ASTM_D_4989_-_D_4989M_-_90a_2021.pdf

Designation:D4989/D4989M90a(Reapproved 2021)Standard Test Method forApparent Viscosity(Flow)of Roofing Bitumens Using theParallel Plate Plastometer1This standard is issued under the fixed designation D4989/D4989M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of apparentviscosity of roofing bitumen by means of a parallel plateplastometer.This test method is applicable for a viscosity rangefrom 102to 109Pas 103to 1010poises.See Note 1.NOTE1This relatively simple test method of measuring viscosity usespredetermined,arbitrary shear stress levels.Since roofing bitumens arenon-Newtonian,other viscosity test methods may give different results.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 nonconformancewith the standard.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/D140M Practice for Sampling Asphalt MaterialsD312/D312M Specification for Asphalt Used in RoofingD450/D450M Specification for Coal-Tar Pitch Used inRoofing,Dampproofing,and WaterproofingD2171/D2171M Test Method for Viscosity of Asphalts byVacuum Capillary ViscometerD3205 Test Method for Viscosity of Asphalt with Cone andPlate Viscometer(Withdrawn 2000)33.Terminology3.1 DefinitionsSee definitions of viscosity given in TestMethods D2171/D2171M and D3205.4.Summary of Test Method4.1 The sample is molded into a disc of specifieddimensions,heated to the selected temperature,placed betweenthe plates of the pre-heated apparatus,and pressed understandard conditions for a measured time.The apparent viscos-ity is calculated from the final diameter of the pressedspecimen disc.5.Apparatus5.1 Parallel Plate PlastometerA modified form of Wil-liams plastometer as shown in Figs.1 and 2.Mass of PlatenAis 5000 6 50 g 11.02 6 0.11 lb.5.2 Ring Molds,with an inside diameter of 25.40 60.01 mm 1.0000 6 0.0025 in.and a height of 12.70 60.01 mm 0.5000 6 0.0025 in.cut from copper or brasstubing.5.3 Constant-Temperature Oven,capable of maintaining testtemperature within 60.1 C 60.2 F.5.4 Scale,linearly graduated in millimeters over at least150 mm 6 in.and accurate to 60.5 mm 60.02 in.6.Sampling6.1 Sample the material to be tested in accordance withPractice D140/D140M.7.Test Specimens7.1 Prepare two molds by coating with a pasty mixture oftalc in glycerine as a mold release agent.Coat all surfaces of1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.03 onSurfacing and Bituminous Materials for Membrane Waterproofing and Built-upRoofing.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 1990.Last previous edition approved in 2014 as D4989/D4989M 90a(2014)1.DOI:10.1520/D4989_D4989M-90AR21.2For 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 last approved version of this historical standard is referenced onwww.astm.org.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.1each mold by brushing or applying the paste with a fingertip.Place the rings on a brass or aluminum plate coated with therelease agent.7.2 Bring the sample to pouring temperature by heating inan oven for not more than 30 min.Heat the sample with careto prevent local overheating,stirring until it has becomesufficiently fluid to pour readily.Avoid incorporating airbubbles in the sample.Pour the heated sample into the ringmolds unti