ASTM_D_7173_-_14.pdf

Designation:D717314Standard 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 polymermodified 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 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 to determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D36 Test Method for Softening Point of Bitumen(Ring-and-Ball Apparatus)D7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eter3.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 5C.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)and DSR(Test Method D7175)are the most common testsused for this purpose.4.Significance and Use4.1 Purchasers of polymer modified asphalt need to be givenguidelines on proper storage and handling procedures tomaintain the integrity of material they have purchased.Thispractice provides a significant tool for understanding thecharacteristics of these materials as well as comparing varioussources of supply.5.Apparatus5.1 Aluminum Tubes25-mm diameter by 125-mm to140-mm length aluminum separation tubes,used to hold thetest sample during conditioning.35.2 BalanceCapable of being read to the nearest 0.1 g.5.3 OvenCapable of maintaining a temperature of 163 65C.5.4 FreezerCapable of maintaining a temperature of-106 10C.5.5 RackCapable of supporting the aluminum tubes in avertical position in the oven and freezer.5.6 ContainersMetal or glass,100 6 20-mL capacity.5.7 Hammer and Cutting ToolThe cutting tool must berigid and sharp to allow cutting of the tube containing thesample when at a low temperature.NOTE1A tool known as a 6-in-1 painters tool has been found idealfor this purpose.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 June 1,2014.Published July 2014.Originally approvedin 2005.Last previous edition approved in 2011 as D7173 11.DOI:10.1520/D7173-14.2For 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.3Aluminum tubes suitable for this purpose may be obtained from R/H Specialty&Machine,Inc.,P.O.Box 10187,Terre Haute,IN 47801,(812)232-0781,as PartNo.100-550;from HMA Lab Supply,3407 W.Leigh St.,Richmond VA 23230,(888)569-0499,as Part No.SC-4200;or from Freund Container,11535 S.CentralAve.,Alsip,IL,(800)363-9822 as Part No.6219T11.If you are aware of alternativesuppliers,please provide this information to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Procedure6.1 Place the empty aluminum tube in the rack,with sealedend down,or support it some other way in a vertical position.6.2 If the sample is not already hot,heat it in the oven at 1636 5C until sufficiently fluid to pour.Stir the sample thor-oughly and pour 50 6 0.5 g into the vertically held tube.Depending on the type of tube used,either fold the excess tubeover two times and crimp tightly,screw on the cap,insert acork stopper wrapped in aluminum foil,or seal it in some otherway to prevent the introduction of air.6.3 Place the sealed tube assembly in the 163 6 5C oven