Astm D 7005-03(2008)
Wydawnictwo: American Society for Testing Materials
This test method can also be used to verify if the adhesion or bond strength varies after exposure to various incubation media in durability and/or chemical resistance testing.
Whatever use is to be associated with the test, it should be understood that this is an index test.
Note 2—There have been numerous attempts to relate the results of this test to the interface shearing resistance of the respective materials determined per Test Method D 5321. To date, no relationships have been established between the two properties.
Test Method D 7005 for determining the bond strength (ply adhesion) strength may be used as an acceptance test of commercial shipments of geocomposites, but caution is advised since information about between-laboratory precision is incomplete. Comparative tests as directed in 5.4.1 are advisable.
In the case of a dispute arising from differences in reported test results when using the procedure in Test Method D 7005 for acceptance of commercial shipments, the purchaser and the supplier should first confirm that the tests were conducted using comparable test parameters including specimen conditioning, grip faces, grip size, etc. Comparative tests should then be conducted 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 material in question. The test specimens should be randomly assigned to each laboratory for testing. The average results from the two laboratories should be compared to the 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 supplier must agree to interpret future test results in the light of the known bias. Refer to Practice D 2905, Table 1.