ASTM D8458-22
(Test Method)Standard Test Method for Evaluation of Fatigue Performance of Asphalt Mixtures Using the Three-Point Bending Cylinder (3PBC) Test
Standard Test Method for Evaluation of Fatigue Performance of Asphalt Mixtures Using the Three-Point Bending Cylinder (3PBC) Test
SIGNIFICANCE AND USE
5.1 This test method can be utilized to determine the fatigue resistance of asphalt mixtures. The test method is generally valid for specimens that are tested at intermediate temperatures. The three-point bending cylinder test samples are obtained by coring a 68 mm diameter cylinder from the center of a 150 mm diameter gyratory compacted sample, or horizontal coring from field cores or slabs cut from field sections. After coring, the sample is ready for testing and no further sample preparations steps are required. The two ends of the 68 mm diameter three-point bending cylinder sample do not need to be sliced.
5.2 The Timoshenko beam theory is used to calculate the reduction in dynamic modulus for each loading cycle. The test can be used to investigate the fatigue behavior of asphalt mixtures at various strain levels, temperatures, and frequencies. The results can be used to compare the fatigue life (Nf) for different asphalt mixtures. The Nf value can be calculated as the 50 % reduction in dynamic modulus. The Nf value is an indicator of fatigue performance of asphalt mixtures containing various mix design properties, asphalt binder types and modifications, gradations, and recycled materials. Typically, a higher Nf value indicates better fatigue performance. The Nf value may be used to identify crack-prone mixtures in performance-based mix design or in construction acceptance procedures, or both.
Note 1: The quality of the results produced by this test method 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 test method are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results may depend on many factors; following the suggestions of Specifi...
SCOPE
1.1 This test method provides a procedure to determine the fatigue life (number of cycles to failure, Nf) of asphalt mixtures, and also the reduction in dynamic modulus (|E*|) with loading cycles, using cylindrical samples subjected to three-point cyclic bending. The results obtained from this test can be used to calibrate Viscoelastic Continuum Damage (VECD) models to obtain a damage characteristic curve, which in turn can be used to obtain fatigue lives (Nf) at a variety of temperatures, strain levels, and frequencies (a separate standard practice is being drafted for this procedure). Even though this test method is intended primarily for displacement (strain) controlled fatigue testing, certain sections may provide useful information for force-controlled tests.
1.2 The test method describes the testing apparatus, instrumentation, specimen fabrication, and analysis procedures required to determine the number of cycles to failure of asphalt concrete.
1.3 The text of this test method 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 test method.
1.4 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
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 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 (T...
General Information
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: D8458 − 22
Standard Test Method for
Evaluation of Fatigue Performance of Asphalt Mixtures
1
Using the Three-Point Bending Cylinder (3PBC) Test
This standard is issued under the fixed designation D8458; 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
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1.1 This test method provides a procedure to determine the 2.1 ASTM Standards:
fatigue life (number of cycles to failure, N) of asphalt D8Terminology Relating to Materials for Roads and Pave-
f
mixtures, and also the reduction in dynamic modulus (|E*|) ments
with loading cycles, using cylindrical samples subjected to D979/D979MPractice for Sampling Asphalt Mixtures
three-point cyclic bending. The results obtained from this test D3549/D3549MTest Method for Thickness or Height of
can be used to calibrate Viscoelastic Continuum Damage Compacted Asphalt Mixture Specimens
(VECD)modelstoobtainadamagecharacteristiccurve,which D3666Specification for Minimum Requirements for Agen-
in turn can be used to obtain fatigue lives (N) at a variety of cies Testing and Inspecting Road and Paving Materials
f
temperatures, strain levels, and frequencies (a separate stan- D5361/D5361MPractice for Sampling Compacted Asphalt
dard practice is being drafted for this procedure). Even though Mixtures for Laboratory Testing
this test method is intended primarily for displacement (strain) D6373 Specification for Performance-Graded Asphalt
controlled fatigue testing, certain sections may provide useful Binder
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information for force-controlled tests.
2.2 AASHTO Standards:
R30Practice for Mixture Conditioning of Hot MixAsphalt
1.2 The test method describes the testing apparatus,
(HMA)
instrumentation,specimenfabrication,andanalysisprocedures
R83Preparation of Cylindrical Performance Test Speci-
requiredtodeterminethenumberofcyclestofailureofasphalt
mens Using the Superpave Gyratory Compactor (SGC)
concrete.
T 378Standard Method of Test for Determining the Dy-
1.3 The text of this test method references notes and
namic Modulus and Flow Number for Asphalt Mixtures
footnotes which provide explanatory material.These notes and
Using the Asphalt Mixture Performance Tester (AMPT)
footnotes (excluding those in tables and figures) shall not be
M 320Standard Specification for Performance-Graded As-
considered as requirements of the test method.
phalt Binder
1.4 Units—The values stated in SI units are to be regarded
M 332Standard Specification for Performance-Graded As-
as the standard. No other units of measurement are included in
phalt Binder Using Multiple Stress Creep Recovery
this standard.
(MSCR) Test
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety, health, and environmental practices and deter-
3.1.1 dynamic modulus, |E*|—theamplitudeofthecomplex
mine the applicability of regulatory limitations prior to use.
modulus that defines the relationship between the stress and
1.6 This international standard was developed in accor-
strain of viscoelastic materials. The |E*| is simply the peak-to-
dance with internationally recognized principles on standard-
peak stress divided by peak-to-peak strain in a cyclic test run
ization established in the Decision on Principles for the
at a constant frequency.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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
1
This test method is under the jurisdiction of ASTM Committee D04 on Road Standards volume information, refer to the standard’s Document Summary page on
and Paving Materials and is the direct responsibility of Subcommittee D04.26 on the ASTM website.
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Fundamental/Mechanistic Tests. Available from American Association of State Highway and Transportation
Current edition approved Dec. 15, 2022. Published January 2023. DOI: 10.1520/ Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
D8458-22. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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