The article presents results of examining of hydraulic properties of ladle slags formed during production of steel.The studied ladle slags were subjected to different cooling mode from the molten state. Based on the ability of theslag react with the water was assessed their hydraulic activity. The hydraulic properties are caused by the presenceof minerals dicalcium silicate, tricalcium aluminate, mayenite, brownmillerite and dicalcium ferite. The emergenceof required hydrating phases in the ladle slags is conditioned by a sufficient CaO content and their cooling rate. Thecontact the slag with water during processing and their ageing has a negative effect. The experiment has shownthat the phase transformation of the mineral dicalcium silicate which occurs during cooling of the ladle slags causetheir volume instability.
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