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ASTM D 6992 Document Information:
Title
Standard Test Method for Accelerated Tensile Creep and Creep-Rupture of Geosynthetic Materials Based on Time-Temperature Superposition Using the Stepped Isothermal Method
ASTM International
Publication Date:
Dec 1, 2003
Scope:
This test method covers accelerated testing for tensile creep, and
tensile creep-rupture properties
using the Stepped Isothermal Method (SIM).
The test method is focused on geosynthetic reinforcement materials
such as yarns, ribs of geogrids,
or narrow geotextile specimens.
The SIM tests are laterally unconfined tests based on time-temperature
superposition procedures.
Tensile tests are to be completed before SIM tests and the results are
used to determine the stress
levels for subsequent SIM tests defined in terms of the percentage of
Ultimate Tensile Strength
(TULT). Additionally, the tensile test can be designed to provide
estimates of the initial elastic
strain distributions appropriate for the SIM results.
Ramp and Hold (R+H) tests may be completed in conjunction with SIM
tests. They are designed to
provide additional estimates of the initial elastic and initial rapid
creep strain levels
appropriate for the SIM results.
Values stated in SI units are to be regarded as standard. The common
units given in parentheses are
for information only.
This method can be used to establish the sustained load creep and
creep-rupture characteristics of
a geosynthetic. Results of this method are to be used to augment
results of Test Method D 5262 and
may not be used as the sole basis for determination of long term creep
and creep-rupture behavior
of geosynthetic material.
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:
- creep
- creep-rupture
- geosynthetics
- ramp and hold test
- rapid loading tensile test
- stepped isothermal method
- time-temperature superposition
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