ASTM D6637-01(2009)
(Test Method)Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method
Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method
SIGNIFICANCE AND USE
The determination of the tensile force-elongation values of geogrids provides index property values. This test method shall be used for quality control and acceptance testing of commercial shipments of geogrids.
In cases of dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using student's t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing began. If a bias is found, either its cause must be found and corrected or the purchaser and supplier must agree to interpret future test results in light of the known bias.
All geogrids can be tested by any of these methods. Some modification of techniques may be necessary for a given geogrid depending upon its physical make-up. Special adaptations may be necessary with strong geogrids, multiple layered geogrids, or geogrids that tend to slip in the clamps or those which tend to be damaged by the clamps.
SCOPE
1.1 This test method covers the determination of the tensile strength properties of geogrids by subjecting strips of varying width to tensile loading.
1.2 Three alternative procedures are provided to determine the tensile strength, as follows:
1.2.1 Method A—Testing a single geogrid rib in tension (N or lbf).
1.2.2 Method B—Testing multiple geogrid ribs in tension (kN/m or lbf/ft).
1.2.3 Method C—Testing multiple layers of multiple geogrid ribs in tension (kN/m or lbf/ft)
1.3 This test method is intended for quality control and conformance testing of geogrids.
1.4 The values stated in SI units are to be regarded as the standard. The inch-pound values stated in parentheses are provided for information only.
1.5 This standard may involve hazardous materials, operations, and equipment. 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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6637–01 (Reapproved 2009)
Standard Test Method for
Determining Tensile Properties of Geogrids by the Single or
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Multi-Rib Tensile Method
This standard is issued under the fixed designation D6637; 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 D5262 Test Method for Evaluating the Unconfined Tension
Creep and Creep Rupture Behavior of Geosynthetics
1.1 This test method covers the determination of the tensile
strength properties of geogrids by subjecting strips of varying
3. Terminology
width to tensile loading.
3.1 Definitions:
1.2 Three alternative procedures are provided to determine
3.1.1 atmosphere for testing geosynthetics, n—air main-
the tensile strength, as follows:
tained at a relative humidity of 50 to 70 % and a temperature
1.2.1 Method A—Testing a single geogrid rib in tension (N
of 21 6 2°C (70 6 4°F).
or lbf).
3.1.2 breaking force, (F), n—the force at failure.
1.2.2 Method B—Testing multiple geogrid ribs in tension
3.1.3 corresponding force, n—synonym for force at speci-
(kN/m or lbf/ft).
fied elongation.
1.2.3 Method C—Testing multiple layers of multiple geo-
3.1.4 force at specified elongation, FASE, n—a force asso-
grid ribs in tension (kN/m or lbf/ft)
ciated with a specific elongation on the force-elongation curve.
1.3 This test method is intended for quality control and
(synonym for corresponding force.)
conformance testing of geogrids.
3.1.5 force-elongation curve, n—in a tensile test, a graphi-
1.4 The values stated in SI units are to be regarded as the
cal representation of the relationship between the magnitude of
standard. The inch-pound values stated in parentheses are
an externally applied force and the change in length of the
provided for information only.
specimen in the direction of the applied force. (synonym for
1.5 This standard may involve hazardous materials, opera-
stress-strain curve.)
tions, and equipment. This standard does not purport to
3.1.6 geogrid, n—a geosynthetic formed by a regular net-
address all of the safety concerns, if any, associated with its
work of integrally connected elements with aperetures greater
use. It is the responsibility of the user of this standard to
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than 6.35 mm ( ⁄4 inch) to allow interlocking with surrounding
establish appropriate safety and health practices and deter-
soil, rock, earth, and other surrounding materials to primarily
mine the applicability of regulatory limitations prior to use.
function as reinforcement. (D5262)
2. Referenced Documents 3.1.7 integral, adj—in geosynthetics, forming a necessary
2 part of the whole; a constituent.
2.1 ASTM Standards:
3.1.8 geosynthetic, n—a product manufactured from poly-
D76 Specification for Tensile Testing Machines for Textiles
meric material used with soil, rock, earth, or other geotechnical
D123 Terminology Relating to Textiles
engineering related material as an integral part of a man made
D1909 StandardTable of Commercial Moisture Regains for
project, structure, or system.
Textile Fibers
3.1.9 index test, n—a test procedure which may contain
D4354 Practice for Sampling of Geosynthetics for Testing
known bias, but which may be used to establish an order for a
D4439 Terminology for Geosynthetics
set of specimens with respect to the property of interest.
3.1.10 junction, n—the point where geogrid ribs are inter-
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This test method is under the jurisdiction of ASTM Committee D35 on
connected to provide structure and dimensional stability.
Geosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-
3.1.11 rib , n—for geogrids, the continuous elements of a
cal Properties.
geogrid which are either in the machine or cross-machine
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved
in 2001. Last previous edition approved in 2001 as D6637 – 01. DOI: 10.1520/
direction as manufactured.
D6637-01R09.
3.1.12 rupture, n—for geogrids, the breaking or tearing
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
apart of ribs.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6637–01 (2009)
3.1.13 tensile, adj—capable of tensions, or relating to ten- cause must be found and corrected or the purchaser and
sion of a material. supplier must agree to interpret future test results in light of the
3.1.14 tensile strength, (a ),
...
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