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The paper presents the research on the use of a waste material (a recycled powder) which partially replaces cement in fine-grained concretes. The powder was obtained in the thermo-mechanical treatment of concrete rubble, which this article describes. Roasting made a cement paste partially dehydrated and consequently activated the cementпїЅs binding capacity. The recycled powder was tested in terms of a sieve analysis, the Blaine surface area method, density and a thermal analysis. Then the statistical experiment c...