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ASTM D 7312 Document Information:
Title
Standard Test Method for Determining the Permanent Shear Strain and Complex Shear Modulus of Asphalt Mixtures Using the Superpave Shear Tester (SST)
ASTM International
Publication Date:
Mar 1, 2007
Scope:
This standard provides performance-related test procedures for
the determination of stiffness complex shear modulus and permanent
shear strain of asphalt mixtures using the Superpave Shear Tester
(SST). This standard is applicable to the testing and analysis of
modified and unmodified asphalt mixtures.
This standard is applicable to specimens prepared in a
laboratory or cored from a pavement for post-construction analysis.
It is intended for use with specimens having the following minimum
dimensions:
NOTE 1—Nominal maximum aggregate size is defined in AASHTO R35
as one sieve larger than the first sieve to retain more than 10 %
of the total aggregate. Asphalt mixtures with a nominal maximum
aggregate size greater than 19 mm can be tested using this
procedure, but it is not recommended. The larger aggregate sizes
may significantly interfere with the material response, thereby
affecting the repeatability of the test.
NOTE 2—The SST shall accommodate test specimens of 150 mm in
diameter and 50 mm in height. The specimen height of 50 mm is
preferred, but may not be available in roadway cores where layer
thickness may be less. If the specimen height is less than 50 mm,
use platen to platen fixturing (Linear Variable Differential
Transformers (LVDTs) or extensometers). Specimen heights less than
38 mm cannot be tested because of equipment constraints.
NOTE 3—The diameter-to-height ratio for shear test specimens
should be 3:1 or greater. This effectively eliminates the use of
100 mm diameter specimens (because of minimum height requirement
for testing discussed in Note 2).
The between laboratory reproducibility of this test method has
not been determined, therefore this standard should not be used for
acceptance or rejection of a material for purchasing purposes.
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.
Keywords:
- complex shear modulus
- frequency sweep
- permanent strain
- repeated shear
- shear testing
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