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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...

In this paper, the utilization of coal fly as h and bottle glass waste in building industry is described. In the first step of our experiment we made concrete samples with partial replacement of cement by activated coal fl y ash from Slovakian power plant Novaky. The second part of our study is focused on utilization of selected fractions of bottle glass waste in concrete production. From all mixtures, samples with dimension 160x40x40 mm were made in our case study. After 28 and 90 days of hardening, samples were ...