ASTM_D_8303_-_20.pdf

Designation:D830320Standard Test Method forDetermining Thermal Cracking Properties of AsphaltMixtures Through Measurement of Thermally InducedStress and Strain1This standard is issued under the fixed designation D8303;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 method of test is used to determine the thermalviscoelastic and thermal volumetric properties of field-cored orlaboratory-compacted asphalt mixture specimens by measuringthe thermally induced stress and strain while being cooled at aconstant rate from an initial equilibrium temperature.Thethermal stress and strain shall be measured using the uniaxialthermal stress and strain tester(UTSST).1.2 This standard test method covers procedures for prepar-ing and testing asphalt mixtures to measure thermal stress andstrain and directly calculate:(1)the coefficient of axial thermalcontraction,and(2)the modulus of asphalt mixture over arange of temperatures.1.3 The procedure described in this standard provides re-quired information for estimation of thermal cracking suscep-tibility of asphalt mixtures.The procedure applies to testspecimens having a maximum aggregate size of 19 mm or less.1.4 This standard can be used for conventional and noncon-ventional asphalt mixtures including but not limited to:hotasphalt mixtures,asphalt mixture with recycled materials,coldasphalt mixtures,warm asphalt mixtures,and neat or modifiedasphalt mixtures(for example,polymer or rubber-modified).1.5 This standard can be used to determine the following:1.5.1 Thermal stress buildup in asphalt mixture during asingle cooling event.1.5.2 Thermal strain in asphalt mixtures as a function oftemperature.1.5.3 Coefficient of axial thermal contraction.1.5.4 Modulus of asphalt mixture as a function of tempera-ture.1.5.5 Thermal viscoelastic properties of asphalt mixture:viscous softening,viscous-glassy transition,glassy hardening,crack initiation,fracture temperature,and fracture stress.1.5.6 UTSST cracking resistance index(CRI).1.5.7 UTSST CRI adjusted for environmental condition(CRIEnv).1.6 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.7 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.8 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A36/A36M Specification for Carbon Structural SteelD8 Terminology Relating to Materials for Roads and Pave-mentsD979/D979M Practice for Sampling Bituminous PavingMixturesD2041/D2041M Test Method for Theoretical MaximumSpecific Gravity and Density of Asphalt MixturesD2726/D2726M Test Method for Bulk Specific Gravity andDensity of Non-Absorptive Compacted Asphalt MixturesD3203/D3203M Test Method for Percent Air Voids in Com-pacted Asphalt MixturesD3549/D3549M Test Method for Thickness or Height of1This 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 July 1,2020.Published July 2020.DOI:10.1520/D8303-20.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.Compacted Asphalt Mixture SpecimensD3665 Practice for Random Sampling of Construction Ma-terialsD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD5361/D5361M Practice for Sampling Compacted AsphaltMixtures for Laboratory Te