ASTM D7556-10

Standard Test Methods for Determining Small-Strain Tensile Properties of Geogrids and Geotextiles by In-Air Cyclic Tension Tests

SIGNIFICANCE AND USE
Test Methods A, B, and C provide a means of evaluating the tensile modulus of geogrids and geotextiles for applications involving small-strain cyclic loading. The test methods allow for the determination of cyclic tensile modulus at different levels of prescribed or permanent strain, thereby accounting for possible changes in cyclic tensile modulus with increasing permanent strain in the material. These test methods shall be used for research testing and to define properties for use in specific design methods.
In cases of dispute arising from differences in reported test results when using these test methods 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 shall be found and corrected or the purchaser and supplier shall agree to interpret future test results in light of the known bias.
All geogrids can be tested by Test Methods A or B. 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.
Most geotextiles can be tested by Test Method C. Some modification of clamping techniques may be necessary for a given geotextile depending upon its str...
SCOPE
1.1 These test methods cover the determination of small-strain tensile properties of geogrids and geotextiles by subjecting wide-width specimens to cyclic tensile loading.
1.2 These test methods (A, B, and C) allow for the determination of small-strain cyclic tensile modulus by the measurement of cyclic tensile load and elongation.
1.3 This test method is intended to provide properties for design. The test method was developed for mechanistic-empirical pavement design methods requiring input of the reinforcement tensile modulus. The use of cyclic modulus from this test method for other applications involving cyclic loading should be evaluated on a case-by-case basis.
1.4 Three test methods (A, B, and C) are provided to determine small-strain cyclic tensile modulus on geogrids and geotextiles.
1.4.1 Test Method A—Testing a relatively wide specimen of geogrid in cyclic tension in kN/m (lbf/ft).
1.4.2 Test Method B—Testing multiple layers of a relatively wide specimen of geogrid in cyclic tension in kN/m (lbf/ft).
1.4.3 Test Method C—Testing a relatively wide specimen of geotextile in cyclic tension in kN/m (lbf/ft).
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard.
1.6 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

• Status: Historical
• Publication Date: 31-Jan-2010
• ICS: 59.080.40 - Coated fabrics
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.01 - Mechanical Properties

Relations

• Replaced By: ASTM D7556-10(2019) - Standard Test Methods for Determining Small-Strain Tensile Properties of Geogrids and Geotextiles by In-Air Cyclic Tension Tests
• Effective Date: 01-Apr-2019

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7556 − 10
Standard Test Methods for
Determining Small-Strain Tensile Properties of Geogrids and
1
Geotextiles by In-Air Cyclic Tension Tests
This standard is issued under the fixed designation D7556; 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 2. Referenced Documents
2
1.1 These test methods cover the determination of small- 2.1 ASTM Standards:
strain tensile properties of geogrids and geotextiles by subject- D76 Specification for Tensile Testing Machines for Textiles
ing wide-width specimens to cyclic tensile loading. D123 Terminology Relating to Textiles
D579 Specification for Greige Woven Glass Fabrics
1.2 These test methods (A, B, and C) allow for the deter-
D4354 Practice for Sampling of Geosynthetics and Rolled
mination of small-strain cyclic tensile modulus by the mea-
Erosion Control Products (RECPs) for Testing
surement of cyclic tensile load and elongation.
D4439 Terminology for Geosynthetics
1.3 This test method is intended to provide properties for
design. The test method was developed for mechanistic- 3. Terminology
empirical pavement design methods requiring input of the
3.1 Definitions:
reinforcementtensilemodulus.Theuseofcyclicmodulusfrom
3.1.1 atmosphere for testing geosynthetics, n—air main-
this test method for other applications involving cyclic loading
tained at a relative humidity of 50 to 70 % and a temperature
should be evaluated on a case-by-case basis.
of 21 6 2°C (70 6 4°F).
1.4 Three test methods (A, B, and C) are provided to
3.1.2 corresponding force, n—synonym for force at speci-
determine small-strain cyclic tensile modulus on geogrids and
fied elongation.
geotextiles.
3.1.3 force at specified elongation (FASE), n—force associ-
1.4.1 Test Method A—Testing a relatively wide specimen of
ated with a specific elongation on the force-elongation curve.
geogrid in cyclic tension in kN/m (lbf/ft).
(Synonym for corresponding force.)
1.4.2 Test Method B—Testing multiple layers of a relatively
3.1.4 force-elongation curve, n—in a tensile test, graphical
wide specimen of geogrid in cyclic tension in kN/m (lbf/ft).
representation of the relationship between the magnitude of an
1.4.3 Test Method C—Testing a relatively wide specimen of
externally applied force and the change in length of the
geotextile in cyclic tension in kN/m (lbf/ft).
specimen in the direction of the applied force. (Synonym for
1.5 The values stated in SI units are to be regarded as
stress-strain curve.)
standard. The values given in parentheses are provided for
3.1.5 geogrid, n—geosynthetic formed by a regular network
information only and are not considered standard.
of integrally connected elements with apertures greater than
1.6 This standard does not purport to address all of the
1
6.35 mm ( ⁄4 in.) to allow interlocking with surrounding soil,
safety concerns, if any, associated with its use. It is the
rock, earth, and other surrounding materials to primarily
responsibility of the user of this standard to establish appro-
function as reinforcement.
priate safety and health practices and determine the applica-
3.1.6 geosynthetic, n—product manufactured from poly-
bility of regulatory limitations prior to use.
meric material used with soil, rock, earth, or other geotechnical
1
These test methods are under the jurisdiction of ASTM Committee D35 on
2
Geosynthetics and are the direct responsibility of Subcommittee D35.01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Mechanical Properties. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Current edition approved Feb. 1, 2010. Published April 2010. DOI:10.520/ Standards volume information, refer to the standard’s Document Summary page on
D7556–10. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7556 − 10
engineering related material as an integral part of a man made scribed rate of extension, applying a uniaxial cyclic load to the
project, structure, or system. specimen over specified limits of cyclic axial strain and
centered around six successively greater levels of prescribed or
3.1.7 geotextile, n—any permeable textile material used
permanent axial strain. Tensile modulus in kN/m (lbf/ft) of the
with foundation, soil, rock, earth, or any other geotechnical
testspecimencanbecalculatedateachlevelofprescribedaxial
engineering related material, as an integral part of a man-made
strain from the last cycles of load from machine scales, dials,
project
...