|Description / Abstract
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|This test method covers procedures for evaluating the pull-off
adhesion strength of a coating on concrete. The test determines the
greatest perpendicular force (in tension) that a surface area can
bear before a plug of material is detached. Failure will occur
along the weakest plane within the system comprised of the test
fixture, adhesive, coating system, and substrate, and will be
exposed by the fracture surface.
This test method uses a class of apparatus known as portable
pull-off adhesion testers.2 They are capable of applying
a concentric load and counter load to a single surface so that
coatings can be tested even though only one side is accessible.
Measurements are limited by the strength of adhesion bonds between
the loading fixture, coating system and the substrate or the
cohesive strengths of the adhesive, coating layers, and
Pull-off adhesion strength measurements depend upon both
material and instrumental parameters. There are different
instruments used that comply with this test method. The specific
instrument used should be identified when reporting results. This
test is destructive and spot repairs may be necessary.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
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.
2 The term adhesion tester may be somewhat of a
misnomer, but its adoption by two manufacturers and at least two
patents indicates continued usage.
|Additional Supplemental Documents