ASTM_D_7313_-_13.pdf

Designation:D731313Standard Test Method forDetermining Fracture Energy of Asphalt-Aggregate MixturesUsing the Disk-Shaped Compact Tension Geometry1This standard is issued under the fixed designation D7313;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 the determination of fractureenergy(Gf)of asphalt-aggregate mixtures using the disk-shaped compact tension geometry.The disk-shaped compacttension geometry is a circular specimen with a single edgenotch loaded in tension.The fracture energy can be utilized asa parameter to describe the fracture resistance of asphaltconcrete.The fracture energy parameter is particularly usefulin the evaluation of mixtures with ductile binders,such aspolymer-modified asphalt concrete,and has been shown todiscriminate between these materials more broadly than theindirect tensile strength parameter(AASHTO T322,Wag-oner2).The test is generally valid at temperatures of 10C(50F)and below,or for material and temperature combina-tions which produce valid material fracture,as outlined in 7.4.1.2 The specimen geometry and terminology(disk-shapedcompact tension,DC(T)is modeled after Test Method E399for Plane-Strain Fracture Toughness of Metallic Materials,Appendix A6,with modifications to allow fracture testing ofasphalt concrete.1.3 The test method describes the testing apparatus,instrumentation,specimen fabrication,and analysis proceduresrequired to determine fracture energy of asphalt concrete andsimilar quasi-brittle materials.1.4 The text of this test method references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the test method.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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:3D8 Terminology Relating to Materials for Roads and Pave-mentsD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD6373 Specification for Performance Graded AsphaltBinderD6925 Test Method for Preparation and Determination ofthe Relative Density of Asphalt Mix Specimens by Meansof the Superpave Gyratory CompactorE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic MaterialsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1823 Terminology Relating to Fatigue and Fracture Testing2.2 AASHTO Standard:AASHTO T322 Standard Method of Test for Determiningthe Creep Compliance and Strength of Hot Mix Asphalt(HMA)Using the Indirect Tensile Test Device43.Terminology3.1 DefinitionsTerminologies E1823 and D8 are appli-cable to this test method.3.1.1 crack mouthportion of the notch that is on the flatsurface of the specimen,that is,opposite the notch tip(see Fig.3).1This 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 Dec.1,2013.Published January 2014.Originallyapproved in 2007.Last previous edition approved in 2007 as D7313 07a.DOI:10.1520/D7313-13.2Wagoner,M.P.,Buttlar,W.G.,Paulino,G.H.,and Blankenship,P.,“Labora-tory Testing Suite for Characterization ofAsphalt Concrete Mixtures Obtained fromField Cores,”Journal of the Association of Asphalt Paving Technologists,2006.3For 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.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 3.1.2 crack mouth opening displacement(CMOD)therelative displacement of the crack mouth.3.1.3 disk-shaped compact tension geometrya geometrythat utilizes a disk-shaped specimen with a single edge notch asdescribed in Test Method E399.3.1.4 2 fracture energy,Gfthe energy required to create aunit surface area of a crack.3.1.5 notch tipend of notch where the crack will initiateand propagate.4.Significance and Use4.1 The test method