1、Designation: D7643 10Standard Practice forDetermining the Continuous Grading Temperatures andContinuous Grades for PG Graded Asphalt Binders1This standard is issued under the fixed designation D7643; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase 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 practice is used to determine the continuous grad-ing temperatures and continuous gr
3、ade for an asphalt bindergraded in accordance with the specification criteria specified inD6373, Standard Specification for Performance Graded As-phalt Binders.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 standar
4、d 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM
5、 Standards:2D8 Terminology Relating to Materials for Roads and Pave-ments3D2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt (Rolling Thin-Film Oven Test)D6373 Specification for Performance Graded AsphaltBinderD6521 Practice for Accelerated Aging of Asphalt BinderUsing a Pressur
6、ized Aging Vessel (PAV)D6648 Test Method for Determining the Flexural CreepStiffness of Asphalt Binder Using the Bending BeamRheometer (BBR)D6723 Test Method for Determining the Fracture Propertiesof Asphalt Binder in Direct Tension (DT)3D6816 Practice for Determining Low-Temperature Perfor-mance Gr
7、ade (PG) of Asphalt BindersD7175 Test Method for Determining the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eter3. Terminology3.1 Definitions:Definitions for many terms common to asphalt cement andasphalt binder are found in Terminology D8.3.2 Definitions of Terms Specific
8、 to This Standard:3.2.1 continuous grading temperatures, Tc, nthe high,intermediate, and low temperatures at which the specificationrequirements given in Tables 1 or 2 of Specification D6373 aremet.3.2.2 continuous grade, na grade defined by upper andlower continuous grading temperatures.3.2.3 PG gr
9、ading temperatures, TPG, nthe temperatureslisted in Specification D6373 used to designate the grade of aPG binder, for example, 64C, 22C and -28C for a PG 64-28.3.2.4 test temperatures, T1and T2, ntwo PG gradingtemperatures, one grade apart and with T2T1such that the testproperties at the two temper
10、atures bracket the specificationrequirement for the property in question.3.2.5 specification requirements, nthe limiting valuesgiven in Specification D6373 that are used to grade an asphaltbinder, for example, 1.00 kPa for G*/sind, 300 MPa for S(60),etc.4. Summary of Practice4.1 The temperatures req
11、uired to determine the continuousgrading temperatures and grade are obtained from test resultsobtained at the specification grading temperatures as listed inSpecification D6373 and, for each specification requirement, ata second temperature above or below the specification gradingtemperature. The co
12、ntinuous grading temperature is deter-mined by interpolating between the two test temperatures tocalculate the test temperature at which the specification re-quirement is met. The continuous grading temperatures arethen used to determine the continuous grade of the asphaltbinder.1This practice is un
13、der the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.44 onRheological Tests.Current edition approved June 1, 2010. Published March 2011. DOI: 10.1520/D764310.2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
14、rcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Ba
15、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Significance and Use5.1 The continuous grading temperatures and continuousgrade are used for informational purposes only and are not usedfor the sale or purchase of asphalt binders. The continuousgrading temperatures an
16、d continuous grade may be used forforensic or research studies and when producing, blending,modifying, or otherwise evaluating asphalt binders. This guideis applicable to Specification D6373, Tables 1 and 2.6. Procedure6.1 Conduct testsFor each of the specification properties(for example, G*/sind, S
17、(60), etc.) for which a TCis to becalculated determine the test results at two temperatures, T1andT2such that T2is greater than T1. The difference between T1andT2shall be 6C for the upper and lower test temperatures and3C for the intermediate temperature. The two temperaturesshall provide test resul
18、ts that bracket the specification require-ments.NOTE 1For example, a PG 64-XX tested for G*/sind at 64C and70C may give test results of 1.86 and 0.89 kPa respectively. These resultsbracket the specification requirement, 1.00 kPa.6.1.1 If the results of the applicable specification provides atemperat
19、ure rather than a limiting property value (for example,TCRin Specification D6373, Table 2) then the temperature shallbe used as the continuous grading temperature.6.2 Perform Interpolation to Determine Continuous Grad-ing TemperaturesFor each pair of test results obtained as per6.1 determine the con
20、tinuous grading temperature by interpo-lating between T1and T2to determine the temperature at whichthe test results equal the specification requirement. The inter-polated temperature shall be reported as the continuous gradingtemperature.6.2.1 The interpolation for each of the properties, except the
21、m-value, shall be done using a linear relationship between thetest results (log10scale) and the test temperature (arithmeticscale). The interpolation takes the following form:TC5 T11Slog10PS! log10P1!log10P2! log10P1!DT2 T1! (1)where:TC= Continuous grading temperature, C,T1= Lower of the two test te
22、mperatures, C,PS= Specification requirement for property in question;determined at the respective PG grading temperaturefor the respective property,P1= Test result for the specification property in question atT1,P2= Test result for the specification property in question atT2, andT2= Higher of two te
23、st temperatures, C.6.2.2 The interpolation for the m-value shall be done usingan arithmetic scale. The interpolation takes the following form:TC5 T11SPS P1P2 P1DT2 T1! (2)NOTE 2Equations 1 and 2 are valid whether the test results increasewith temperature or decrease with temperature. When using thes
24、e equa-tions retain the negative signs for temperatures below 0C.NOTE 3Because the properties are a non-linear function of tempera-ture linear interpolation results in a slight error in the estimated values ofTC.6.3 Determine Continuous GradeDetermine the continu-ous grade based on the upper and low
25、er continuous gradingtemperature using the same rationale as presented in Specifi-cation D6373. The lower of the two upper continuous gradingtemperatures (for G*/sind, Original and RTFO) shall determinethe upper continuous grade. The upper of the two continuousgrading temperatures (for S and m, PAV)
26、 shall determine thelower continuous grade. The intermediate temperature criterionas given in Specification D6373 is not considered whendetermining the continuous grade but may be reported inparenthesis as a suffix to the continuous grade. Sample prob-lems are given in Appendix X1.7. Report7.1 Conti
27、nuous Grading TemperaturesReport the upper,intermediate, and lower continuous grading temperatures to thenearest 0.1C using the procedure as described in 6.2.7.2 Intermediate Continuous Grading Temperature(Optional)Although the intermediate criteria is not consid-ered when determining the continuous
28、 grade, the intermediatecontinuous grading temperature may be included for informa-tional purposes as part of the continuous grade.7.3 Continuous GradeReport the continuous grade to thenearest 0.1C using the procedure as described in 6.2.Ifrequired, the continuous intermediate temperature may berepo
29、rted in parentheses as a suffix to the continuous grade, forexample, PG 61.9-22.6 (19.3).7.4 Depending upon the use of the results, all of theinformation requested in Section 8. may not be required. If thisis the case, it is only necessary to report the required informa-tion.8. Keywords8.1 continuou
30、s grading temperature; continuous grade; per-formance graded binders (PG Grade)D7643 102APPENDIX(Nonmandatory Information)X1. SAMPLE PROBLEMSX1.1 See Table X1.1, Fig. X1.1, and Fig. X1.2 .D7643 103TABLE X1.1 Interpolation for mA B C D E F DifferenceBetween linear andpolynomialEstimate,Arithmetic Sca
31、leDifferenceBetweenlinear and polynomialEstimate,Semi-LogScaleT, C m=0.300,Polynomial Interpolation (3 pts)T, C m=0.300,Linear Interpolation (2 pts)AsphaltSourceArithmeticScaleSemi-LogScaleDifferenceArith-SemilogArithmeticScaleSemi-LogScaleDifferenceArith-SemilogAAC-1 -16.79 -16.73 0.06 -16.67 -16.6
32、 0.09 -0.12 -0.15AAD-1 -24.60 -24.60 0.00 -24.6 -24.5 0.10 0.00 -0.10AAF-1 -9.55 -9.59 -0.04 -9.8 -9.6 0.16 0.21 0.02AAM-1 -11.35 -11.34 0.01 -11.3 -11.4 -0.06 -0.03 0.04ABL-1 -19.93 -19.95 -0.02 -19.9 -19.8 0.14 -0.03 -0.19ABM-2 -10.10 -10.12 -0.02 -10.3 -10.0 0.24 0.15 -0.11Col. A = Data obtained
33、by plotting three values of m versus temperature using an arithmetic scale. Second order polynomial was fit to the three data points and thetemperature at m = 0.300 was calculated.Col. B = Data obtained by plotting three values of m versus temperature using a semi-log scale (T vs. log m). Second ord
34、er polynomial was fit to the three data pointsand the temperature at m = 0.300 was calculated.Col. C = Difference between T 0.30 estimated from polynomial regression using arithmetic and semi-log scales.Col. D = Data obtained by plotting two values of m (bracketing 0.300) versus temperature using an
35、 arithmetic scale. Linear interpolation was used to calculateTm = 0.300.Col. E = Data obtained by plotting two values to m (bracketing 0.300) versus temperature using a semi-log scale. Linear interpolation was used to calculate T m = 0.300.Col. F = Difference between T 0.30 estimated from linear int
36、erpolation on an arithmetic and semi-log scale.D7643 104ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent
37、 rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either
38、 for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hea
39、ring you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard
40、 may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. X1.1 Sample Calculations Determining for Continuous Grading InformationFIG. X1.2 Sample Calculations Determining for Continuous Grading Information(A)D7643 105
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