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Pull off adhesion test : choice and influence of the diameter of the dolly

Pull off adhesion test : choice and influence of the diameter of the dolly

Pull off adhesion test : choice and influence of the diameter of the dolly

(OP)
Hello,

I am a french material engineer.

I want to carry out pull out tests on coatings applied on steel surface and concrete surface.

So my questions are :

- Do you know why the diameter of the dolly is different between concrete surface (50 mm) and steel surface (20 mm or < 20 mm)?

- Is there an influence of the diameter of the dolly on pull out test results ?

Thanks for your answers

RE: Pull off adhesion test : choice and influence of the diameter of the dolly

Je suis désole double signalisation n’est pas autorisée
B.E.

You are judged not by what you know, but by what you can do.

RE: Pull off adhesion test : choice and influence of the diameter of the dolly

The concrete substrate is more heterogeneous. Lots of concrete has aggregate larger than 20mm. Using a larger dolly means a more "representative" answer.

RE: Pull off adhesion test : choice and influence of the diameter of the dolly

One more reason: Instrument limits.

The ultimate potential strength of a pulloff on concrete is much lower than on steel. I have seen steel pulloffs at 5000 PSI. Rarely would you see concrete pulloffs of 500 PSI.

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