ASTM D6521-18
(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
5.1 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.
5.2 Binders conditioned using this practice are normally used to determine specification properties in accordance with Specification D6373 or AASHTO M 320.
5.3 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.
5.4 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 conditioning of asphalt binders to simulate accelerated aging (oxidation) 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 D2872 (RTFOT), which is designed to simulate plant aging.
Note 1: 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 standard. No other units of measurement are included in this standard.
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
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 ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.
1.5 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.
1.6 This international standard was developed in...
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Designation: D6521 − 18
Standard Practice 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.
means of evaluating and controlling some of those factors.
1. Scope
1.5 This standard does not purport to address all of the
1.1 This practice covers the conditioning of asphalt binders
safety concerns, if any, associated with its use. It is the
to simulate accelerated aging (oxidation) by means of pressur-
responsibility of the user of this standard to establish appro-
ized air and elevated temperature. This is intended to simulate
priate safety, health, and environmental practices and deter-
the changes in rheology which occur in asphalt binders during
mine the applicability of regulatory limitations prior to use.
in-service oxidative aging, but may not accurately simulate the
1.6 This international standard was developed in accor-
relative rates of aging. It is normally intended for use with
dance with internationally recognized principles on standard-
residue from Test Method D2872 (RTFOT), which is designed
ization established in the Decision on Principles for the
to simulate plant aging.
Development of International Standards, Guides and Recom-
NOTE 1—PAV conditioning has not been validated for materials
mendations issued by the World Trade Organization Technical
containing particulate materials.
Barriers to Trade (TBT) Committee.
1.2 The aging of asphalt binders during service is affected
2. Referenced Documents
by ambient temperature and by mixture-associated variables,
2
suchasthevolumetricproportionsofthemix,thepermeability
2.1 ASTM Standards:
of the mix, properties of the aggregates, and possibly other
D8Terminology Relating to Materials for Roads and Pave-
factors. This conditioning process is intended to provide an
ments
evaluationoftherelativeresistanceofdifferentasphaltbinders
D2872Test Method for Effect of Heat andAir on a Moving
to oxidative aging at selected elevated aging temperatures and
Film of Asphalt (Rolling Thin-Film Oven Test)
pressures, but cannot account for mixture variables or provide
D3666Specification for Minimum Requirements for Agen-
the relative resistance to aging at in-service conditions.
cies Testing and Inspecting Road and Paving Materials
1.3 The values stated in SI units are to be regarded as D4753Guide for Evaluating, Selecting, and Specifying Bal-
ances and Standard Masses for Use in Soil, Rock, and
standard. No other units of measurement are included in this
standard. Construction Materials Testing
D6373 Specification for Performance Graded Asphalt
1.4 The text of this standard references notes and footnotes
Binder
which provide explanatory material.These notes and footnotes
E1137/E1137MSpecification for Industrial Platinum Resis-
(excluding those in tables and figures) shall not be considered
tance Thermometers
as requirements of the standard
3
2.2 AASHTO Standard:
NOTE 2—The quality of the results produced by this standard are
M 320 Specification for Performance-Graded Asphalt
dependent on the competence of the personnel performing the procedure
Binder
and the capability, calibration, and maintenance of the equipment used.
4
2.3 CGA Standard:
Agencies that meet the criteria of Specification D3666 are generally
CGA G-7.1–1997Commodity Specification for Air, Fourth
considered capable of competent and objective testing, sampling,
inspection, etc. Users of this standard are cautioned that compliance with
Edition
Specification D3666 alone does not completely ensure reliable results.
Reliable results depend on many factors; following the suggestions of
2
Specification D3666 or some similar acceptable guideline provides a 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,
CurrenteditionapprovedJuly1,2018.PublishedJuly2018.Originallyapproved http://www.transportation.org.
4
in 2000. Last previous edition approved in 2013 as D6521–13. DOI: 10.1520/ Available from Compressed Gas Association (CGA), 4221 Walney Rd., 5th
D6521-18.
...
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 − 13 D6521 − 18
Standard Practice 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. 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 practice covers the accelerated aging (oxidation) conditioning of asphalt binders to simulate accelerated aging
(oxidation) 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 D2872 (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 D2872 (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 1—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.standard. No other units of measurement are included in this standard.
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
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 ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar
acceptable guideline provides a means of evaluating and controlling some of those factors.
1.5 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.
1.6 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:
D8 Terminology Relating to Materials for Roads and Pavements
D2872 Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
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 Sept. 1, 2013July 1, 2018. Published September 2013July 2018. Originally approved in 2000. Last previous edition approved in 20082013 as
D6521 – 08.D6521 – 13. DOI: 10.1520/D6521-13.10.1520/D6521-18.
2
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