ASTM D6931-12
(Test Method)Standard Test Method for Indirect Tensile (IDT) Strength of Bituminous Mixtures
Standard Test Method for Indirect Tensile (IDT) Strength of Bituminous Mixtures
SIGNIFICANCE AND USE
The values of IDT strength may be used to evaluate the relative quality of bituminous mixtures in conjunction with laboratory mix design testing and for estimating the potential for rutting or cracking. The results can also be used to determine the potential for field pavement moisture damage when results are obtained on both moisture-conditioned and unconditioned specimens.
SCOPE
1.1 This test method covers procedures for preparing and testing laboratory-fabricated or field-recovered cores of bituminous mixtures to determine the Indirect Tensile (IDT) Strength.
1.2 The within-laboratory repeatability standard deviation, for the recommended rate of loading (50 mm/min) and test temperature (25ºC), has been determined to be 80 kPa for 101.6 mm diameter specimens, based on 28 labs using either 2 or 4 test replicates with 11 different mix samples. Additional data is provided in Table 1 for the user’s information. The between-laboratory reproducibility of this test method is being determined and will be available on or before August 2012. Therefore, this test method should not be used for acceptance or rejection of materials for purchasing purposes.
1.3 The values stated in SI units are to be regarded as standard.
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. Source of DataNumber
of
ReplicatesSpecimen
Diameter
(mm)Loading
Rate
(mm/min)Test
Temperature
(°C)Average
Strength
(kPa)Standard
Deviation
Strength
(kPa)d2s
(2.83×SE)
(kPa)Standard
Deviation
Strength
(% mean)d2s
(2.83×SE)
(% mean) Anderson and
McGennisA315012.5-1028702005667.019.8 N CHRP
Report 530B315012.5-10---922–32 (4 aggregate types;
4 binders)215012.5-10---11 (nom max size:
9.5 mm to 25 mm) Solaimanian and
KennedyCdry41005025-103292–– moisture-conditioned5025-83234–– (9 labs; 3 aggregate
types; 2 binders) Test Method D4867/D4867M
(dry or conditioned)21005025-55159–– (19 labs;
5 mixtures) Suggested Single
Lab Precision502580
A R. M. Anderson and R. B. McGennis, “Ruggedness Evaluation of AASHTO TP7 and TP9,” Phase I, FHWA HIPT (Task J), Federal Highway Administration, November 1998.
B W. Christensen and R. F. Bonaquist, “Evaluation of Indirect Tensile Test (IDT) Procedures for Low-Temperature Performance of Hot Mix Asphalt,” NCHRP Report 530.
C Solaimanian and T. W. Kennedy, “Precision of the Moisture Susceptibility Test Method TEX-531-C,” Project Summary Report 4909-S, November 2000.
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Designation: D6931 − 12
Standard Test Method for
1
Indirect Tensile (IDT) Strength of Bituminous Mixtures
This standard is issued under the fixed designation D6931; 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 Specimens for Dynamic Modulus Testing (Withdrawn
3
2010)
1.1 This test method covers procedures for preparing and
D3549 Test Method for Thickness or Height of Compacted
testing laboratory-fabricated or field-recovered cores of bitu-
Bituminous Paving Mixture Specimens
minous mixtures to determine the Indirect Tensile (IDT)
D3666 Specification for Minimum Requirements for Agen-
Strength.
cies Testing and Inspecting Road and Paving Materials
1.2 The within-laboratory repeatability standard deviation,
D4013 Practice for Preparation of Test Specimens of Bitu-
for the recommended rate of loading (50 mm/min) and test
minous Mixtures by Means of Gyratory Shear Compactor
temperature (25ºC), has been determined to be 80 kPa for 3
(Withdrawn 2013)
101.6 mm diameter specimens, based on 28 labs using either 2
D4867/D4867M Test Method for Effect of Moisture on
or 4 test replicates with 11 different mix samples. Additional
Asphalt Concrete Paving Mixtures
data is provided in Table for the user’s information. The
D5581 Test Method for Resistance to Plastic Flow of Bitu-
between-laboratory reproducibility of this test method is being
minous Mixtures Using Marshall Apparatus (6 inch-
determined and will be available on or before August 2012.
Diameter Specimen)
Therefore, this test method should not be used for acceptance
D6925 Test Method for Preparation and Determination of
or rejection of materials for purchasing purposes.
the Relative Density ofAsphalt Mix Specimens by Means
1.3 The values stated in SI units are to be regarded as of the Superpave Gyratory Compactor
D6926 Practice for Preparation of Bituminous Specimens
standard.
Using Marshall Apparatus
1.4 This standard does not purport to address all of the
D6927 Test Method for Marshall Stability and Flow of
safety concerns, if any, associated with its use. It is the
Asphalt Mixtures
responsibility of the user of this standard to establish appro-
E1 Specification for ASTM Liquid-in-Glass Thermometers
priate safety and health practices and determine the applica-
4
2.2 AASHTO Standards:
bility of regulatory limitations prior to use.
AASHTO T245 Standard Method for Resistance to Plastic
Flow of Bituminous Mixtures Using Marshall Apparatus
2. Referenced Documents
AASHTO T312 Standard Method for Preparing and Deter-
2
2.1 ASTM Standards:
mining the Density of Hot Mix Asphalt (HMA) Speci-
D1074 Test Method for Compressive Strength of Bitumi-
mens by Means of the Superpave Gyratory Compactor
nous Mixtures
D1561 Practice for Preparation of Bituminous Mixture Test 3. Summary of Test Method
Specimens by Means of California Kneading Compactor
3.1 The IDT strength of bituminous mixtures is conducted
D3387 Test Method for Compaction and Shear Properties of
by loading a cylindrical specimen across its vertical diametral
Bituminous Mixtures by Means of the U.S. Corps of
plane at a specified rate of deformation and test temperature.
Engineers Gyratory Testing Machine (GTM)
The peak load at failure is recorded and used to calculate the
D3496 Practice for Preparation of Bituminous Mixture
IDT strength of the specimen.
4. Significance and Use
1
4.1 The values of IDT strength may be used to evaluate the
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.26 on
relative quality of bituminous mixtures in conjunction with
Fundamental/Mechanistic Tests.
Current edition approved Feb. 1, 2012. Published February 2012. Previous
3
version published in 2007 as D6931– 12. DOI: 10.1520/D6931-12. The last approved version of this historical standard is referenced on
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or www.astm.org.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Association of State Highway and Transportation
Standards volume information, refer to the standard’s Document Summary page on Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
the ASTM website. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6931 − 12
Standard Standard
Number Specimen Loading Test Average d2s d2s
Deviation Deviation
Source of Data of Di
...
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:D6931–07 Designation: D6931 – 12
Standard Test Method for
1
Indirect Tensile (IDT) Strength of Bituminous Mixtures
This standard is issued under the fixed designation D6931; 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 test method covers procedures for preparing and testing laboratory-fabricated or field-recovered cores of bituminous
mixtures to determine the Indirect Tensile (IDT) Strength.
1.2 The within-laboratory repeatability standard deviation, for the recommended rate of loading (50 mm/min) and test
temperature(25ºC),hasbeendeterminedtobe80kPa(12psi)for100101.6mm(4in.)diameterspecimens,basedon28labsusing
either 2 or 4 test replicates with 11 different mix samples. Additional data is provided in Table 1 for the user’s information. The
between-laboratory reproducibility of this test method is being determined and will be available on or before August 2011.2012.
Therefore, this test method should not be used for acceptance or rejection of materials for purchasing purposes.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information 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:
D1074 Test Method for Compressive Strength of Bituminous Mixtures
D1561 Practice for Preparation of Bituminous Mixture Test Specimens by Means of California Kneading Compactor
D3387 Test Method for Compaction and Shear Properties of Bituminous Mixtures by Means of the U.S. Corps of Engineers
Gyratory Testing Machine (GTM)
D3496 Practice for Preparation of Bituminous Mixture Specimens for Dynamic Modulus Testing
D3549 Test Method for Thickness or Height of Compacted Bituminous Paving Mixture Specimens
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D4013 Practice for Preparation of Test Specimens of Bituminous Mixtures by Means of Gyratory Shear Compactor
D4867/D4867M Test Method for Effect of Moisture on Asphalt Concrete Paving Mixtures
D5581 Test Method for Resistance to Plastic Flow of Bituminous Mixtures Using Marshall Apparatus (6 inch-Diameter
Specimen)
D6925 Test Method for Preparation and Determination of the Relative Density of Hot Mix Asphalt (HMA) Specimens by
Means of the Superpave Gyratory Compactor
D6926 Practice for Preparation of Bituminous Specimens Using Marshall Apparatus
D6927 Test Method for Marshall Stability and Flow of Bituminous Mixtures
E1 Specification for ASTM Liquid-in-Glass Thermometers
3
2.2 AASHTO Standards:
AASHTO T245 Standard Method for Resistance to Plastic Flow of Bituminous Mixtures Using Marshall Apparatus
AASHTOT312 Standard Method for Preparing and Determining the Density of Hot MixAsphalt (HMA) Specimens by Means
of the Superpave Gyratory Compactor
3. Summary of Test Method
3.1 The IDT strength of bituminous mixtures is conducted by loading a cylindrical specimen across its vertical diametral plane
1
This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.26 on
Fundamental/Mechanistic Tests.
Current edition approved Feb. 1, 2007. Published February 2007. DOI: 10.1520/D6931-07.
Current edition approved Feb. 1, 2012. Published February 2012. Previous version published in 2007 as D6931–12. DOI: 10.1520/D6931-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6931 – 12
Standard Standard Standard
Number Specimen Loading Test Average d2s Test Average
...
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