ASTM D6818-02
(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.
5.1.1 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’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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Designation:D6818–02
Standard Test Method for
Ultimate Tensile Properties of Turf Reinforcement Mats
This standard is issued under the fixed designation D 6818; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 constant rate of extension (CRE) tensile testing
machine—a testing machine in which the rate of increase of
1.1 This test method covers strip test procedures for deter-
specimen length is uniform with time.
mining the tensile properties of Turf Reinforcement Mats
3.1.3 elongation, n—the ratio of the extension of a material
(TRM).
to the length of the material prior to stretching. (Compare
1.2 The values stated in SI units are to be regarded as the
extension.)
standard. The values given in parentheses are provided for
3.1.4 extension, n—the change in length of a material due to
information purposes only.
stretching. (Compare elongation.)
1.3 This standard does not apply to TRM’s made of com-
3.1.5 rupture, v—the act of bursting.
posite materials where the component providing the reinforce-
3.1.6 strip test, n—in TRM testing, a tensile test in which
ment cannot be tested for tensile strength with the procedure
the full width of the specimen is gripped in the clamps.
herein described. In this case, the established ASTM testing
3.1.7 tensile test, n—in geosynthetics, a test in which a
method, which is most appropriate for that material, shall be
geosynthetic material is stretched in one direction to determine
used instead.
the force - elongation characteristics, the breaking force, or the
1.4 This standard does not purport to address all of the
breaking elongation.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety and health practices and determine the applica-
4.1 A test specimen is clamped in a tensile testing machine
bility of regulatory limitations prior to use.
and a force applied to the specimen until it breaks. Values for
2. Referenced Documents the breaking force and elongation of the test specimen are
obtained from machine scales, dials, autographic recording
2.1 ASTM Standards:
2 charts, or a computer interfaced with the testing machine.Also,
D 76 Specification forTensileTesting Machines forTextile
points along the stress/strain curve can be reported.
D 123 Terminology Relating to Textiles
D 1776 Practice for Conditioning Textiles for Testing
5. Significance and Use
D 4439 Terminology for Geosynthetics
5.1 The strip test in this test method is considered satisfac-
D 5035 Test Method for Breaking Force and Elongation of
4 tory for acceptance testing of commercial shipments of Turf
Textile Fabrics (Strip Force)
Reinforcement Mats since the method has been used exten-
3. Terminology sively in the trade for acceptance testing.
5.1.1 In case of disagreement arising from differences in
3.1 Definitions:
reported test values when using this test method for acceptance
3.1.1 breaking load, n—the maximum force applied to a
testing of commercial shipments, the purchaser and the sup-
specimen in a tensile test carried to rupture.
plier should conduct comparative tests to determine if there is
3.1.1.1 Discussion—Materials that are brittle usually rup-
statistical bias between their laboratories. Competent statistical
ture at the maximum force. Materials that are ductile usually
assistance is recommended for the investigation of bias. As a
experience a maximum force before rupturing.
minimum, the two parties should take a group of test specimen
which are as homogeneous as possible and are from a lot of
1 material of the type in question. The test specimen should then
This test method is under the jurisdiction of ASTM Committee D35 on
be randomly assigned in equal numbers to each laboratory for
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
thetic Erosion Control.
testing.Theaverageresultsfromthetwolaboratoriesshouldbe
Current edition approved July 10, 2002. Published October 2002.
compared using Student’s t-test for unpaired data and an
Annual Book of ASTM Standards, Vol 07.01.
3 acceptable probability level chosen by the two parties before
Annual Book of ASTM Standards, Vol04.13.
Annual Book of ASTM Standards, Vol 07.02 testing is begun. If bias is found, either its cause must be found
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D6818–02
and corrected, or the purchaser and the supplier must agree to 9.4 Read the breaking force and elongation, from the
interpret future results in the light of the known bias. mechanism provided for such purpose. Record machine and
crossmachinedirectionresultsseparately.Ifdesired,additional
6. Apparatus
points along the stress/strain curve can be recorded as well.
6.1 Tensile Testing Machine, of the Constant Rate of Exten- 9.5 For some machines, data may be obtained using an
sion (CRE) type conforming to Specification D 76, with interfaced computer.
respect to force indication, working range, capacity, and 9.6 If a specimen slips in the jaws, or breaks at the edge of
elongation indicator and designed for operation at a speed of or in the jaws, or if for any reason the results falls markedly
300 6 10 mm/min (12 6 0.5 in./min). below the average of the set of specimens, discard the result
6.2 Clamps and Ja
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