Abstract
Waste from energy or mining has been widely used in civil engineering for many years, ie in road engineering, construction, land reclamation as well as in mining. The most frequently performed technologies in underground mining with fine-fraction waste are the sealing of infarcted grouting of cavings and liquidation. In these technologies, transport and migration properties play a primary role. They depend on the type of fly ash. At present, in Polish hard coal mines located in Upper Silesia, most commonly used technologies are ashes with code 10 01 02 from conventional boilers, and as second ashes from code 10 02 82 from fluidized bed boilers. The article presents the results of research on selected physical properties of ash-water mixtures such as: water-ash index (W/FA), leveling, density and volume of excess water. Furthermore, for the tested ashes, the volume of water was determined, which can be utilized in the case of the technologies described above, and it will constitute an added value.
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