ASTM_D_7643_-_16.pdf

Designation:D764316Standard 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 estimate the continuous gradingtemperatures and continuous grade for an asphalt binder gradedin accordance with the requirements specified in SpecificationD6373.1.2 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 grade,na grade defined by the estimatedupper and lower continuous grading temperatures.3.2.2 continuous grading temperatures,Tc,nthe estimatedtemperatures at which the properties of an asphalt binder areequal to the specification requirements given in Tables 1 or 2 ofSpecification D6373.3.2.3 difference between estimated continuous grading tem-perature for S and the m-value,TCdetermined by subtract-ing the continuous grading temperature for the m-value fromthe continuous grading temperature for S.3.2.4 PG grading temperatures,TPG,nthe temperatureslisted in Specification D6373 used to designate the grade of aPG binder,for example,64 C,22 C,and 28 C for a PG64-28.3.2.5 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,etc.3.2.6 test temperatures,T1and T2,ntwo PG gradingtemperatures,one grade apart such that the measured proper-ties at the two temperatures bracket the specification require-ment for the property in question.4.Summary of Practice4.1 The continuous grading temperature for each specifica-tion requirement is determined by interpolating between testresults obtained at two adjacent specification temperatures.Thetwo temperatures are chosen so that the test result at onetemperature is greater than the specification requirement andthe test result at the other temperature is less than thespecification requirement.The upper continuous grade isdetermined as the lower of the two continuous grading tem-peratures determined for the original and RTFOT condition1This 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 Dec.1,2016.Published January 2017.Originallyapproved in 2010.Last previous edition approved in 2010 as D7643 10.DOI:10.1520/D7643-16.2For 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.1(Test Methods D2872 and D7175).The intermediate continu-ous grade is equal to the intermediate continuous gradingtemperature(Practice D6521,Test Method D7175).The lowercontinuous grade is determined as the higher of the continuousgrading temperatures for S and the m-value(Practice D6521,Test Method D6648).5.Significance and Use5.1 The continuous grading temperatures and cont