ASTM D5262-07
(Test Method)Standard Test Method for Evaluating the Unconfined Tension Creep and Creep Rupture Behavior of Geosynthetics
Standard Test Method for Evaluating the Unconfined Tension Creep and Creep Rupture Behavior of Geosynthetics
SIGNIFICANCE AND USE
This test method is developed for use in the determination of anticipated total elongation or time to rupture that may occur in geosynthetics under sustained loading conditions.
5.1.1 The test data can be used in conjunction with interpretive methods to evaluate creep strain potential at design loads.
5.1.2 The test data can be used in conjunction with interpretive methods to evaluate creep rupture potential at various loads.
This test method is not intended for routine acceptance testing of geosynthetics. This test method should be used to characterize geosynthetics intended for use in applications in which creep or creep rupture is of concern. The plane strain or rupture condition imposed during testing must be considered when using the test results for design.
The basic distinctions between this test method and other test methods for measuring tension creep and creep rupture behavior are (1) the width of the specimens (Section 8) and (2) the measurement of total elongation or time to rupture from the moment of specimen loading. The greater widths of the specimens specified in this test method minimize the contraction edge effect (necking) that occurs in many geosynthetic materials and provides a closer relationship to actual material behavior in plane strain tension conditions.
The creep or stress rupture of a given geosynthetic is likely to be reduced in soil because of load transfer to the soil. The unconfined environment represents a controlled test, in which the results are conservative with regard to the behavior of the material in service. Confined or in-soil testing may model the field behavior of the geosynthetic more accurately.
SCOPE
1.1 This test method is intended for use in determining the unconfined tension creep and creep rupture behavior of geosynthetics at constant temperature when subjected to a sustained tensile loading. This test method is applicable to all geosynthetics.
1.2 The test method measures total elongation of the geosynthetic test specimen, from the time of loading, while being maintained at a constant temperature. It includes procedures for measuring the tension creep and creep rupture behavior at constant temperature of conditioned geosynthetics as well as directions for calculating tension creep and creep rupture curves.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
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Standards Content (Sample)
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Designation:D5262 −07
StandardTest Method for
Evaluating the Unconfined Tension Creep and Creep
1
Rupture Behavior of Geosynthetics
This standard is issued under the fixed designation D5262; 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 D4595 Test Method for Tensile Properties of Geotextiles by
the Wide-Width Strip Method
1.1 This test method is intended for use in determining the
D6637 Test Method for Determining Tensile Properties of
unconfined tension creep and creep rupture behavior of geo-
Geogrids by the Single or Multi-Rib Tensile Method
synthetics at constant temperature when subjected to a sus-
E6 Terminology Relating to Methods of Mechanical Testing
tained tensile loading. This test method is applicable to all
geosynthetics.
3. Terminology
1.2 The test method measures total elongation of the geo-
3.1 Definitions—For definitions of many terms used in this
synthetic test specimen, from the time of loading, while being
test method, refer to Terminologies D123, D4439 and E6.
maintained at a constant temperature. It includes procedures
3.2 Definitions of Terms Specific to This Standard:
for measuring the tension creep and creep rupture behavior at
3.2.1 atmosphere for testing geosynthetics, n—air main-
constant temperature of conditioned geosynthetics as well as
tained at a relative humidity between 50 and 70 % and the test
directions for calculating tension creep and creep rupture
(Section 10.2).
curves.
3.2.2 creep,n—thetime-dependentincreaseinaccumulative
1.3 The values stated in SI units are to be regarded as the
strain in a material resulting from an applied constant force.
standard. The values given in parentheses are for information
only.
3.2.3 design load, n—the load at which the geosynthetic is
1.4 This standard does not purport to address all of the
required to operate in order to perform its intended function.
safety concerns, if any, associated with its use. It is the
3.2.4 failure, n—an arbitrary point at which a material
responsibility of the user of this standard to establish appro-
ceases to be functionally capable of its intended use.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 3.2.5 geogrid, n—a geosynthetic formed by a regular net-
work of integrally connected elements with apertures greater
2. Referenced Documents 1
than 6.35 mm ( ⁄4 in.) to allow interlocking with surrounding
2
soil, rock, earth, and other surrounding materials to function
2.1 ASTM Standards:
primarily as reinforcement.
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
3.2.6 geomembrane,n—anessentiallyimpermeablegeosyn-
D2990 Test Methods for Tensile, Compressive, and Flexural
thetic composed of one or more synthetic sheets.
Creep and Creep-Rupture of Plastics
3.2.6.1 Discussion—In geotechnical engineering, essen-
D4354 Practice for Sampling of Geosynthetics for Testing
tially impermeable means that no measurable liquid flows
D4439 Terminology for Geosynthetics
through a geosynthetic when tested in accordance with Test
D4491 Test Methods for Water Permeability of Geotextiles
Methods D4491.
by Permittivity
3.2.7 geosynthetic, n—a planar product manufactured from
polymeric material used with soil, rock, earth, or other geo-
1
This test method is under the jurisdiction of ASTM Committee D35 on
technical engineering-related material as an integral part of a
Geosynthetics and is the direct responsibility of Subcommittee D35.02 on Endur-
man-made project, structure, or system.
ance Properties.
Current edition approved June 1, 2007. Published August 2007. Originally
3.2.8 geotextile, n—a permeable geosynthetic comprised
approved in 1992. Last previous edition approved in 2006 as D5262 – 06. DOI:
10.1520/D5262-07. solely of textiles.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.8.1 Discussion—Current manufacturing techniques pro-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
duce nonwoven fabrics, knitted (non-tubular) fabrics, and
Standardsvolume information, refer to the standards’s Document Summary page on
the ASTM website. woven fabrics.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5262−07
3.2.9 index test, n—a test procedure that may contain a 6.1.1 Clamps should be at least as wide as the specimen,
known bias, but that may be used to establish an order for a set with appropriate clamping power that will preven
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