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Combustion wastes, such as fly ashes and slags, can be recycled primarily by using them in road construction. Nonetheless, their potential negative impact on the environment cannot be omitted. In practice, a number of methods are used for the leaching characterization of wastes, including the standards of the European and US Environmental Protection Agencies. The studies, the results of which are presented in this article, were performed for fly ashes and slags from coal combustion and for fly ashes from combustio...