ASTM D7981-15
(Practice)Standard Practice for Compaction of Prismatic Asphalt Specimens by Means of the Shear Box Compactor
Standard Practice for Compaction of Prismatic Asphalt Specimens by Means of the Shear Box Compactor
SIGNIFICANCE AND USE
5.1 Asphalt prisms compacted with the Shear Box Compactor can be used to obtain specimens for further testing, including bulk specific gravity following Test Methods D6752 and D2726, Dynamic modulus following AASHTO T342, dynamic modulus, flow number, and flow time following AASHTO TP79, and fatigue performance characteristics following AASHTO T321.
5.2 Specimens to perform other standard tests could also be obtained, as long as their volume is contained within the volume of a prism having maximum width, length and height (W×L×H) of 150 mm, 450 mm, and 185 mm, respectively.
Note 1: The aggregate orientation in the samples produced by this method maybe different from samples produced by other laboratory compaction methods. This should be considered when comparing mechanical test results from different compaction methods.
Note 2: The quality of the results produced by this standard 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 standard are cautioned that compliance with Specification D3666 alone does not completely assure reliable results. Reliable results depend on many factors chr(59). 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 the fabrication of prismatic specimens of asphalt mixture using the Shear Box Compactor (SBC). Compacted specimens are suitable for volumetric and physical property testing. This standard practice should not be used for acceptance or rejection of a material or for purchasing purposes.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard with exception of degrees (°) where angle is specified.
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.
1.4 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.
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Designation: D7981 − 15
Standard Practice for
Compaction of Prismatic Asphalt Specimens by Means of
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the Shear Box Compactor
This standard is issued under the fixed designation D7981; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D6857Test Method for Maximum Specific Gravity and
Density of Bituminous Paving Mixtures UsingAutomatic
1.1 This practice covers the fabrication of prismatic speci-
Vacuum Sealing Method
mens of asphalt mixture using the Shear Box Compactor
D6925Test Method for Preparation and Determination of
(SBC). Compacted specimens are suitable for volumetric and
theRelativeDensityofAsphaltMixSpecimensbyMeans
physical property testing. This standard practice should not be
of the Superpave Gyratory Compactor
usedforacceptanceorrejectionofamaterialorforpurchasing
E644Test Methods for Testing Industrial Resistance Ther-
purposes.
mometers
1.2 Units—The values stated in SI units are to be regarded
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2.2 AASHTO Standards:
asstandard.Nootherunitsofmeasurementareincludedinthis
AASHTO TP79Standard Method of Test for Determining
standardwithexceptionofdegrees(°)whereangleisspecified.
the Dynamic Modulus and Flow Number for Hot Mix
1.3 This standard does not purport to address all of the
Asphalt (HMA) Using the Asphalt Mixture Performance
safety concerns, if any, associated with its use. It is the
Tester
responsibility of the user of this standard to establish appro-
AASHTO T321Standard Method of Test for Determining
priate safety and health practices and determine the applica-
the Fatigue Life of Compacted Hot Mix Asphalt (HMA)
bility of regulatory limitations prior to use.
Subjected to Repeated Flexural Bending
1.4 The text of this standard references notes and footnotes
AASHTO T342Standard Method of Test for Determining
which provide explanatory material. These notes and footnotes
DynamicModulusofHotMixAsphaltConcreteMixtures
(excluding those in tables and figures) shall not be considered
as requirements of the standard.
3. Terminology
3.1 Definitions:
2. Referenced Documents
3.1.1 load cycle—the angular movement of the shearing
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2.1 ASTM Standards:
platensinthecompactorgoingfromtheverticalpositiontothe
D1188TestMethodforBulkSpecificGravityandDensityof
positionofmaximumshearangleatoneside,thengoingtothe
Compacted Bituminous Mixtures Using Coated Samples
maximum shear angle at the other side and back to the vertical
D2041Test Method for Theoretical Maximum Specific
position (90 6 0.25° with reference to the horizontal plane).
Gravity and Density of Bituminous Paving Mixtures
3.1.2 shear angle—the external angle measured between a
D2726Test Method for Bulk Specific Gravity and Density
vertical plane (angle of 90° with respect to a horizontal plane)
of Non-Absorptive Compacted Bituminous Mixtures
and the plane formed by a shearing plate in the compactor
D3666Specification for Minimum Requirements for Agen-
when it has reached its maximum travel. Set at 4°.
cies Testing and Inspecting Road and Paving Materials
D6752Test Method for Bulk Specific Gravity and Density
4. Summary of Practice
of Compacted Bituminous Mixtures Using Automatic
Vacuum Sealing Method
4.1 A sample of loose asphalt mixture is compacted in a
fully automatic apparatus by the combination of a static
vertical force and a horizontal cyclic shear force applied to
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This practice is under the jurisdiction ofASTM Committee D04 on Road and
twin vertical parallel platens up to a fixed maximum shear
Paving Materials and is the direct responsibility of Subcommittee D04.20 on
Mechanical Tests of Asphalt Mixtures. angle,toproduceaprismaticspecimenofcompactedasphaltto
Current edition approved Aug. 1, 2015. Published September 2015. DOI:
10.1520/D7981-15.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Association of State Highway and Transportation
Standards volume information, refer to the standard’s Document Summary page on Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
the ASTM website. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7981 − 15
a target uncorrected density (that is, based on the geometric components: (1) reaction frame, (2) fully integrated loading
volume of the specimen). system,includingloadingrams,controlleranddataacquisition
to record vertical force applied, height measurements and
5. Significance and Use
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