ASTM_D_2493_-_D_2493M_-_09.pdf

Designation:D2493/D2493M09StandardViscosity-Temperature Chart for Asphalts1This standard is issued under the fixed designation D2493/D2493M;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 The viscosity-temperature chart covered by this stan-dard is a convenient means of plotting data for estimating theviscosity of asphalts at any temperature within a limited range.Conversely,the chart may be used to ascertain the temperatureat which a desired viscosity is attained.1.2 The chart is suitable for original asphalt cements and forasphalts recovered from laboratory aging tests or extractedfrom pavements.1.3 The chart is based on a viscositytemperature relation-ship that can be plotted using any appropriate set of units.Forconvenience,charts based on both conventional and SI unitsare provided.1.4 The range of the chart is sufficient for roofing asphalts.1.5 The range of the chart is sufficient for liquid asphalts(bitumens)whose viscosity exceeds 0.01 Pa.S(10 centipoise).1.6 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 non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2D341 Practice for Viscosity-Temperature Charts for LiquidPetroleum ProductsD2170 Test Method for Kinematic Viscosity of Asphalts(Bitumens)D2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD3205 Test Method for Viscosity of Asphalt with Cone andPlate Viscometer(Withdrawn 2000)3D4402 Test Method for Viscosity Determination of Asphaltat Elevated Temperatures Using a Rotational ViscometerD4957 Test Method forApparent Viscosity ofAsphalt Emul-sion Residues and Non-Newtonian Bitumens by VacuumCapillary Viscometer3.Significance and Use3.1 The viscosity-temperature chart is a convenient meansof plotting the viscosity data for estimating the viscosity ofasphalts,recovered asphalts,and roofing asphalts at anytemperature within a limited range.It is also a convenientmeans to estimate the temperature at which a desired viscosityis attained.Charts may be constructed manually or usingcomputer graphing software.3.2 Kinematic viscosity-temperature charts are described inCharts D341.4.Description4.1 For Fig.1,the chart coordinates are logarithm of thelogarithm of the viscosity in mPa.S as the ordinate,andlogarithm of the absolute temperature in degrees Kelvin(degrees C+273.2)as the abscissa.However,the viscosity inPa.S and the temperature in degrees Celsius is shown in thechart for convenience.1 Pa.s 5 mPa.s 3103!(1)4.2 For Fig.2,the chart coordinates are logarithm of thelogarithm of the viscosity in centipoise as the ordinate,andlogarithm of the absolute temperature in degrees Rankine(degrees F+459.7)as the abscissa.However,viscosity inpoise,and the temperature in degrees Fahrenheit is shown inthe chart for convenience.4.3 The temperature range of the charts may be extended orabbreviated as necessary.5.Procedure5.1 If the viscosities are not known they should be deter-mined in accordance with Test Methods D2170,D2171,1This chart is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.44 onRheological Tests.Current edition approved Dec.1,2009.Published January 2010.Originallyapproved in 1966.Last previous edition approved in 2001 as D2493 011.DOI:10.1520/D2493_D2493M-09.2For 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 States1 D3205,D4402,or D4957.Viscosities determined at tempera-tures other than the temperatures specified in each of these testmethods may be used.5.2 For temperatures above 60C 140F,plot twoviscosity-temperature points and carefully draw a straight linethrough the points.Plot at least three viscosity-temperaturepoints if the included temperature range is below 60C140F.Carefully draw a straight line or curve through thepoints.A point on this line,within the temperature range of thepoints plotted,shows the viscosity at the corresponding desiredtemperature.NOTE1These charts are appropriate for use at higher temperatures,where asphalts are primarily viscous.At lower temperatures most asphaltsbecome viscoelastic.When this occurs,viscosity alone is insufficient todescribe an asphalts flow properties.Mo