ASTM D7643-10

Standard Practice for Determining the Continuous Grading Temperatures and Continuous Grades for PG Graded Asphalt Binders

SIGNIFICANCE AND USE
The continuous grading temperatures and continuous grade are used for informational purposes only and are not used for the sale or purchase of asphalt binders. The continuous grading temperatures and continuous grade may be used for forensic or research studies and when producing, blending, modifying, or otherwise evaluating asphalt binders. This guide is applicable to Specification D6373, Tables 1 and 2.
SCOPE
1.1 This practice is used to determine the continuous grading temperatures and continuous grade for an asphalt binder graded in accordance with the specification criteria specified in D6373, Standard Specification for Performance Graded Asphalt Binders.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: D04 - Road and Paving Materials
• Drafting Committee: D04.44 - Rheological Tests

Relations

• Referred By: ASTM D7313-20 - Standard Test Method for Determining Fracture Energy of Asphalt Mixtures Using the Disk-Shaped Compact Tension Geometry
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7643 − 10
Standard Practice for
Determining the Continuous Grading Temperatures and
Continuous Grades for PG Graded Asphalt Binders
This standard is issued under the fixed designation D7643; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D7175 Test Method for Determining the Rheological Prop-
erties of Asphalt Binder Using a Dynamic Shear Rheom-
1.1 This practice is used to determine the continuous grad-
eter
ing temperatures and continuous grade for an asphalt binder
graded in accordance with the specification criteria specified in
3. Terminology
D6373, Standard Specification for Performance Graded As-
phalt Binders.
3.1 Definitions: Definitions for many terms common to
asphalt cement and asphalt binder are found in Terminology
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this D8.
standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.2.1 continuous grading temperatures, T,n—the high,
c
safety concerns, if any, associated with its use. It is the
intermediate, and low temperatures at which the specification
responsibility of the user of this standard to establish appro-
requirements given in Tables 1 or 2 of Specification D6373 are
priate safety and health practices and determine the applica-
met.
bility of regulatory limitations prior to use.
3.2.2 continuous grade, n—a grade defined by upper and
lower continuous grading temperatures.
2. Referenced Documents
3.2.3 PG grading temperatures, T ,n—the temperatures
2.1 ASTM Standards: PG
listed in Specification D6373 used to designate the grade of a
D8 Terminology Relating to Materials for Roads and Pave-
PG binder, for example, 64ºC, 22ºC and -28ºC for a PG 64-28.
ments
D2872 Test Method for Effect of Heat and Air on a Moving
3.2.4 test temperatures, T and T,n—two PG grading
1 2
Film of Asphalt (Rolling Thin-Film Oven Test)
temperatures, one grade apart and with T >T such that the
2 1
D6373 Specification for Performance Graded Asphalt
test properties at the two temperatures bracket the specification
Binder
requirement for the property in question.
D6521 Practice for Accelerated Aging of Asphalt Binder
3.2.5 specification requirements, n—the limiting values
Using a Pressurized Aging Vessel (PAV)
given in Specification D6373 that are used to grade an asphalt
D6648 Test Method for Determining the Flexural Creep
binder, for example, 1.00 kPa for G*/sinδ, 300 MPa for S(60),
Stiffness of Asphalt Binder Using the Bending Beam
etc.
Rheometer (BBR)
D6723 Test Method for Determining the Fracture Properties
4. Summary of Practice
of Asphalt Binder in Direct Tension (DT)
D6816 Practice for Determining Low-Temperature Perfor-
4.1 The temperatures required to determine the continuous
mance Grade (PG) of Asphalt Binders
grading temperatures and grade are obtained from test results
obtained at the specification grading temperatures as listed in
Specification D6373 and, for each specification requirement, at
This practice is under the jurisdiction of ASTM Committee D04 on Road and
a second temperature above or below the specification grading
Paving Materials and is the direct responsibility of Subcommittee D04.44 on
temperature. The continuous grading temperature is deter-
Rheological Tests.
mined by interpolating between the two test temperatures to
Current edition approved June 1, 2010. Published March 2011. DOI: 10.1520/
D7643–10.
calculate the test temperature at which the specification re-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
quirement is met. The continuous grading temperatures are
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
then used to determine the continuous grade of the asphalt
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. binder.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7643 − 10
5. Significance and Use
P = Test result for the specification property in question at
T , and
5.1 The continuous grading temperatures and continuous 2
T = Higher of two test temperatures, ºC.
gradeareusedforinformationalpurposesonlyandarenotused 2
for the sale or purchase of asphalt binders. The continuous 6.2.2 The interpolation for the m-value shall be done using
grading temperatures and continuous grade may be used for
an arithmetic scale.The interpolation takes the following form:
forensic or research studies and when producing, blending,
P 2 P
S 1
modifying, or otherwise evaluating asphalt binders. This guide T 5 T 1 ~T 2 T ! (2)
S D
C 1 2 1
P 2 P
2 1
is applicable to Specification D6373, Tables 1 and 2.
NOTE 2—Equations and are valid whether the test results increase with
temperature or decrease with temperature. When using these equations
6. Procedure retain the negative signs for temperatures below 0ºC.
NOTE 3—Because the properties are a non-linear function of tempera-
6.1 Conduct tests—For each of the specification properties
ture linear interpolation results in a slight error in the estimated values of
(for example, G*/sinδ, S(60), etc.) for which a T is to be
T .
C
C
calculated determine the test results at two temperatures, T
6.3 Determine Continuous Grade—Determine the continu-
and T such that T is greater than T . The difference between
2 2 1
ous grade based on the upper and lower continuous grading
T and T shallbe6ºCfortheupperandlowertesttemperatures
1 2
temperature using the same rationale as presented in Specifi-
and 3ºC for the intermediate temperature. The two tempera-
cation D6373. The lower of the two upper continuous grading
tures shall provide test results that bracket the specification
temperatures (for G*/sinδ, Original and RTFO) shall determine
requirements.
the upper continuous grade. The upper of the two continuous
grading temperatures
...