ASTM D6926-04
(Practice)Standard Practice for Preparation of Bituminous Specimens Using Marshall Apparatus
Standard Practice for Preparation of Bituminous Specimens Using Marshall Apparatus
SIGNIFICANCE AND USE
Compacted bituminous mixture specimens molded by this procedure are used for various physical tests such as stability, flow, indirect tensile strength, fatigue, creep, and modulus. Density and voids analysis are also conducted on specimens for mixture design and evaluation of field compaction.
Note 1—Uncompacted mixtures are used for determination of theoretical maximum specific gravity.
SCOPE
1.1 This practice covers preparation and compaction of 102 mm (4 in.) diameter by nominal 64 mm (2.5 in.) high cylindrical bituminous paving mixture specimens by means of the original manual Marshall method and subsequent variations of the method. This practice is intended for use with laboratory and plant produced bituminous mixtures with aggregate up to 25 mm (1 in.) maximum size and for recompaction of asphalt pavement samples.
1.2 There are three types of Marshall compaction apparatus in use. The following types of hammer arrangements are included in this practice:
1.2.1 Manually held hammer handle attached to a flat compaction foot through a spring loaded swivel and is hand operated (original standard developed by the Corps of Engineers).
1.2.2 Hammer handle restrained laterally (fixed) but not vertically attached to a flat compaction foot through a spring loaded swivel and is either mechanically or hand operated. There may or may not be a constant surcharge on top of the hammer handle. Mechanical hammers are available that operate at (1) nominal 55 blows per minute and (2) equal to or greater than 75 blows per minute.
1.2.3 Hammer handle restrained laterally (fixed) with constant surcharge on top of hammer, a slanted compaction foot, rotating mold base, and is mechanically operated.
1.3 Although the mass and height of mass drop for each apparatus are the same, density achieved in compacted specimens with the same number of blows will be different. It is up to the user to establish the specific required number of blows to be used for compaction of the specimen in relation to the field.
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Standards Content (Sample)
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Designation:D6926–04
Standard Practice for
Preparation of Bituminous Specimens Using Marshall
1
Apparatus
This standard is issued under the fixed designation D6926; 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.
1. Scope D2171 Test Method for Viscosity of Asphalts by Vacuum
Capillary Viscometer
1.1 This practice covers preparation and compaction of 102
D2493 Standard Viscosity-Temperature Chart for Asphalts
mm (4 in.) diameter by nominal 64 mm (2.5 in.) high
D4402 Test Method for Viscosity Determination ofAsphalt
cylindrical bituminous paving mixture specimens by means of
at Elevated Temperatures Using a Rotational Viscometer
theoriginalmanualMarshallmethodandsubsequentvariations
E11 SpecificationforWovenWireTestSieveClothandTest
of the method.This practice is intended for use with laboratory
Sieves
and plant produced bituminous mixtures with aggregate up to
25 mm (1 in.) maximum size and for recompaction of asphalt
3. Significance and Use
pavement samples.
3.1 Compacted bituminous mixture specimens molded by
1.2 There are three types of Marshall compaction apparatus
this procedure are used for various physical tests such as
in use. The following types of hammer arrangements are
stability, flow, indirect tensile strength, fatigue, creep, and
included in this practice:
modulus. Density and voids analysis are also conducted on
1.2.1 Manually held hammer handle attached to a flat
specimens for mixture design and evaluation of field compac-
compaction foot through a spring loaded swivel and is hand
tion.
operated (original standard developed by the Corps of Engi-
neers).
NOTE 1—Uncompacted mixtures are used for determination of theo-
1.2.2 Hammer handle restrained laterally (fixed) but not retical maximum specific gravity.
vertically attached to a flat compaction foot through a spring
4. Apparatus
loaded swivel and is either mechanically or hand operated.
4.1 Specimen Mold Assembly—Mold cylinders, base plates,
There may or may not be a constant surcharge on top of the
and extension collars shall conform to the details shown in Fig.
hammer handle. Mechanical hammers are available that oper-
1.
ate at (1) nominal 55 blows per minute and (2) equal to or
4.2 SpecimenExtractor—The specimen extractor shall have
greater than 75 blows per minute.
a steel disk that will enter the mold without binding and not be
1.2.3 Hammer handle restrained laterally (fixed) with con-
1
less than 100 mm (3.95 in.) in diameter and 12.5 mm ( ⁄2 in.)
stant surcharge on top of hammer, a slanted compaction foot,
thick. The steel disk is used for extracting compacted speci-
rotating mold base, and is mechanically operated.
mens from molds with the use of the mold collar.Any suitable
1.3 Although the mass and height of mass drop for each
extraction device such as a hydraulic jack apparatus or a lever
apparatus are the same, density achieved in compacted speci-
arm device may be used, provided the specimens are not
mens with the same number of blows will be different. It is up
deformed during the extraction process.
to the user to establish the specific required number of blows to
4.3 Compaction Hammers:
be used for compaction of the specimen in relation to the field.
4.3.1 Compaction Hammers with a Manually Held (Type 1)
2. Referenced Documents
orFixed(Type2)Handle,eithermechanicallyorhandoperated
2
2.1 ASTM Standards: as generally shown in Fig. 2, shall have a flat, circular
compaction foot with spring loaded swivel and a 4.54 6 0.01
kg (10 6 0.02 lb) sliding mass with a free fall of 457.2 6 1.5
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
mm (18 6 0.06 in.) (see Fig. 2 for hammer tolerances). A
Paving Materials and is the direct responsibility of Subcommittee D04.20 on
mechanical hammer is shown in Fig. 3.
Mechanical Tests of Bituminous Mixes.
Current edition approved Aug. 1, 2004. Published August 2004. DOI: 10.1520/
NOTE 2—Manual compaction hammers should be equipped with a
D6926-04.
2
finger safety guard.
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.
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D6926–04
mm in.
A 104.1 to 105.4 4.100 to 4.150
B 109.1 to 110.2 4.295 to 3.439
C 114.0 to 115.8 4.490 to 4.560
D 107.0 to 109.7 4.211 to 4.320
E 101.3 to 101.7 3.990 to 4.005
F 119.9 to 121.4 4.
...
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