Assessing The Results (Destructive Testing) - Elcometer 506 Guia Del Usuario

7 ASSESSING THE RESULTS (DESTRUCTIVE TESTING)

Once pulled from the surface, examine the bottom of the dolly to assess the results.
a) Successful Test: In most cases the coating will fully adhere to the dolly and the
test can be claimed as 100% valid.
b) Partial Failure: In some cases, the coating will cover only part of the dolly face.
A partial adhesion / coating failure should be recorded if the coating covers more
than 50% of the dolly face.
Cohesive Failure: When the coating fails in the body of the coating layer leaving
some coating on the surface and some coating on the dolly face.
c) Adhesive Failure: If no coating is present on the dolly this must be recorded as a
failure of the adhesive (or glue). This is normally due to incorrect or insufficient
mixing of the component parts of the adhesive, incompatibility of the adhesive
and the coating or the dolly and / or test surface has not been properly prepared
before test - see Section 3 "Securing the Dolly" on page 3
When testing coatings on concrete it is common for the adhesive
bond between the coating and the concrete to exceed the strength
of the concrete itself. In this case concrete will be removed from the
surface and will be seen on the coating on the dolly face.
Observing the test area will give additional information about the
type of failure; adhesion and cohesion between different layers of
the coating.
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a)
b)
c)
Adhesive Partial Coating
Failure Failure
Coating Concrete
Failure Failure
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