ASTM D7234-19 PDF Download

ASTM D7234-19 is a standard test method that provides procedures for evaluating the pull-off adhesion strength of a coating on concrete. The purpose of this test is to determine the maximum perpendicular force that a surface area can bear before the coating is detached. The test is conducted using portable pull-off adhesion testers, which apply a concentric load and counter load to the surface. This allows for testing even when only one side of the coating is accessible.

It is important to note that variations in strength results may occur when using different instruments, substrates, or loading fixtures with the same coating. Therefore, it is recommended to agree upon the specific test instrument and loading fixture between the interested parties.

This test method should not be used to determine the surface strength of uncoated concrete. There is a separate test method, designated as Test Method C1583, which is suitable for that determination.

It is also emphasized that pull-off adhesion strength measurements depend on both material and instrumental parameters. Different instruments that comply with this test method may be used. The specific instrument used should be identified when reporting the results. It is worth mentioning that this test is destructive, and spot repairs may be necessary after conducting the test.