Slags with granulation 0-10 mm or 10-20 mm were sep. used as additives (20-75% by mass) for the prodn. of concrete. D., compressive strength as well as absorbability of the concrete samples were detd. The increase in a content of the additive resulted in redo. of d. and compressive strength of the tested concrete as well as in increasing its absorbability. Any impact of the slag granulation on the tested concrete parameters was not obsd.