Abstract
This paper presents the results of testing the adhesion of geopolymer coatings and varnishes with ceramic additives to concrete and steel substrates. The measurement method used and described in this article was the pull-off method. The pull-off method test provides an easy way to evaluate the degree of adhesion of coatings to metal surfaces. The pull-off device provides values for the peel stress, which not only allows a quick determination of the adhesion of the coating to the substrate, but also makes it easier to compare the adhesion of several coatings to each other. However, this method requires appropriate preparation, so an attempt was made to determine its suitability for geopolymer layers. The results of testing the adhesion of a geopolymer layer to a geopolymer substrate and a concrete substrate are presented. As a result of this study, a higher adhesion strength of the geopolymer layer to the geopolymer substrate was found in comparison to geopolymer coatings applied on conventional concrete. Adhesion tests were also conducted for steel substrates to which both geopolymer and acrylic lacquer were applied.
Highlights
The effectiveness of a protective coating, especially its anti-corrosion effect, is strongly dependent on its tightness and the strength of its adhesion to the component
In order to make sure that the paint coating has been applied correctly and its adhesion force to the substrate is sufficient, tests of coating adhesion are carried out using the notch grid method and the peel-off method
This paper presents the results of testing the strength of adhesion of geopolymers applied to steel, conventional concrete and geopolymer
Summary
The effectiveness of a protective coating, especially its anti-corrosion effect, is strongly dependent on its tightness and the strength of its adhesion to the component. In order to make sure that the paint coating has been applied correctly and its adhesion force to the substrate is sufficient, coating adhesion tests are conducted using the notch grid method and the peel-off method The results of these tests enable to evaluate the coating, confirming its proper adhesion and the effectiveness of its operation in the future, or they signal that the given coating is characterized by insufficient adhesion which may lead to its falling off and exposure of the element to harmful factors [1,2,3,4]. The of cohesive fracture, thethe same material is present bothcohesive the surface of the In specimen surface occurs inside the applied coating, it is is on called cohesive fracture.
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