ASTM D6818-02(2009)
(Test Method)Standard Test Method for Ultimate Tensile Properties of Turf Reinforcement Mats
Standard Test Method for Ultimate Tensile Properties of Turf Reinforcement Mats
SIGNIFICANCE AND USE
The strip test in this test method is considered satisfactory for acceptance testing of commercial shipments of Turf Reinforcement Mats since the method has been used extensively in the trade for acceptance testing.
In case of disagreement arising from differences in reported test values when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is 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 specimen which are as homogeneous as possible and are from a lot of material of the type in question. The test specimen 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 testing is begun. If bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future results in the light of the known bias.
SCOPE
1.1 This test method covers strip test procedures for determining the tensile properties of Turf Reinforcement Mats (TRM).
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.3 This standard does not apply to TRM's made of composite materials where the component providing the reinforcement cannot be tested for tensile strength with the procedure herein described. In this case, the established ASTM testing method, which is most appropriate for that material, shall be used instead.
1.4 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)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6818 − 02(Reapproved 2009)
Standard Test Method for
Ultimate Tensile Properties of Turf Reinforcement Mats
This standard is issued under the fixed designation D6818; 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 3.1.3 elongation, n—the ratio of the extension of a material
to the length of the material prior to stretching. (Compare
1.1 This test method covers strip test procedures for deter-
extension.)
mining the tensile properties of Turf Reinforcement Mats
(TRM). 3.1.4 extension, n—the change in length of a material due to
stretching. (Compare elongation.)
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are provided for 3.1.5 rupture, v—the act of bursting.
information purposes only.
3.1.6 strip test, n—in TRM testing, a tensile test in which
1.3 This standard does not apply to TRM’s made of com- the full width of the specimen is gripped in the clamps.
posite materials where the component providing the reinforce-
3.1.7 tensile test, n—in geosynthetics, a test in which a
ment cannot be tested for tensile strength with the procedure
geosynthetic material is stretched in one direction to determine
herein described. In this case, the established ASTM testing
the force - elongation characteristics, the breaking force, or the
method, which is most appropriate for that material, shall be
breaking elongation.
used instead.
1.4 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
4.1 A test specimen is clamped in a tensile testing machine
responsibility of the user of this standard to establish appro-
and a force applied to the specimen until it breaks. Values for
priate safety and health practices and determine the applica-
the breaking force and elongation of the test specimen are
bility of regulatory limitations prior to use.
obtained from machine scales, dials, autographic recording
charts, or a computer interfaced with the testing machine.Also,
2. Referenced Documents
points along the stress/strain curve can be reported.
2.1 ASTM Standards:
D76 Specification for Tensile Testing Machines for Textiles
5. Significance and Use
3. Terminology
5.1 The strip test in this test method is considered satisfac-
tory for acceptance testing of commercial shipments of Turf
3.1 Definitions:
Reinforcement Mats since the method has been used exten-
3.1.1 breaking load, n—the maximum force applied to a
sively in the trade for acceptance testing.
specimen in a tensile test carried to rupture.
5.1.1 In case of disagreement arising from differences in
3.1.1.1 Discussion—Materials that are brittle usually rup-
reported test values when using this test method for acceptance
ture at the maximum force. Materials that are ductile usually
testing of commercial shipments, the purchaser and the sup-
experience a maximum force before rupturing.
plier should conduct comparative tests to determine if there is
3.1.2 constant rate of extension (CRE) tensile testing
statistical bias between their laboratories. Competent statistical
machine—a testing machine in which the rate of increase of
assistance is recommended for the investigation of bias. As a
specimen length is uniform with time.
minimum, the two parties should take a group of test specimen
which are as homogeneous as possible and are from a lot of
This test method is under the jurisdiction of ASTM Committee D35 on
material of the type in question. The test specimen should then
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
be randomly assigned in equal numbers to each laboratory for
thetic Erosion Control.
testing.Theaverageresultsfromthetwolaboratoriesshouldbe
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved
compared using Student’s t-test for unpaired data and an
in 2002. Last previous edition approved in 2002 as D6818 – 02. DOI: 10.1520/
D6818-02R09.
acceptable probability level chosen by the two parties before
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
testing is begun. If bias is found, either its cause must be found
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and corrected, or the purchaser and the supplier must agree to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. interpret future results in the light of the known bias.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6818 − 02 (2009)
6. Apparatus 9.4 Read the breaking force and elongation, from the
mechanism provided for such purpose. Record machine and
6.1 Tensile Testing Machine, of the Constant Rate of Exten-
crossmachinedirectionresultsseparately.Ifdesired,additional
sion (CRE) type conforming to Specification D76, with respect
points along the stress/strain curve can be recorded as well.
to force indication, working range, capacity, and elongation
indicator and designed for operation at a speed of 300 6 10 9.5 For some machines, data may be obtained using an
mm/min (12 6 0.5 in./min). interfaced computer.
6.2 Clamps and Jaw Faces—Each jaw face shall be smooth, 9.6 If a specimen slips in the jaws, or breaks at the edge of
or in the jaws, or if for any reason the results falls markedly
flat,andwithametallicorotheragreeduponsurface.Thefaces
shall be parallel and ha
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