ASTM D6926-20
(Practice)Standard Practice for Preparation of Asphalt Mixture Specimens Using Marshall Apparatus
Standard Practice for Preparation of Asphalt Mixture Specimens Using Marshall Apparatus
SIGNIFICANCE AND USE
4.1 Compacted asphalt 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 void analysis are also conducted on specimens for mixture design and evaluation of field compaction.
Note 3: Uncompacted mixtures are used for determination of theoretical maximum specific gravity.
Note 4: The quality of the results produced by this practice are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this practice are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.
SCOPE
1.1 This practice covers preparation and compaction of 4 in. (101.6 mm) diameter by nominal 2.5 in. (63.5 mm) high cylindrical asphalt paving mixture specimens. This practice is intended for use with laboratory and plant-produced asphalt mixtures with aggregate up to 1 in. (25.4 mm) maximum size and for recompaction of asphalt paving mixture samples.
Note 1: Historically, 35, 50, and 75 blows per face has been practiced for this test.
Note 2: Manufacturers do not recommend applying an excessive number of blows per face of a sample. This practice has been known to cause fatigue and damage to machine components.
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 (Type 1) is attached to a flat compaction foot through a spring-loaded swivel and is hand operated (see 5.3.1) (original standard developed by the United States Army Corps of Engineers).
1.2.2 Hammer handle restrained laterally (fixed) but not vertically (Type 2), attached to a flat compaction foot through a spring-loaded swivel and is either mechanically or hand operated (see 5.3.2). There may or may not be a constant surcharge on top of the hammer handle. Mechanical hammers (Type 2) are available that operate at a range of 55 to 68 blows per minute.
1.2.3 Hammer handle restrained laterally (fixed) with or without constant surcharge on top of hammer, is attached to a slanted compaction foot on a rotating mold base (Type 3), and is mechanically operated (see 5.3.3). This method must be used as a referee method.
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 owner or specifier to establish the specific required number of blows to be used for compaction of the specimen in relation to the field.
1.4 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.6 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: D6926 − 20
Standard Practice for
Preparation of Asphalt Mixture 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 to the owner or specifier to establish the specific required
number of blows to be used for compaction of the specimen in
1.1 This practice covers preparation and compaction of 4 in.
relation to the field.
(101.6 mm) diameter by nominal 2.5 in. (63.5 mm) high
1.4 Units—The values stated in inch-pound units are to be
cylindrical asphalt paving mixture specimens. This practice is
regarded as standard. The values given in parentheses are
intended for use with laboratory and plant-produced asphalt
mathematical conversions to SI units that are provided for
mixtures with aggregate up to 1 in. (25.4 mm) maximum size
information only and are not considered standard.
and for recompaction of asphalt paving mixture samples.
1.5 The text of this standard references notes and footnotes
NOTE 1—Historically, 35, 50, and 75 blows per face has been practiced
which provide explanatory material. These notes and footnotes
for this test.
(excluding those in tables and figures) shall not be considered
NOTE 2—Manufacturers do not recommend applying an excessive
number of blows per face of a sample. This practice has been known to
as requirements of the standard.
cause fatigue and damage to machine components.
1.6 This international standard was developed in accor-
1.2 There are three types of Marshall compaction apparatus
dance with internationally recognized principles on standard-
in use. The following types of hammer arrangements are
ization established in the Decision on Principles for the
included in this practice:
Development of International Standards, Guides and Recom-
1.2.1 Manually held hammer handle (Type 1) is attached to mendations issued by the World Trade Organization Technical
a flat compaction foot through a spring-loaded swivel and is
Barriers to Trade (TBT) Committee.
hand operated (see 5.3.1) (original standard developed by the
United States Army Corps of Engineers).
2. Referenced Documents
2
1.2.2 Hammer handle restrained laterally (fixed) but not
2.1 ASTM Standards:
vertically (Type 2), attached to a flat compaction foot through
D8 Terminology Relating to Materials for Roads and Pave-
a spring-loaded swivel and is either mechanically or hand
ments
operated (see 5.3.2). There may or may not be a constant
D3666 Specification for Minimum Requirements for Agen-
surcharge on top of the hammer handle. Mechanical hammers
cies Testing and Inspecting Road and Paving Materials
(Type 2) are available that operate at a range of 55 to 68 blows
D4402/D4402M TestMethodforViscosityDeterminationof
per minute.
Asphalt at Elevated Temperatures Using a Rotational
1.2.3 Hammer handle restrained laterally (fixed) with or
Viscometer
without constant surcharge on top of hammer, is attached to a
D6927 Test Method for Marshall Stability and Flow of
slanted compaction foot on a rotating mold base (Type 3), and
Asphalt Mixtures
ismechanicallyoperated(see5.3.3).Thismethodmustbeused
E1 Specification for ASTM Liquid-in-Glass Thermometers
as a referee method.
E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
1.3 Although the mass and height of mass drop for each
E77 Test Method for Inspection and Verification of Ther-
apparatus are the same, density achieved in compacted speci-
mometers
mens with the same number of blows will be different. It is up
E2251 Specification for Liquid-in-Glass ASTM Thermom-
eters with Low-Hazard Precision Liquids
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
Paving Materials and is the direct responsibility of Subcommittee D04.20 on
2
Mechanical Tests of Asphalt Mixtures. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2020. Published January 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2004. Last previous edition approved in 2016 as D6926 – 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6926-20. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6926 − 20
3. Terminology lessthan3.95in.(
...
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: D6926 − 16 D6926 − 20
Standard Practice for
Preparation of Asphalt Mixture 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
1.1 This practice covers preparation and compaction of 4 in. (101.6 mm) diameter by nominal 2.5 in. (63.5 mm) high cylindrical
asphalt paving mixture specimens. This practice is intended for use with laboratory and plant-produced asphalt mixtures with
aggregate up to 1 in. (25.4 mm) maximum size and for recompaction of asphalt paving mixture samples.
NOTE 1—Historically, 35, 50, and 75 blows per face has been practiced for this test.
NOTE 2—Manufacturers do not recommend applying an excessive number of blows per face of a sample. This practice has been known to cause fatigue
and damage to machine components.
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 (Type 1) is attached to a flat compaction foot through a spring-loaded swivel and is hand
operated (see 5.3.1) (original standard developed by the United States Army Corps of Engineers).
1.2.2 Hammer handle restrained laterally (fixed) but not vertically, vertically (Type 2), attached to a flat compaction foot through
a spring-loaded swivel and is either mechanically or hand operated. operated (see 5.3.2). There may or may not be a constant
surcharge on top of the hammer handle. Mechanical hammers (Type 2) are available that operate at (1)a nominal 55 blows per
minute or range of 55 (2) equal to or greater than 75 to 68 blows per minute.
1.2.3 Hammer handle restrained laterally (fixed) with or without constant surcharge on top of hammer, is attached to a slanted
compaction foot on a rotating mold base, base (Type 3), and is mechanically operated. operated (see 5.3.3). This method must be
used as a referee method.
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 owner or specifier to establish the specific required number of blows
to be used for compaction of the specimen in relation to the field.
1.4 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.6 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:
D8 Terminology Relating to Materials for Roads and Pavements
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D4402D4402/D4402M Test Method for Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational
Viscometer
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.20 on Mechanical
Tests of Asphalt Mixtures.
Current edition approved Dec. 15, 2016Jan. 1, 2020. Published January 2017January 2020. Originally approved in 2004. Last previous edition approved in 20102016 as
D6926 – 10.D6926 – 16. DOI: 10.1520/D6926-16.10.1520/D6926-20.
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
1
---------------------- Page: 1 ----------------------
D6926 − 20
D6927 Test Method for Marshall Stability and Flow of Asphalt Mixtures
E1 Spec
...
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