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Stone columns are one of the most used technologies of soil improvement in Slovakia. An impact of improvement depends on properties of original subsoil as well as properties of coarse - grained materials used for stone columns. Stone columns can be made of pebble gravels, crushed pebble gravels or quarry stones. Two different types (sizes) of quarry stone were used on two different building sites in similar engineering - geological conditions. There wasn?t direct comparison of both materials. The properties of use...