The energy yield of the acoustic and electromagnetic emissions (AE and EME, respectively) induced by the microcracking and distortion of the structure of cement stone CK M400 under a localized impact was evaluated. The experiments were conducted with samples both with dry and wet surfaces. The impact induced sweeps of AE and EME were associated with various processes of the material transformation, as follows the microplastic transformation of a material; the piezoeffect; the shift of double electric layers between grain boundaries and binder; the same, that is concerns the internal surface of natural (technological) microcavities in a cement stone; the static drain and annihilation of charges from collapsed grain walls following the passage of the shock wave. Keywords: cement stone, surface, impact damage, acoustic emission, electromagnetic emissoion.

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