ASTM_D_6931_-_12.pdf

Designation:D693112Standard Test Method forIndirect Tensile(IDT)Strength of Bituminous Mixtures1This standard is issued under the fixed designation D6931;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers procedures for preparing andtesting laboratory-fabricated or field-recovered cores of bitu-minous 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 testtemperature(25C),has been determined to be 80 kPa for101.6 mm diameter specimens,based on 28 labs using either 2or 4 test replicates with 11 different mix samples.Additionaldata is provided in Table for the users information.Thebetween-laboratory reproducibility of this test method is beingdetermined and will be available on or before August 2012.Therefore,this test method should not be used for acceptanceor rejection of materials for purchasing purposes.1.3 The values stated in SI units are to be regarded asstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1074 Test Method for Compressive Strength of Bitumi-nous MixturesD1561 Practice for Preparation of Bituminous Mixture TestSpecimens by Means of California Kneading CompactorD3387 Test Method for Compaction and Shear Properties ofBituminous Mixtures by Means of the U.S.Corps ofEngineers Gyratory Testing Machine(GTM)D3496 Practice for Preparation of Bituminous MixtureSpecimens for Dynamic Modulus Testing(Withdrawn2010)3D3549 Test Method for Thickness or Height of CompactedBituminous Paving Mixture SpecimensD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD4013 Practice for Preparation of Test Specimens of Bitu-minous Mixtures by Means of Gyratory Shear Compactor(Withdrawn 2013)3D4867/D4867M Test Method for Effect of Moisture onAsphalt Concrete Paving MixturesD5581 Test Method for Resistance to Plastic Flow of Bitu-minous Mixtures Using Marshall Apparatus(6 inch-Diameter Specimen)D6925 Test Method for Preparation and Determination ofthe Relative Density of Asphalt Mix Specimens by Meansof the Superpave Gyratory CompactorD6926 Practice for Preparation of Bituminous SpecimensUsing Marshall ApparatusD6927 Test Method for Marshall Stability and Flow ofAsphalt MixturesE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 AASHTO Standards:4AASHTO T245 Standard Method for Resistance to PlasticFlow of Bituminous Mixtures Using Marshall ApparatusAASHTO T312 Standard Method for Preparing and Deter-mining the Density of Hot Mix Asphalt(HMA)Speci-mens by Means of the Superpave Gyratory Compactor3.Summary of Test Method3.1 The IDT strength of bituminous mixtures is conductedby loading a cylindrical specimen across its vertical diametralplane at a specified rate of deformation and test temperature.The peak load at failure is recorded and used to calculate theIDT strength of the specimen.4.Significance and Use4.1 The values of IDT strength may be used to evaluate therelative quality of bituminous mixtures in conjunction with1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.26 onFundamental/Mechanistic Tests.Current edition approved Feb.1,2012.Published February 2012.Previousversion published in 2007 as D6931 12.DOI:10.1520/D6931-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American Association of State Highway and TransportationOfficials(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 States1 laboratory mix design testing and for estimating the potentialfor rutting or cracking.The results can also be used todetermine the potential for field pavement moisture damagewhen results are obtained on both moisture-conditioned andunconditioned specimens.5.Apparatus5.1 Loading DeviceLoading jack and ring dynamometeror a mechanical or servo-hydraulic testing machine with anelectronic load cell,in accordance with Test Method D6927,capable of applying a compressive load at a controlled defo