ASTM_D_7496_-_18.pdf

Designation:D749618Standard Test Method forViscosity of Emulsified Asphalt by Saybolt FurolViscometer1This standard is issued under the fixed designation D7496;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 utilizes the Saybolt Furol viscometer tomeasure the consistency of emulsified asphalt.It is applicableto all the emulsified asphalts specified in Specifications D977and D2397/D2397M.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in noncompliance withthe standard.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:2D88 Test Method for Saybolt ViscosityD977 Specification for Emulsified AsphaltD2397/D2397M Specification for Cationic Emulsified As-phaltE1 Specification for ASTM Liquid-in-Glass ThermometersE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers3.Significance and Use3.1 Viscosity has significance in the use of emulsifiedasphalts because it is a property which affects their utility.When used in application types of construction,the materialmust be thin enough to be uniformly applied through the spraybar of distributor,yet thick enough so that it will not flow fromthe crown or grade of the road.For mixing-grade emulsions,the viscosity may affect mixability and resulting thickness offilm on the aggregate.The viscosity of many emulsifiedasphalts is affected by shear.Therefore,strict adherence to testprocedure is necessary to achieve precision.4.Sample Conditioning for Testing4.1 All emulsified asphalts shall be properly stirred toachieve homogeneity before testing.4.2 All emulsified asphalts with the viscosity testing re-quirements of 50 C 122 F shall be heated to 50 6 3 C 1226 5 F in the original sample container in a water bath oroven.The container should be vented to relieve pressure.Afterthe sample reaches 50 6 3 C 122 6 5 F,stir the sample toachieve homogeneity.4.3 Emulsified asphalts with viscosity testing requirementsto 25 C 77 F should be mixed or stirred at 25 6 3 C 77 65 F in the original sample container to achieve homogeneity.NOTE1Emulsified asphalts with viscosity testing requirements of25 C 77 F may be heated and stirred as specified in 4.2,if necessary.In the event the method described in 4.2 is used,the sample should becooled to 25 6 3 C 77 6 5 F and stirred before testing.5.Apparatus5.1 ViscometerA Saybolt Furol viscometer conforming tothe requirements specified in Test Method D88.5.2 SieveAn 850-m sieve or a 20-mesh strainer of wirecloth,framed or unframed.Refer to Specification E11.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved Dec.1,2018.Published January 2019.Originallyapproved in 2009.Last previous edition approved in 2017 as D7496 17.DOI:10.1520/D7496-18.2For 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 5.3 ThermometersOne of the following:5.3.1 ASTM No.17C or 17F for tests at 25 C 77 F andASTM No.19C or 19F for tests at 50 C 122 F,conformingto the req