ASTM_D_7173_-_20.pdf

Designation:D717320Standard Practice forDetermining the Separation Tendency of Polymer fromPolymer-Modified Asphalt1This standard is issued under the fixed designation D7173;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 describes a laboratory procedure for de-termining the tendency of polymer to separate from polymer-modified asphalt under static heated storage conditions.Theresults of testing on material prepared according to this practicemay be used as a guideline when formulating products or toestablish field handling procedures.Large differences in testresults between top and bottom specimens indicate that there isa degree of incompatibility between the polymer and the baseasphalt.1.2 The values stated in SI units are to be regarded as thestandard.No other units of measurement are included in thisstandard.1.3 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.1.4 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:2D36/D36M Test Method for Softening Point of Bitumen(Ring-and-Ball Apparatus)D3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eterD7405 Test Method for Multiple Stress Creep and Recovery(MSCR)of Asphalt Binder Using a Dynamic ShearRheometer3.Summary of Practice3.1 A measured quantity of polymer-modified asphalt in asealed aluminum tube is conditioned in a vertical position for48 h at a temperature of 163 6 5 C.At the end of theconditioning period,top and bottom portions are separated andsubjected to further testing to determine the degree of separa-tion.Tests chosen for this purpose depend on the polymermodification system being evaluated and the type of informa-tion desired by the user.Softening point(Test Method D36/D36M)and DSR(Test Method D7175)are the most commontests used for this purpose.MSCR(Test Method D7405)is analternate test.4.Significance and Use4.1 Purchasers of polymer-modified asphalt need guidelineson proper storage and handling procedures to maintain theintegrity of material they have purchased.This practice pro-vides a significant tool for understanding the characteristics ofthese materials as well as comparing various sources of supply.NOTE1The quality of the results produced by this standard aredependent on the competence of the personnel performing the procedureand the capability,calibration,and maintenance of the equipment used.Agencies that meet the criteria of Specification D3666 are generallyconsidered capable of competent and objective testing,sampling,inspection,etc.Users of this standard are cautioned that compliance withSpecification D3666 alone does not completely ensure reliable results.Reliable results depend on many factors;following the suggestions ofSpecification D3666 or some similar acceptable guideline provides ameans of evaluating and controlling some of those factors.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.47 onMiscellaneous Asphalt Tests.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 2005.Last previous edition approved in 2014 as D7173 14.DOI:10.1520/D7173-20.2For 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.5.Apparatus5.1 Aluminum Tubes25 mm diameter