Abstract
This paper investigated the hydration properties of steel slag under autoclaved condition (216 °C and 2 MPa). The results show that under autoclaved condition, besides C2S and C3S, f-CaO and the minerals containing MgO can react sufficiently. The morphologies of Ca(OH)2 produced by f-CaO are quite different from those produced by C2S and C3S. The Ca(OH)2 produced by f-CaO has a larger specific surface area or volume than that produced by C2S and C3S. The mean Ca–Si ratio of the C–S–H gel produced by steel slag is between 1.7 and 1.9, which is a little smaller than that produced by cement. The reaction of f-CaO tends to cause greater expansion than that of the minerals containing MgO.
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