ASTM_D_7643_-_10.pdf

Designation:D764310Standard Practice forDetermining the Continuous Grading Temperatures andContinuous Grades for PG Graded Asphalt Binders1This standard is issued under the fixed designation D7643;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 practice is used to determine the continuous grad-ing temperatures and continuous grade for an asphalt bindergraded in accordance with the specification criteria specified inD6373,Standard Specification for Performance Graded As-phalt Binders.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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:2D8 Terminology Relating to Materials for Roads and Pave-mentsD2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt(Rolling Thin-Film Oven Test)D6373 Specification for Performance Graded AsphaltBinderD6521 Practice for Accelerated Aging of Asphalt BinderUsing a Pressurized Aging Vessel(PAV)D6648 Test Method for Determining the Flexural CreepStiffness of Asphalt Binder Using the Bending BeamRheometer(BBR)D6723 Test Method for Determining the Fracture Propertiesof Asphalt Binder in Direct Tension(DT)D6816 Practice for Determining Low-Temperature Perfor-mance Grade(PG)of Asphalt BindersD7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eter3.Terminology3.1 Definitions:Definitions for many terms common toasphalt cement and asphalt binder are found in TerminologyD8.3.2 Definitions of Terms Specific to This Standard:3.2.1 continuous grading temperatures,Tc,nthe high,intermediate,and low temperatures at which the specificationrequirements given in Tables 1 or 2 of Specification D6373 aremet.3.2.2 continuous grade,na grade defined by upper andlower continuous grading temperatures.3.2.3 PG grading temperatures,TPG,nthe temperatureslisted in Specification D6373 used to designate the grade of aPG binder,for example,64C,22C and-28C for a PG 64-28.3.2.4 test temperatures,T1and T2,ntwo PG gradingtemperatures,one grade apart and with T2 T1such that thetest properties at the two temperatures bracket the specificationrequirement for the property in question.3.2.5 specification requirements,nthe limiting valuesgiven in Specification D6373 that are used to grade an asphaltbinder,for example,1.00 kPa for G*/sin,300 MPa for S(60),etc.4.Summary of Practice4.1 The temperatures required to determine the continuousgrading temperatures and grade are obtained from test resultsobtained at the specification grading temperatures as listed inSpecification D6373 and,for each specification requirement,ata second temperature above or below the specification gradingtemperature.The continuous grading temperature is deter-mined by interpolating between the two test temperatures tocalculate the test temperature at which the specification re-quirement is met.The continuous grading temperatures arethen used to determine the continuous grade of the asphaltbinder.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.44 onRheological Tests.Current edition approved June 1,2010.Published March 2011.DOI:10.1520/D764310.2For 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 5.Significance and Use5.1 The continuous grading temperatures and continuousgrade are used for informational purposes only and are not usedfor the sale or purchase of asphalt binders.The continuousgrading temperatures and continuous grade may be used forforensic or research studies and when producing,blending,modifying,or otherwise evaluating asphalt binders.This guideis applicable to Specification D6373,Tables 1 and 2.6.Procedure6.1 Conduct testsFor each of the specification properties(for example,G*/sin,S(60),etc.)for which a TCis to becalculated determine the test results at two temperatures,T1and T2such that T2is greater than T1.The difference betweenT1and T2shall be 6C for the upper and lower test temperaturesand 3C for the intermediate temperature.The two tempera-tures shall provide test results that bracket the specificationrequirements.NOTE1For example,a PG 6