ASTM_D_7115_-_20.pdf

Designation:D711520Standard Test Method forMeasurement of Superpave Gyratory Compactor(SGC)Internal Angle of Gyration Using Simulated Loading1This standard is issued under the fixed designation D7115;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 procedure for the measure-ment of the Superpave Gyratory Compactor(SGC)internalangle of gyration using an instrument capable of simulatingloading conditions similar to those created by an asphaltmixture specimen.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.The value given in rotations per minute is providedfor information regarding commonly used units.1.2.1 IEEE/ASTM SI 10,American National Standard forMetric Practice,offers guidance where use of decimal degreesfor plane angles(versus radians)and revolutions per minute forrate of gyration(versus radians per second)is acceptablewithin the IEEE/ASTM SI 10 system when used on a minimalbasis.1.3 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 standard1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD8 Terminology Relating to Materials for Roads and Pave-mentsD2726/D2726M Test Method for Bulk Specific Gravity andDensity of Non-Absorptive Compacted Asphalt MixturesD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD6752/D6752M Test Method for Bulk Specific Gravity andDensity of Compacted Asphalt Mixtures Using AutomaticVacuum Sealing MethodD6925 Test Method for Preparation and Determination ofthe Relative Density of Asphalt Mix Specimens by Meansof the Superpave Gyratory CompactorE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodIEEE/ASTM SI 10 American National Standard for MetricPractice3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D8.3.2 Definitions of Terms Specific to This Standard:3.2.1 bottom internal angle,nthe angle formed betweenthe internal mold diameter and the lower mold end plate as amold is gyrated in an SGC.3.2.2 eccentricity,e,nthe distance away from the axis ofgyration at which a force(F)is acting at one end of an SGCmold.3.2.2.1 DiscussionThis use of the term eccentricity is1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.20 onMechanical Tests of Asphalt Mixtures.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 2005.Last previous edition approved in 2015 as D7115 10(2015).DOI:10.1520/D7115-20.2For 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.consistent with previous published reports describing themechanics of gyratory compaction.33.2.3 effective internal angle,nthe average of the topinternal angle and the bottom internal angle.3.2.4 external angle,nthe angle formed between theexternal mold diameter and a stationary reference axis of themachine frame as a mold is gyrated in the SGC.3.2.5 internal angle,nthe angle formed between theinternal mold diameter and a mold end plate as a mold isgyrated in an SGC.3.2.6 standard SGC volumetric specimen,na standardsized asphalt mixture specimen prepared using an SGC forpurposes of volume