The pull off test is based on a concept that the force required for pulling a metal block, together with a layer of concrete or mortar, from the surface to which it has been attached, is related to the strength of the concrete.
The technique may be applied in two forms:-
- If a block is attached directly to the surface then the stressed volume of concrete lies close to the face of the block.
- Alternatively the test may be carried out by partially coring the concrete and bonding a block of the same nominal diameter to the top of the cylinder of concrete thus isolated.
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