Universal testing machine Puncture Strength of Geotextiles ASTM
1.1 This test method is an index test used to measure the force
required to puncture a geotextile and geotextile-related products.
The relatively large size of the plunger provides a
multidirectional force on the geotextile.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information only.
1.3 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.
4. Summary of Test Method
4.1 A test specimen is clamped without tension between circular
plates and secured in a tensile or compression testing machine, or
both. A force is exerted against the center of the unsupported
portion of the test specimen by a steel plunger attached to the
load indicator until rupture occurs. The maximum force is the value
of puncture strength.
5. Significance and Use
5.1 This test method for determining the puncture strength of
geotextiles is to be used by the industry as an index of puncture
strength. The use of this test method is to establish an index
value by providing standard criteria and a basis for uniform
5.2 This test method is considered satisfactory for acceptance
testing of commercial shipments of geotextiles.
5.3 In case of a dispute arising from differences in reported test
results 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 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 that are as
homogeneous as possible and that are from a lot of the type in
question. The test specimens then should 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 is
begun. If a bias is found, either its cause must be found and
corrected, or the purchaser and the supplier must agree to
interpret future test results in the light of the known bias.
5.4 This test method is not applicable to materials that are
manufactured in sizes that are too small to be placed into the test
apparatus in accordance with the procedures in this test method.
Furthermore, it is not appropriate to separate plies of a
geosynthetic or geocomposite for use in this test method.
|Load Accuracy||Better than ±1% of reading|
|Load Resolution||1/500000 of capacity, stepless|
|Extension Measurement Range||0.02%-100%FS|
|Extension Measurement Accuracy||Better than ±1% of reading|
|Extension Resolution||1/500000 of capacity|
|Displacement Measurement Accuracy||Better than ±1% of reading|
|Speed Accuracy||Better than ±1% of setting speed|
|Max. Test Speed||500mm/min|
|Min. Test Speed||0.001mm/min|
|Crosshead Speed Accuracy|
.01mm/min, better than ±0.2% of setting
|Total Crosshead Travel (without grips)||1100mm|
|Effective Test Width||420mm|
|Power Supply||Single phase 220V±10%, 50Hz|