ASTM D6995-21
(Test Method)Standard Test Method for Determining Field VMA Based on the Maximum Specific Gravity of an Asphalt Mixture (Gmm)
Standard Test Method for Determining Field VMA Based on the Maximum Specific Gravity of an Asphalt Mixture (G<inf>mm</inf>)
SIGNIFICANCE AND USE
4.1 Various users desire indication of compliance with VMA specifications for hot mix asphalt (HMA) during production.
4.2 The standard practice for determining VMA requires that the bulk specific gravity of the aggregate components be determined. This is a very time-consuming test, which is not suitable for routine QC procedures.
4.3 When an aggregate source used in the mix has a highly variable bulk specific gravity and a reference average bulk specific gravity (Gsb) (for example, as established in the mix design) is used to calculate VMA during HMA production, erroneous values may occur.
4.4 The test for maximum specific gravity of the mix (Gmm) is a routine QC test at HMA plants. The effective specific gravity of the aggregate components (Gse) can be easily calculated from this test. However the Gse does not take into account the amount of asphalt absorbed, which is required for accurate VMA determination. This method provides a means to correct the Gse to account for the average absorbed asphalt. This procedure should not be used if the percent water absorption of the total (combined) aggregates varies between four tests, randomly obtained over a 30 day period, by more than 0.4 %.
SCOPE
1.1 This test method is intended to be used for a rapid field determination of voids in mineral aggregate (VMA) of asphalt mixture. It provides equations for calculating the VMA based on the asphalt content of the mix and its maximum specific gravity (Gmm). It is intended that this should be used for the rapid “field” determination of VMA during quality control (QC) operations at HMA plants, particularly where the specific gravity of the aggregate is highly variable.
Note 1: VMA determined using the rapid field method is VMA that has been corrected for aggregate absorption.
1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 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:D6995 −21
Standard Test Method for
Determining Field VMA Based on the Maximum Specific
1
Gravity of an Asphalt Mixture (G )
mm
This standard is issued under the fixed designation D6995; 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 D2041/D2041M Test Method for Theoretical Maximum
Specific Gravity and Density of Asphalt Mixtures
1.1 This test method is intended to be used for a rapid field
D2172/D2172M TestMethodsforQuantitativeExtractionof
determination of voids in mineral aggregate (VMA) of asphalt
Asphalt Binder from Asphalt Mixtures
mixture. It provides equations for calculating the VMA based
D2726/D2726M Test Method for Bulk Specific Gravity and
on the asphalt content of the mix and its maximum specific
Density of Non-Absorptive Compacted Asphalt Mixtures
gravity (G ). It is intended that this should be used for the
mm
D6307 Test Method forAsphalt Content ofAsphalt Mixture
rapid “field” determination of VMA during quality control
by Ignition Method
(QC) operations at HMAplants, particularly where the specific
D6857/D6857M Test Method for Maximum Specific Grav-
gravity of the aggregate is highly variable.
ity and Density of Asphalt Mixtures Using Automatic
NOTE 1—VMA determined using the rapid field method is VMA that
Vacuum Sealing Method
has been corrected for aggregate absorption.
1.2 This standard does not purport to address all of the
3. Summary of Test Method
safety concerns, if any, associated with its use. It is the
3.1 The percent of (field)VMAin the mix can be calculated
responsibility of the user of this standard to establish appro-
by means of equations in which measured values for the
priate safety, health, and environmental practices and deter-
theoretical maximum specific gravity, the asphalt content, the
mine the applicability of regulatory limitations prior to use.
specific gravity of the asphalt, and the average bulk specific
1.3 This international standard was developed in accor-
gravity of the total aggregate and the compacted mix are
dance with internationally recognized principles on standard-
known.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Significance and Use
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 4.1 Various users desire indication of compliance with
VMA specifications for hot mix asphalt (HMA) during pro-
2. Referenced Documents
duction.
2
2.1 ASTM Standards:
4.2 The standard practice for determining VMA requires
C127 Test Method for Relative Density (Specific Gravity)
that the bulk specific gravity of the aggregate components be
and Absorption of Coarse Aggregate
determined. This is a very time-consuming test, which is not
C128 Test Method for Relative Density (Specific Gravity)
suitable for routine QC procedures.
and Absorption of Fine Aggregate
4.3 When an aggregate source used in the mix has a highly
D70/D70M Test Method for Specific Gravity and Density of
variable bulk specific gravity and a reference average bulk
Semi-Solid Asphalt Binder (Pycnometer Method)
specific gravity (G ) (for example, as established in the mix
D854 Test Methods for Specific Gravity of Soil Solids by sb
design) is used to calculate VMA during HMA production,
Water Pycnometer
erroneous values may occur.
1
This test method is under the jurisdiction of ASTM Committee D04 on Road
4.4 The test for maximum specific gravity of the mix (G )
mm
and Paving Materials and is the direct responsibility of Subcommittee D04.21 on
is a routine QC test at HMA plants. The effective specific
Specific Gravity and Density of Asphalt Mixtures.
gravity of the aggregate components (G ) can be easily
se
Current edition approved May 1, 2021. Published May 2021. Originally
calculated from this test. However the G does not take into
approved in 2005. Last previous edition approved in 2013 as D6995 – 05 (2013).
se
DOI: 10.1520/D6995-21.
account the amount of asphalt absorbed, which is required for
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
accurateVMAdetermination.Thismethodprovidesameansto
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
correct the G to account for the average absorbed asphalt.
Standards volume information, refer to the standard’s Document Summary page on se
the ASTM website. This procedure should not be used if the percent water
Copyright © ASTM International,
...
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: D6995 − 05 (Reapproved 2013) D6995 − 21
Standard Test Method for
Determining Field VMA basedBased on the Maximum
1
Specific Gravity of the Mix an Asphalt Mixture (G )
mm
This standard is issued under the fixed designation D6995; 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 test method is intended to be used for a rapid field determination of voids in mineral aggregate (VMA) of hot mix asphalt
(HMA).mixture. It provides equations for calculating the VMA based on the asphalt content of the mix and its maximum specific
gravity (G ). It is intended that this should be used for the rapid “field” determination of VMA during Quality Controlquality
mm
control (QC) operations at HMA plants, particularly where the specific gravity of the aggregate is highly variable.
NOTE 1—VMA determined using the rapid field method is VMA that has been corrected for aggregate absorption.
1.2 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.3 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:
C127 Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
D70D70/D70M Test Method for Specific Gravity and Density of Semi-Solid Asphalt Binder (Pycnometer Method)
D854 Test Methods for Specific Gravity of Soil Solids by Water Pycnometer
D2041D2041/D2041M Test Method for Theoretical Maximum Specific Gravity and Density of Asphalt Mixtures
D2172D2172/D2172M Test Methods for Quantitative Extraction of Asphalt Binder from Asphalt Mixtures
D2726D2726/D2726M Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Asphalt Mixtures
D6307 Test Method for Asphalt Content of Asphalt Mixture by Ignition Method
D6857/D6857M Test Method for Maximum Specific Gravity and Density of Asphalt Mixtures Using Automatic Vacuum Sealing
Method
3. Summary of Test Method
3.1 The percent of (field) VMA in the mix can be calculated by means of equations in which measured values for the theoretical
1
This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.21 on Specific
Gravity and Density of BituminousAsphalt Mixtures.
Current edition approved June 1, 2013May 1, 2021. Published September 2013May 2021. Originally approved in 2005. Last previous edition approved in 20052013 as
D6995 – 05.D6995 – 05 (2013). DOI: 10.1520/D6995-05R13.10.1520/D6995-21.
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
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D6995 − 21
maximum specific gravity, the asphalt content, the specific gravity of the asphalt, and the average bulk specific gravity of the total
aggregate and the compacted mix are known.
4. Significance and Use
4.1 Various users desire indication of compliance with VMA specifications for hot mix asphalt (HMA) during production.
4.2 The standard practice for determining VMA requires that the bulk specific gravity of the aggregate components be determined.
This is a very time consuming time-consuming test, which is not suitable for routine QC procedures.
4.3 When an aggregate source used in the mix has a highly variable bulk specific gravity and a reference average bulk specific
gravity (G ) (for example, as established in the mix design) is used to calculate VMA during HMA production, erroneous values
sb
may occur.
4.4 Th
...
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