate is
C1252 Test Methods for Uncompacted Void Content of Fine
wet, that is, if its absorption has been satisfied. Conversely, the
Aggregate (as Influenced by Particle Shape, Surface
bulk relative density (specific gravity) determined on the oven-
Texture, and Grading)
dry basis is used for computations when the aggregate is dry or
D8 Terminology Relating to Materials for Roads and Pave-
assumed to be dry.
ments
4.2 Apparent relative density (specific gravity) pertains to
D75 Practice for Sampling Aggregates
the relative density of the solid material making up the
constituent particles not including the pore space within the
particles that is accessible to water. This value is not widely
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This test method is under the jurisdiction of ASTM Committee D04 on Road
used in construction aggregate technology.
and Paving Materials and is the direct responsibility of Subcommittee D04.51 on
Aggregate Tests.
Current edition approved Feb. 15, 2006. Published March 2006. DOI: 10.1520/
D7172-06E01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Association of State Highway and Transportation
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001.
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Standards volume information, refer to the standard’s Document Summary page on Available from Barnstead International, 2555 Kerper Boulevard, P.O. Box 797,
the ASTM website. Dubuque, Iowa 52004-0797, U.S.A.
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D7172−06
4.3 Water absorption values are used to calculate the change 7. Preparation of Test Specimen
in the mass of an aggregate due to water absorbed in the pore
7.1 Obtain 1.5 kg 6 10 g of the fine aggregate from the
spaces within the constituent particles, compared to the dry
sample using the applicable procedures described in Practice
condition, when it is deemed that the aggregate has been in
C702.
contact with water long enough to satisfy most of the absorp-
7.2 Dry it in a suitable pan or ve
...
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