ASTM D7173-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7173 −20
Standard Practice for
Determining the Separation Tendency of Polymer from
1
Polymer-Modified Asphalt
This standard is issued under the fixed designation D7173; 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 D36/D36M Test Method for Softening Point of Bitumen
(Ring-and-Ball Apparatus)
1.1 This practice describes a laboratory procedure for de-
D3666 Specification for Minimum Requirements for Agen-
termining the tendency of polymer to separate from polymer-
cies Testing and Inspecting Road and Paving Materials
modified asphalt under static heated storage conditions. The
D7175 Test Method for Determining the Rheological Prop-
resultsoftestingonmaterialpreparedaccordingtothispractice
erties of Asphalt Binder Using a Dynamic Shear Rheom-
may be used as a guideline when formulating products or to
eter
establish field handling procedures. Large differences in test
results between top and bottom specimens indicate that there is D7405 Test Method for Multiple Stress Creep and Recovery
a degree of incompatibility between the polymer and the base (MSCR) of Asphalt Binder Using a Dynamic Shear
asphalt.
Rheometer
1.2 The values stated in SI units are to be regarded as the
3. Summary of Practice
standard. No other units of measurement are included in this
standard.
3.1 A measured quantity of polymer-modified asphalt in a
1.3 The text of this standard references notes and footnotes
sealed aluminum tube is conditioned in a vertical position for
which provide explanatory material. These notes and footnotes
48 h at a temperature of 163 6 5 °C. At the end of the
(excluding those in tables and figures) shall not be considered
conditioning period, top and bottom portions are separated and
as requirements of the standard.
subjected to further testing to determine the degree of separa-
tion. Tests chosen for this purpose depend on the polymer
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the modification system being evaluated and the type of informa-
responsibility of the user of this standard to establish appro- tion desired by the user. Softening point (Test Method D36/
priate safety, health, and environmental practices and deter-
D36M) and DSR (Test Method D7175) are the most common
mine the applicability of regulatory limitations prior to use.
tests used for this purpose. MSCR (Test Method D7405)isan
1.5 This international standard was developed in accor-
alternate test.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
4.1 Purchasers of polymer-modified asphalt need guidelines
mendations issued by the World Trade Organization Technical
on proper storage and handling procedures to maintain the
Barriers to Trade (TBT) Committee.
integrity of material they have purchased. This practice pro-
2. Referenced Documents
vides a significant tool for understanding the characteristics of
2
these materials as well as comparing various sources of supply.
2.1 ASTM Standards:
NOTE 1—The quality of the results produced by this standard are
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
dependent on the competence of the personnel performing the procedure
Paving Materials and is the direct responsibility of Subcommittee D04.47 on
and the capability, calibration, and maintenance of the equipment used.
Miscellaneous Asphalt Tests.
Agencies that meet the criteria of Specification D3666 are generally
Current edition approved May 1, 2020. Published May 2020. Originally
considered capable of competent and objective testing, sampling,
approved in 2005. Last previous edition approved in 2014 as D7173 – 14. DOI:
inspection, etc. Users of this standard are cautioned that compliance with
10.1520/D7173-20.
2 Specification D3666 alone does not completely ensure reliable results.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Reliable results depend on many factors; following the suggestions of
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Specification D3666 or some similar acceptable guideline provides a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. means of evaluating and controlling some of those factors.
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