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Extracting samples in order to observe the interior of the elements and perform mechanical tests on the samples is an slightly destructive method that permits an evaluation of the compactness of the elements and determination of the mechanical properties of the materials, such as compressive strength and modulus of elasticity.

Samples are extracted using core drills equipped with diamond crowns, using water as a lubricant. The collected samples must be rectified and prepared in a laboratory before being tested.