ASTM D6521-08
(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)
SIGNIFICANCE AND USE
This practice is designed to simulate the in-service oxidative aging that occurs in asphalt binders during pavement service. Residue from this conditioning practice may be used to estimate the physical or chemical properties of asphalt binders after several years of in-service aging in the field.
Binders conditioned using this practice are normally used to determine specification properties in accordance with Specification D 6373 or AASHTO M 320.
For asphalt binders of different grades or from different sources, there is no unique correlation between the time and temperature in this conditioning practice and in-service pavement age and temperature. Therefore, for a given set of in-service climatic conditions, it is not possible to select a single PAV conditioning time, temperature and pressure that will predict the properties or the relative rankings of the properties of asphalt binders after a specific set of in-service exposure conditions.
The relative degree of hardening of different asphalt binders varies with conditioning temperatures and pressures in the PAV. Therefore, two asphalt binders may age at a similar rate at one condition of temperature and pressure, but age differently at another condition. Hence, the relative rates of aging for a set of asphalts at PAV conditions may differ significantly from the actual in-service relative rates at lower pavement temperatures and ambient pressures.
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 changes in rheology which occur in asphalt binders during in-service oxidative aging but may not accurately simulate the relative rates of aging. It is normally 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 conditioning. Therefore, the practice may not be suitable for some modified asphalts.
Note 2—PAV conditioning has not been validated for materials containing particulate materials.
1.2 The aging of asphalt binders during service is affected by ambient temperature 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. Values in parentheses in inch-pound units are provided for informational purposes only.
1.4 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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Designation: D6521 − 08
StandardPractice for
Accelerated Aging of Asphalt Binder Using a Pressurized
1
Aging Vessel (PAV)
This standard is issued under the fixed designation D6521; 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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 Thispracticecoverstheacceleratedaging(oxidation)of
D8Terminology Relating to Materials for Roads and Pave-
asphalt binders by means of pressurized air and elevated
ments
temperature. This is intended to simulate the changes in
D2872Test Method for Effect of Heat andAir on a Moving
rheology which occur in asphalt binders during in-service
Film of Asphalt (Rolling Thin-Film Oven Test)
oxidative aging but may not accurately simulate the relative
D4753Guide for Evaluating, Selecting, and Specifying Bal-
ratesofaging.Itisnormallyintendedforusewithresiduefrom
ances and Standard Masses for Use in Soil, Rock, and
Test Method D2872 (RTFOT), which is designed to simulate
plant aging. Construction Materials Testing
D6373 Specification for Performance Graded Asphalt
NOTE 1—Modified asphalt binders may phase separate or form skins
Binder
during oven conditioning in Test Method D2872 (RTFOT); the results
E1137/E1137MSpecification for Industrial Platinum Resis-
from subsequent testing of this residue may not be representative of
modified asphalts short-term aged under field conditions. Phase tance Thermometers
3
separation, or formation of skins, or both can also occur during PAV
2.2 AASHTO Standards:
conditioning. Therefore, the practice may not be suitable for some
M 320 Specification for Performance-Graded Asphalt
modified asphalts.
Binder
NOTE 2—PAV conditioning has not been validated for materials
4
2.3 CGA Standards:
containing particulate materials.
CGA G-7.1–1997Commodity Specification for Air, Fourth
1.2 The aging of asphalt binders during service is affected
Edition
by ambient temperature and by mixture-associated variables,
suchasthevolumetricproportionsofthemix,thepermeability
3. Terminology
of the mix, properties of the aggregates, and possibly other
3.1 Definitions:
factors. This conditioning process is intended to provide an
3.1.1 Definitionsoftermsusedinthispracticemaybefound
evaluationoftherelativeresistanceofdifferentasphaltbinders
in Terminology D8, determined from common English usage,
to oxidative aging at selected elevated aging temperatures and
or combinations of both.
pressures, but cannot account for mixture variables or provide
the relative resistance to aging at in-service conditions.
4. Summary of Practice
1.3 The values stated in SI units are to be regarded as the
4.1 Asphalt binder is normally first conditioned using Test
standard. Values in parentheses in inch-pound units are pro-
Method D2872 (RTFOT). Residue from the RTFOT is then
vided for informational purposes only.
placedinstandardstainlesssteelpansandagedatthespecified
conditioning temperature for 20 h in a vessel pressurized with
1.4 This standard does not purport to address all of the
air to 2.10 MPa. The conditioning temperature is selected
safety concerns, if any, associated with its use. It is the
according to the grade of asphalt binder. The residue is then
responsibility of the user of this standard to establish appro-
vacuum degassed.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
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
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and the ASTM website.
3
Paving Materials and is the direct responsibility of Subcommittee D04.46 on Available from American Association of State Highway and Transportation
Durability and Distillation Tests. Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
Current edition approved Jan. 1, 2008. Published January 2008. Originally http://www.transportation.org.
4
approved in 2000. Last previous edition approved in 2005 as D6521–05. DOI: Available from Compressed Gas Association (CGA), 4221 Walney Rd., 5th
10.1520/D6521-08. Floor, Chantilly, VA 20151-2923, http://www.cganet.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6521 − 08
5. Significance and Use significantly from the actual in-service relative rates at lower
pavement temperatures and ambient pressures.
5.1
...
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:D6521–05 Designation:D6521–08
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
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 changeschanges in rheology which occur in asphalt binders during in-service
oxidative aging but may not accurately simulate the relative rates of aging. It is normally 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.conditioning. Therefore, the practice may not be suitable for some modified asphalts.
NOTE 2—PAV conditioning 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. Values in parentheses in inch-pound units are provided for
informational purposes only.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 8 Terminology Relating to Materials for Roads and Pavements D1754Test Method for Effect of Heat and Air on Asphaltic
Materials (Thin-Film Oven Test)
D 2872 Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
D 4753 Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction
Materials Testing
D 6373 Specification for Performance Graded Asphalt Binder
E 1137/E 1137M Specification for Industrial Platinum Resistance Thermometers
3
2.2 AASHTO Standards:
M 320Specification for Performance-Graded Asphalt Binder
MP1a Specification for Performance-Graded Asphalt Binder
4
2.3 CGA Standards:
CGA G-7.1–1997 Commodity Specification for Air, Fourth Edition
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.46 on Durability
and Distillation Tests.
Current edition approved July 15, 2005. Published August 2005. Originally approved in 2000. Last previous edition approved in 2004 as D 6521–04.
Current edition approved Jan. 1, 2008. Published January 2008. Originally approved in 2000. Last previous edition approved in 2005 as D 6521 – 05.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
3
Available from American Association of State Highway and Transportation Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org.
4
Available from Compressed Gas Association (CGA), 1725 Jefferson Davis Hwy., Suite 1004, Arlington, VA 22202-4102.
4
Available from Compressed Gas Association (CGA), 4221 Walney Rd., 5th Floor, Chantilly, VA 20151-2923, http://www.cganet.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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