ASTM D7229-06
(Test Method)Standard Test Method for Preparation and Determination of the Bulk Specific Gravity of Dense-Graded Cold Mix Asphalt (CMA) Specimens by Means of the Superpave Gyratory Compactor
Standard Test Method for Preparation and Determination of the Bulk Specific Gravity of Dense-Graded Cold Mix Asphalt (CMA) Specimens by Means of the Superpave Gyratory Compactor
SIGNIFICANCE AND USE
This test method is used to prepare specimens for determination of the bulk specific gravity of a cured compacted specimen. It covers modifications to Test Method D 6925 for preparation of CMA by means of the SGC.
This test method is useful for monitoring the density of the specimen during the compaction process. It is suitable for laboratory design and field control of CMA.
Local end-use specifications should be developed to establish conformance to the job and user requirements.
SCOPE
1.1 This test method concerns the preparation and compaction of cylindrical specimens of dense-graded cold mix asphalt (CMA) using the Superpave gyratory compactor (SGC).
1.2 This test method is applicable for road mixes or plant mixes prepared at ambient temperatures.
1.3 This test method also refers to the determination of the bulk specific gravity of the compacted CMA.
1.4 The values given in SI units are to be considered the standard.
1.5 A precision and bias statement for this test method has not been developed at this time. Therefore, this test method should not be used for acceptance or rejection of a material for purchasing purposes.
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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Standards Content (Sample)
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Designation: D 7229 – 06
Standard Test Method for
Preparation and Determination of the Bulk Specific Gravity
of Dense-Graded Cold Mix Asphalt (CMA) Specimens by
Means of the Superpave Gyratory Compactor
This standard is issued under the fixed designation D 7229; 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 D 2397 Specification for Cationic Emulsified Asphalt
D 2489 Practice for Estimating Degree of Particle Coating
1.1 This test method concerns the preparation and compac-
of Bituminous-Aggregate Mixtures
tion of cylindrical specimens of dense-graded cold mix asphalt
D 2726 Test Method for Bulk Specific Gravity and Density
(CMA) using the Superpave gyratory compactor (SGC).
of Non-Absorptive Compacted Bituminous Mixtures
1.2 This test method is applicable for road mixes or plant
D 3203 Test Method for Percent Air Voids in Compacted
mixes prepared at ambient temperatures.
Dense and Open Bituminous Paving Mixtures
1.3 This test method also refers to the determination of the
D 3628 Practice for Selection and Use of Emulsified As-
bulk specific gravity of the compacted CMA.
phalts
1.4 The values given in SI units are to be considered the
D 4215 Specification for Cold-Mixed, Cold-Laid Bitumi-
standard.
nous Paving Mixtures
1.5 A precision and bias statement for this test method has
D 6752 Test Method for Bulk Specific Gravity and Density
not been developed at this time. Therefore, this test method
of Compacted Bituminous Mixtures Using Automatic
should not be used for acceptance or rejection of a material for
Vacuum Sealing Method
purchasing purposes.
D 6925 Test Method for Preparation and Determination of
1.6 This standard does not purport to address all of the
the Relative Density of Hot Mix Asphalt (HMA) Speci-
safety concerns, if any, associated with its use. It is the
mens by Means of the Superpave Gyratory Compactor
responsibility of the user of this standard to establish appro-
D 6934 Test Method for Residue by Evaporation of Emul-
priate safety and health practices and determine the applica-
sified Asphalt
bility of regulatory limitations prior to use.
D 6998 Practice for Evaluating Aggregate Coating using
2. Referenced Documents Emulsified Asphalts
2.1 ASTM Standards:
3. Terminology
C 566 Test Method for Total Evaporable Moisture Content
3.1 Definitions—Definitions are in accordance with Termi-
of Aggregate by Drying
nologyD8.
D8 Terminology Relating to Materials for Roads and Pave-
3.2 Definitions of Terms Specific to This Standard:
ments
3.2.1 dense-graded aggregate emulsified asphalt cold
D 977 Specification for Emulsified Asphalt
mixtures—mixtures of dense-graded aggregate and emulsified
D 1188 Test Method for Bulk Specific Gravity and Density
asphalt uniformly mixed at or near ambient temperature.
of Compacted Bituminous Mixtures Using Coated
3.2.2 dense-graded cold mix asphalt (CMA)—emulsified
Samples
asphalt that has been mixed with aggregate, dry, and com-
D 2041 Test Method for Theoretical Maximum Specific
pacted by a suitable compacting device.
Gravity and Density of Bituminous Paving Mixtures
3.2.3 nominal maximum aggregate/sieve size—one sieve
size larger than the first sieve to retain more than 10 %.
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.27 on
4. Significance and Use
Cold Mix Asphalts.
4.1 This test method is used to prepare specimens for
Current edition approved July 1, 2006. Published July 2006.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
determinationofthebulkspecificgravityofacuredcompacted
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specimen. It covers modifications to Test Method D 6925 for
Standards volume information, refer to the standard’s Document Summary page on
preparation of CMA by means of the SGC.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D7229–06
4.2 This test method is useful for monitoring the density of 7.2 Coating Test—Preliminary evaluation of the emulsified
the specimen during the compaction process. It is suitable for asphalt selected for mixture preparation is accomplished
laboratory design and field control of CMA. through a coating test. The trial emulsion content as deter-
4.3 Local end-use specifications should be developed to mined in 7.1 is combined with the wet job aggregate corrected
establish conformance to the job and user requirements. to dry weight. Coating is visually estimated by the user as
satisfactory or unsatisfactory for the intended use of the mix
5. Apparatus
(surface mixtures require a greater degree of coating than do
5.1 Superpave Gyratory Compactor—An electrohydyaulic base mixtures). Local end-use specifications or agreement
or electromechanical compactor with a ram and ram heads as between user and supplier should be developed to determine
described in Test Method D 6925. the degree of coating. If the degree of coating is considered
satisfactory, proceed to making the mix. If the coating is
6. Materials
considered unsatisfactory, select another grade of emulsion as
6.1 Aggregates —Dense-graded aggregates meeting the re- described in Practice D 3628 and start over from 7.1.
quirements of Specification D 4215 are among those suitable
NOTE 1—As a general guideline, aggregates not exceeding 20 %
for emulsified asphalt cold mixtures or further guidance should
passing the 0.075-mm sieve can be used for the slow-setting emulsions,
be obtained from the Cold Mix Manual.
and aggregates with less than 10 % passing the 0.075-mm sieve are used
6.2 Emulsions—Two types of emulsified asphalt are used for the medium-setting emulsions. Local end-use specifications should be
developed to finalize these requirements since aggregates vary from
for producing dense-graded emulsified asphalt cold mixtures
region to region.
and their selection are described in Practice D 3628. These are
NOTE 2—Coating may be quantitatively calculated by using the proce-
designated as slow-setting and medium-setting emulsions.
dure described in Practice D 2489.
Medium-settingemulsionsareusedwithaggregatesthatdonot
NOTE 3—The emulsified asphalt/job aggregate coating test in Test
have excessive amounts passing the 0.075-mm sieve. Slow-
Method D 6998 can be used for this screening process.
setting emulsions are normally used with the more dense
7.3 Preparation of Test Specimens—Prepare a specimen
aggregates with larger amounts passing the 0.075-mm sieve.
using the emulsion content determined in 7.1. If the mixture in
Specifications for these emulsions are given in Specifications
the coating tests (7.2) appears to be dry, start with the trial
D 977 and D 2397.
emulsioncontent(7.1).Conversely,ifthemixtureappearsrich,
reduce the emulsion content.
7. Procedure
NOTE 4—A trial emulsion content of 8 % emulsion is a good starting
7.1 Determination of Trial Emulsion Content—If needed, a
point.Othertrialblendscanbe1 %higheror1 %lower.Othertrialblends
simple formula for base mixtures and one for surface mixtures
would then be 9, 8, and 7 % of emulsion content, respectively. A normal
is used. These formulas are based on the percentage of
difference between the emulsion content levels is 1 %, which is a residual
aggregate passing the 4.75-mm sieve and, in most cases, give
difference of 0.65 % for an emulsion with a 65 % residue c
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