POTENTIAL OF SELECTED INDUSTRIAL WASTES IN CIVIL ENGINEERING APPLICATIONS.

In this paper, the utilization of coal fly ash 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 fly 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 tested in compression strength. According to the standard requirements of STN EN 206, the highest values of 28 and 90-days compressive strengths of samples based on mechano-chemical treatment of coal fly ash and samples prepared with glass bottle fragment, both correspond to the concrete of strength class of C 25/30. Experiments show that selected treatment method - mechano-chemical activation - of coal fly ash has a positive influence on compressive strength development of the tested samples. The results from bottle glass waste application show that glass waste used as an aggregate in concrete has not negative effects on the strength characteristics of hardened concrete, but have positive effects for fair-faced concrete surfaces requirements. [ABSTRACT FROM AUTHOR]