ASTM_D_7115_-_10.pdf

Designation:D711510Standard 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 a hot mix asphaltspecimen.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 IEEE/ASTM SI 10,American National Standard forthe Use of International System of Units(SI):The ModernMetric System,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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD2726 Test Method for Bulk Specific Gravity and Densityof Non-Absorptive Compacted Bituminous MixturesD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD6752 Test Method for Bulk Specific Gravity and Densityof Compacted Bituminous Mixtures Using AutomaticVacuum Sealing MethodD6925 Test Method for Preparation and Determination ofthe Relative Density of Hot Mix Asphalt(HMA)Speci-mens by Means of the Superpave Gyratory CompactorE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodIEEE/ASTM SI 10 American National Standard for the Useof International System of Units(SI):The Modern MetricSystem3.Terminology3.1 Definitions:3.1.1 external anglethe angle formed between the exter-nal mold diameter and a stationary reference axis of themachine frame.3.1.2 internal anglethe angle formed between the internalmold diameter and a mold end plate as a mold is gyrated in anSGC.3.1.3 top internal anglethe angle formed between theinternal mold diameter and the upper mold end plate as a moldis gyrated in an SGC.3.1.4 bottom internal anglethe angle formed between theinternal mold diameter and the lower mold end plate as a moldis gyrated in an SGC.3.1.5 effective internal anglethe average of the top inter-nal angle and the bottom internal angle.3.1.6 tilting momenta force(F)acting at one end of anSGC mold platen in a direction parallel to the axis of gyration,but acting at some distance(e)away from that axis.The tiltingmoment at one end of the mold platen is computed as theproduct of this distance(e)and force(F).3.1.7 total momentthe sum total(M)of the tilting momentacting at the top of the mold and the tilting moment acting atthe bottom of the mold.3.1.8 eccentricitythe distance(e)away from the axis ofgyration at which a force(F)is acting at one end of an SGC1This 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 Bituminous Mixtures.Current edition approved June 1,2010.Published June 2010.Originallyapproved in 2005.Last previous edition approved in 2008 as D7115 08.DOI:10.1520/D7115-10.2For 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 States1 mold.This use of the term eccentricity is consistent withprevious published reports describing the mechanics of gyra-tory compaction.33.1.9 standard SGC volumetric specimena standard sizedhot mix asphalt specimen prepared using an SGC for purposesof volumetric mix design.Such a standard specimen,preparedin accordance with Test Method D6925,has a diameter of 150mm and a final compacted height of 115 6 5 mm.4.Summary of Test Method4.1 The internal angle of gyration of an SGC is measureddynamically with an instrument inserted into the SGC mold.4.2 A load(moment)is induced on the SGC whil