ASTM D6521-03a

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Designation: D 6521 – 03a
Standard Practice for
Accelerated Aging of Asphalt Binder Using a Pressurized
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Aging Vessel (PAV)
This standard is issued under the fixed designation D 6521; 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 2. Referenced Documents
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1.1 This practice covers the accelerated aging (oxidation) of 2.1 ASTM Standards:
asphalt binders by means of pressurized air and elevated D 8 Terminology Relating to Materials for Roads and Pave-
temperature. This is intended to simulate the type of changes ments
which occur in asphalt binders during in-service oxidative D 1754 Test Method for Effect of Heat and Air on Asphalt
aging but may not accurately simulate the relative rates of Materials (Thin-Film Oven Test)
aging. It is intended for use with residue from Test Method D 2872 Test Method for Effect of Heat and Air on Rolling
D 2872 (RTFOT) which is designed to simulate plant aging. Film of Asphalt (Rolling Thin-Film Oven Test)
D 4753 Specification for Evaluating, Selecting and Speci-
NOTE 1—Modified asphalt binders may phase separate or form skins
fying Balances and Scales for Use in Soil, Rock and
during oven conditioning in Test Method D 2872 (RTFOT); the results
Construction Materials Testing
from subsequent testing of this residue may not be representative of
D 6373 Specification for Performance Graded Asphalt
modified asphalts short-term aged under field conditions. Phase separa-
tion, or formation of skins, or both can also occur during PAV aging.
Binder
Therefore, the practice may not be suitable for some modified asphalts.
E 220 Test Method for Calibration of Thermocouples by
NOTE 2—PAV has not been validated for materials containing particu-
Comparison Techniques
late materials.
E 1137 Specification for Industrial Platinum Resistance
1.2 The aging of asphalt binders during service is affected
Thermometers
by ambient temperature and air pressure and by mixture-
2.2 CGA Standards:
associated variables such as the volumetric proportions of the
CGA G-7.1–1997 Commodity Specification for Air, Fourth
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mix, the permeability of the mix, properties of the aggregates,
Edition
and possibly other factors. This conditioning process is in-
3. Terminology
tended to provide an evaluation of the relative resistance of
different asphalt binders to oxidative aging at selected elevated
3.1 Definitions:
aging temperatures and pressures but cannot account for
3.1.1 Definitions of terms used in this practice may be found
mixture variables or provide the relative resistance to aging at
in Terminology D 8 determined from common English usage,
in-service conditions.
or combinations of both.
1.3 The values stated in SI units are to be regarded as the
4. Summary of Practice
standard.
1.4 This standard does not purport to address all of the
4.1 Asphalt binder is first aged using Test Method D 2872
safety concerns, if any, associated with its use. It is the
(RTFOT). A specified thickness of residue from the RTFOT is
responsibility of the user of this standard to establish appro-
then placed in standard TFOT stainless steel pans and aged at
priate safety and health practices and determine the applica-
the specified aging temperature for 20 h in a vessel pressurized
bility of regulatory limitations prior to use.
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This practice is under the jurisdiction of ASTM Committee D04 on Road and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Paving Materials and is the direct responsibility of Subcommittee D04.46 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Durability and Distillation Test. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2003. Published January 2004. Originally the ASTM website.
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approved in 2000. Last previous edition approved in 2003 as D 6521–03. Available from CGA, Compressed Gas Association, Inc., Chantilly, VA 20151.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 6521 – 03a
with air to 2.10 MPa. Aging temperature is selected according at one condition of temperature and pressure, but age differ-
to the grade of this asphalt binder. The residue is then vacuum ently at another condition. Hence, the relative rates of aging for
degassed. a set of asphalts at PAV conditions may differ significantly
from the actual in-service relative rates at lower temperatures
5. Significance and Use
and pressures.
5.1 This method is designed to simulate the type of in
...