1、Designation:D4989/D4989M90a(Reapproved 2014)1Standard 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 adoptio
2、n 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.1NOTEUnits information was editorially corrected in January 2014.1.Scope1.1 This test method
3、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 usespre-determined arbitrary shear s
4、tress 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 b
5、e used independently of the other.Combiningvalues from the two systems may result in non-conformancewith 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
6、safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D140 Practice for Sampling Bituminous MaterialsD312 Specification for Asphalt Used in RoofingD450 Specification for Coal-Tar Pitch Used in Roofing,Dampproofin
7、g,and WaterproofingD2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD3205 Test Method for Viscosity of Asphalt with Cone andPlate Viscometer(Withdrawn 2000)33.Terminology3.1 DefinitionsSee definitions of viscosity given in TestMethods D2171 and D3205.4.Summary of Test Method4
8、.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.Appa
9、ratus5.1 Parallel Plate PlastometerA modified form of Wil-liams plastometer as shown in Fig.1 and Fig.2.Mass ofPlaten A is 5000 6 50 g 11.02 6 0.11 lb.5.2 Ring Molds,with an inside diameter of 25.40 6 0.01mm 1.0000 6 0.0025 in.and a height of 12.70 6 0.01 mm0.5000 6 0.0025 in.cut from copper or bras
10、s tubing.5.3 Constant Temperature Oven,capable of maintaining testtemperature within 60.1C 60.2F.5.4 Scale,linearly graduated in millimetres over at least 150mm 6 in.and accurate to 60.5 mm 60.02 in.6.Sampling6.1 Sample the material to be tested in accordance withPractice D140.7.Test Specimens7.1 Pr
11、epare two molds by coating with a pasty mixture oftalc in glycerine as a mold release agent.Coat all surfaces ofeach mold by brushing or applying the paste with a finger tip.Place the rings on a brass or aluminum plate coated with therelease agent.1This test method is under the jurisdiction ofASTM C
12、ommittee 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.1,2014.Published January 2014.Originallyapproved in 1990.Last previous edition approved in
13、 2008 as D4989 90a(2008).DOI:10.1520/D4989_D4989M-90AR14E01.2For 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 l
14、ast 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 States1 7.2 Bring the sample to pouring temperature by heating inan oven for not more than 30 min.Heat the sample with c
15、areto 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 until a slight overflow is achieved.Allow to cool at roomtemperature overnight,and then cut the excess material offcle
16、anly with a slightly heated knife or spatula.Trim the excessmaterial off not more than 1 h before testing.7.3 Just prior to testing,carefully remove each specimenfrom its mold by holding it under a stream of cool tap waterand pressing the specimen from the ring with the fingers.Washthe release agent from all surfaces of the specimen in the coolwater and gently blot dry with a paper towel.7.4 Place the dry specimen between two sheets of thinplastic film(see Note 2),approximately 100 by 100 mm 4 b
