Rebound hammers complying with the specifications of ČSN EN 12504-2 resp. ČSN 73 1373 is used primarily for the determination of compressive strength of concrete in the structure. The paper presents the knowledge of the use of mechanical rebound hammer with impact energy of 0.735 N.m (type L) for the determination of compressive strength and tensile bending of calcium silicate bricks 290 × 140 × 65 mm. Calibration relationships for compression and tensile strength bending from the rebound number are presented. In practice, the calibration relationship for compressive strength prediction is applicable, the relationship for tensile bending strength does not show sufficient tightness between the variables and can only be used provided that a refinement coefficient is defined in the sense of ČSN 73 1370.
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