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This paper is focused on the reuse of construction and demolition wastes in concrete production. From a large group of demolition wastes the concrete waste was selected. Tested concrete samples were prepared using coarse recycled concrete aggregate. In these specimens, fraction 4/8 mm were replaced by recycled concrete aggregate with a range of 100%. To reduce the absorption of the recycled concrete aggregate, the surface of aggregate was activated by a multi-stage mixing and using of geopolymer phases. To prepara...