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The concrete between the disc and the counterpressure is being compressed (d), hence the pullforce is a direct measure of the compressive strength.

The LOK-TEST Pullout System

A sample pullout LOK-TEST cone, removed for inspection is illustrated in figure (f).

Pulling is done only to failure of the concrete or to a required strength. The disc is usually left in the structure (e) leaving the surface almost undamaged.

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