ASTM D8360-22
(Test Method)Standard Test Method for Determination of Rutting Tolerance Index of Asphalt Mixture Using the Ideal Rutting Test
Standard Test Method for Determination of Rutting Tolerance Index of Asphalt Mixture Using the Ideal Rutting Test
SIGNIFICANCE AND USE
5.1 The ideal rutting test (IRT) is used to determine asphalt mixture rutting resistance at high temperature in the range of 50 ± 15 °C, depending on local climate. The specimens are readily obtained from Superpave Gyratory Compactor (SGC) compacted cylinders with a diameter of 150 ± 2 mm, with no cutting, gluing, drilling, or instrumentation required. Similarly, field cores with a diameter of 150 ± 2 mm can be tested to measure rutting resistance of in-place asphalt mixtures.
Note 1: Field cores may need cutting to a right thickness ranging from 38 mm to 95 mm. This test standard is not applicable to the specimens with a diameter other than 150 ± 2 mm, regardless of laboratory-compacted specimens or field cores.
5.2 The RTIndex of an asphalt mixture is calculated from the peak load (or shear strength). The RTIndex is a performance indicator of the rutting resistance of asphalt mixtures containing various asphalt binders, asphalt binder modifiers and additives, aggregate blends, fibers, and recycled materials. Generally, the higher the RTIndex value, the better the rutting resistance and consequently the smaller the rut depth in the field. Users can employ the RTIndex and associated criteria to identify rutting-prone mixtures during mix design and production quality control/assurance.
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.
SCOPE
1.1 This test method covers the procedures for preparing, testing, and measuring asphalt mixture rutting resistance at high temperatures using cylindrical laboratory-prepared asphalt mix samples or pavement cores. The test method describes the determination of the rutting tolerance index, RTIndex, and other parameters determined from the load-displacement curve. These parameters can be used to evaluate the resistance of asphalt mixtures to rutting.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
1.4 The within-laboratory repeatability standard deviation of rutting tolerance index has been determined to be 2.42, based on two labs, 30 test replicates, and ten different samples. The between-laboratory reproducibility of this test method is being determined and will be available on or before December 31, 2026. Therefore, this standard should not be used for acceptance or rejection of a material for purchasing purpose.
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 (TBT) Committee.
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: D8360 − 22
Standard Test Method for
Determination of Rutting Tolerance Index of Asphalt Mixture
1
Using the Ideal Rutting Test
This standard is issued under the fixed designation D8360; 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 This test method covers the procedures for preparing,
D8Terminology Relating to Materials for Roads and Pave-
testing, and measuring asphalt mixture rutting resistance at
ments
high temperatures using cylindrical laboratory-prepared as-
D979/D979MPractice for Sampling Bituminous Paving
phalt mix samples or pavement cores. The test method de-
Mixtures
scribes the determination of the rutting tolerance index,
D3203/D3203MTest Method for PercentAirVoids in Com-
RT , and other parameters determined from the load-
Index
pacted Asphalt Mixtures
displacement curve. These parameters can be used to evaluate
D3666Specification for Minimum Requirements for Agen-
the resistance of asphalt mixtures to rutting.
cies Testing and Inspecting Road and Paving Materials
1.2 The values stated in SI units are to be regarded as
D6925Test Method for Preparation and Determination of
standard. No other units of measurement are included in this
theRelativeDensityofAsphaltMixSpecimensbyMeans
standard.
of the Superpave Gyratory Compactor
D6926Practice for Preparation of Asphalt Mixture Speci-
1.3 The text of this standard references notes and footnotes
whichprovideexplanatorymaterial.Thesenotesandfootnotes mens Using Marshall Apparatus
D6927Test Method for Marshall Stability and Flow of
(excluding those in tables and figures) shall not be considered
as requirements of the standard. Asphalt Mixtures
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2.2 AASHTO Standards:
1.4 The within-laboratory repeatability standard deviation
R30Practice for Mixture Conditioning of Hot MixAsphalt
of rutting tolerance index has been determined to be 2.42,
(HMA)
basedontwolabs,30testreplicates,andtendifferentsamples.
T 324Standard Method of Test for Hamburg Wheel-Track
The between-laboratory reproducibility of this test method is
Testing of Compacted Asphalt Mixtures
being determined and will be available on or before December
T 340Standard Method of Test for Determining Rutting
31, 2026. Therefore, this standard should not be used for
Susceptibility of Hot Mix Asphalt (HMA) Using the
acceptance or rejection of a material for purchasing purpose.
Asphalt Pavement Analyzer (APA)
1.5 This standard does not purport to address all of the
T 378Standard Method of Test for Determining the Dy-
safety concerns, if any, associated with its use. It is the
namic Modulus and Flow Number for Asphalt Mixtures
responsibility of the user of this standard to establish appro-
Using the Asphalt Mixture Performance Tester (AMPT)
priate safety, health, and environmental practices and deter-
TP 116Standard Method of Test for Rutting Resistance of
mine the applicability of regulatory limitations prior to use.
Asphalt Mixtures Using Incremental Repeated Load Per-
1.6 This international standard was developed in accor- manent Deformation (iRLPD)
dance with internationally recognized principles on standard-
3. Terminology
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.1 Definitions—For definitions of terms used in this
mendations issued by the World Trade Organization Technical
standard, refer to Terminology D8.
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.
3
Fundamental/Mechanistic Tests. Available from American Association of State Highway and Transportation
Current edition approved Oct. 1, 2022. Published October 2022. DOI: 10.1520/ Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
D8360-22. 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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D8360 − 22
3.2 Definitions of Terms Specific to This Standard: 6. Apparatus
3.2.1 RT ,n—rutting tol
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