ASTM_D_7226_-_13_2017.pdf

Designation:D722613(Reapproved 2017)Standard Test Method forDetermining the Viscosity of Emulsified Asphalts Using aRotational Paddle Viscometer1This standard is issued under the fixed designation D7226;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 rotational paddle viscom-eter to measure the viscosity of emulsified asphalt.It isapplicable to all the emulsified asphalts described in Specifi-cations D977 and D2397.1.2 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D140 Practice for Sampling Bituminous MaterialsD977 Specification for Emulsified AsphaltD2397 Specification for Cationic Emulsified AsphaltE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 viscosity,nratio of shear stress to shear rate.3.1.1.1 DiscussionThe SI unit of viscosity is the Pascalsecond(Pas).34.Summary of Test Method4.1 The rotational paddle viscometer method is used tomeasure the apparent viscosity of emulsified asphalt at 50 C,25 C,or other agreed-upon temperatures.A microprocessorcircuitry system functioning in tandem with a temperatureprobe and equipped with internal electronic sensors detects andanalyzes the preset temperature.A paddle is immersed in theemulsified asphalt sample and is rotated at 100 r/min.Theapparent viscosity of the sample is obtained and read from theelectronic display or an optional printer.5.Significance and Use5.1 The viscosity of emulsified asphalts characterizes theirflow properties and affects their utility at 50 C or at othertemperatures.The sprayability and workability of an emulsi-fied asphalt are directly related to its viscosity for manyapplications.The material must be thin enough to be sprayedyet thick enough such that it will not flow from the crown orgrade of the road.For mixing-grade emulsified asphalts,theviscosity will affect its workability and resulting film thicknesson the aggregate.This test method is useful to measure theapparent viscosity of emulsified asphalt at a temperature of50 C,25 C,or another agreed-upon temperature.The presettemperature and rotational speed at 100 r/min allow for anautomated and consistent determination of an emulsified as-phalt viscosity within a short time.6.Apparatus6.1 The rotational paddle viscometer test system consists ofa paddle,temperature probe,sample cup,the sample cup cover,a means of controlling the sample temperature to within60.1 C,and a readout system to display viscosity.Thedimensions of the sample cup and paddle are shown in Figs.1-3.6.2 ThermometerAny thermometric device can be used tomonitor the temperature of the sample being conditioned fortesting.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 Oct.1,2017.Published October 2017.Originallyapproved in 2006.Last previous edition approved in 2013 as D7226 13.DOI:10.1520/D7226-13R17.2For 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.3The centimetre gram second(cgs)unit of viscosity is the poise(dynes/cm2)andis equivalent to 0.1 Pas.One centipoise(cP)is one millipascal second(mPas).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 FIG.1 Paddle DimensionsFIG.2 Sample Cup DimensionsD7226 13(2017)2 6.3 SieveAn 850-m sieve or a 20-mesh strainer of wirecloth,framed or unframed,conforming to Specification E11 isused.6.4 Oven/Water BathAn oven/water bath capable o