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The disposal of the fly ash generated in coal based power-plants may pose a  significant risk to the environment due to the possible leaching of hazardous  pollutants, such as toxic metals. Also, there is a risk of leaching even when  fly ash is built-in the construction composites. Fly ashes from various  landfills were applied in several composite samples (mortar, concrete and  brick) without any physical or thermal pre-treatment. The leachability of the  potentially toxic pollutants from the fly ash based products was  investigated. The leaching behavior and potential environmental impact of the  11 potentially hazardous elements was tracked: Pb, Cd, Zn, Cu, Ni, Cr, Hg,  As, Ba, Sb and Se. A detailed study of physico-chemical characteristics of  the fly ash, with accent on trace elements and the chemical composition  investigation is included. Physico/chemical properties of fly ash were  investigated by means of X-ray fluorescence, differential thermal analysis  and X-ray diffraction methods. Scanning electron microscope was used in  microstructural analysis. The results show that most of the elements are more  easily leachable from the fly ash in comparison with the fly ash based  composites. The leaching of investigated pollutants is within allowed range  thus investigated fly ashes can be reused in construction materials  production

Leaching of the potentially toxic pollutants from composites based on waste raw material