1、Designation:D2493/D2493M16Standard Practice forViscosity-Temperature Chart for Asphalt Binders1This 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
2、.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 asphalt
3、binders at any temperature within a limitedrange.Conversely,the chart may be used to ascertain thetemperature at which a desired viscosity is attained.1.2 The chart is suitable for asphalt binders and for asphaltsrecovered from laboratory aging tests or extracted from pave-ments.1.3 The chart is bas
4、ed on a viscosity-temperature 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 asphalt binderswhose
5、 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 sy
6、stems may result in nonconformancewith 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 Visco
7、meterD4402 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 ViscometerD7175 Test Method for Determining the Rheological Prop-ertie
8、s of Asphalt Binder Using a Dynamic Shear Rheom-eter3.Significance and Use3.1 The viscosity-temperature chart is a convenient meansof plotting the viscosity data for estimating the viscosity ofasphalt binders,recovered asphalts,and roofing asphalts at anytemperature within a limited range.It is also
9、 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 inPractice D341.4.Description4.1 Fig.1 shows an example viscosity-temperature chart.Fo
10、r Fig.1,the chart coordinates are logarithm of the logarithmof the viscosity in centipoise as the ordinate,and logarithm ofthe absolute temperature in degrees Rankine(degrees F+459.7)as the abscissa.However,the viscosity in poise and thetemperature in degrees Fahrenheit are shown in the chart forcon
11、venience.4.2 Fig.2 shows an example viscosity-temperature chart.For Fig.2,the chart coordinates are logarithm of the logarithmof the viscosity in mPaS as the ordinate,and logarithm of theabsolute temperature in degrees Kelvin(degrees C+273.2)asthe abscissa.However,viscosity in PaS and the temperatur
12、e indegrees Celsius are shown in the 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,D4402,D4957,or D7175.Viscosities determ
13、ined at tempera-tures other than the temperatures specified in each of these testmethods may be used.1This practice 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.1,2
14、016.Published January 2017.Originallyapproved in 1966.Last previous edition approved in 2009 as D2493/D2493M 09.DOI:10.1520/D2493_D2493M-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume in
15、formation,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 States1 5.2 For temperatures above 60 C 140 F,plot twoviscosity-temperature points and carefully draw a straight linethrough
16、 the points.Plot at least three viscosity-temperaturepoints if the included temperature range is below 60 C140 F.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 asphaltbinders become viscoelastic.When this occurs,viscosity alone i