ASTM D6521-00
(Practice)Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
SCOPE
1.1 This practice covers the accelerated aging (oxidation) of asphalt binders by means of pressurized air and elevated temperature. This is intended to simulate the type of changes which occur in asphalt binders during in-service oxidative aging but may not accurately simulate the relative rates of aging. It is intended for use with residue from Test Method D 2872 (RTFOT) which is designed to simulate plant aging.Note 1
Modified asphalt binders may phase separate or form skins during oven conditioning in Test Method D 2872 (RTFOT); the results from subsequent testing of this residue may not be representative of modified asphalts short-term aged under field conditions. Phase separation, or formation of skins, or both can also occur during PAV aging. Therefore, the practice may not be suitable for some modified asphalts.Note 2
PAV has not been validated for materials containing particulate materials.
1.2 The aging of asphalt binders during service is affected by ambient temperature and air pressure and by mixture-associated variables such as the volumetric proportions of the mix, the permeability of the mix, properties of the aggregates, and possibly other factors. This conditioning process is intended to provide an evaluation of the relative resistance of different asphalt binders to oxidative aging at selected elevated aging temperatures and pressures but cannot account for mixture variables or provide the relative resistance to aging at in-service conditions.
1.3 The values stated in SI units are to be regarded as the standard.
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation:D6521–00
Standard Practice for
Accelerated Aging of Asphalt Binder Using a Pressurized
1
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 D 8 Terminology Relating to Materials for Roads and Pave-
2
ments
1.1 This practice covers the accelerated aging (oxidation) of
D 1754 Test Method for Effect of Heat and Air on Asphalt
asphalt binders by means of pressurized air and elevated
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Materials (Thin-Film Oven Test)
temperature. This is intended to simulate the type of changes
D 2872 Test Method for Effect of Heat and Air on Rolling
which occur in asphalt binders during in-service oxidative
2
Film of Asphalt (Rolling Thin-Film Oven Test)
aging but may not accurately simulate the relative rates of
D 4753 Specification for Evaluating, Selecting and Speci-
aging. It is intended for use with residue from Test Method
fying Balances and Scales for Use in Soil, Rock and
D 2872 (RTFOT) which is designed to simulate plant aging.
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Construction Materials Testing
NOTE 1—Modified asphalt binders may phase separate or form skins
E 220 Test Method for Calibration of Thermocouples by
during oven conditioning in Test Method D 2872 (RTFOT); the results
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Comparison Techniques
from subsequent testing of this residue may not be representative of
E 1137 Specification for Industrial Platinum Resistance
modified asphalts short-term aged under field conditions. Phase separa-
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Thermometers
tion, or formation of skins, or both can also occur during PAV aging.
2.2 AASHTO Standards:
Therefore, the practice may not be suitable for some modified asphalts.
NOTE 2—PAV has not been validated for materials containing particu-
MP1 Provisional Standard Specification for Performance-
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late materials.
Graded Asphalt Binder
1.2 The aging of asphalt binders during service is affected
3. Terminology
by ambient temperature and air pressure and by mixture-
3.1 Definitions:
associated variables such as the volumetric proportions of the
3.1.1 Definitionsoftermsusedinthispracticemaybefound
mix, the permeability of the mix, properties of the aggregates,
in Terminology D 8 determined from common English usage,
and possibly other factors. This conditioning process is in-
or combinations of both.
tended to provide an evaluation of the relative resistance of
different asphalt binders to oxidative aging at selected elevated
4. Summary of Practice
aging temperatures and pressures but cannot account for
4.1 Asphalt binder is first aged using Test Method D 2872
mixture variables or provide the relative resistance to aging at
(RTFOT). A specified thickness of residue from the RTFOT is
in-service conditions.
then placed in standard TFOT stainless steel pans and aged at
1.3 The values stated in SI units are to be regarded as the
the specified aging temperature for 20 h in a vessel pressurized
standard.
with air to 2.10 MPa. Aging temperature is selected according
1.4 This standard does not purport to address all of the
to the grade of this asphalt binder. The residue is then vacuum
safety concerns, if any, associated with its use. It is the
degassed.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This method is designed to simulate the type of in-
2. Referenced Documents
service oxidative aging that occurs in asphalt binders during
2.1 ASTM Standards:
2
Annual Book of ASTM Standards, Vol 04.03.
1 3
This practice is under the jurisdiction of ASTM Committee D04 on Road and Annual Book of ASTM Standards, Vol 04.08.
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Paving Materials and is the direct responsibility of Subcommittee D04.46 on Annual Book of ASTM Standards, Vol 14.03.
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Durability and Distillation Test. Available fromAASHTO, National Institute of Std. &Tech., Gaithersburg, MD
Current edition approved Jan. 10, 2000. Published April 2000. 20899.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
D6521
pavement service. Residue from this conditioning practice may a set of asphalts at PAV conditions may differ significantly
be used to estimate the physical or chemical properties of from the actual in-service relative rates at lower temperatures
asphalt binders after several years
...
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