R
6
2.4 ASSESSMENT OF RESULTS
To record the result, first inspect the face of the dolly. In most cases the coating will fully adhere to the dolly
and the test can be claimed as 100% valid. In some cases, the coating will cover only part of the area of the
dolly and a partial adhesion failure should be recorded.
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 incorrect ambient conditions.
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 or concrete.
3 ADHESIVES
3.1 ARALDITE
The adhesive supplied with the Elcometer 106 Scale 6 is Araldite, a two-pack epoxy paste which is mixed
from approximately equal volumes of the two components. Measurement by eye is sufficient. When mixed
it should be used within one hour.
Curing Times:
•
24 hours at 25°C
•
3 hours at 60°C
