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By Krivenko, P. V.; Roy, D. M.; Shi, Caijun

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A high content of MgO is often detected because refractory material comes into the slag, which also causes soundness problems of steel slag. 7 Relationship between residual lime, precipitated lime and total lime content in steel slag (Wachsmuth et al. 1980). 1995, Geiseler 1996). The Ministry of Transportation of Ontario, Canada, banned the use of steel slag in asphalt concrete on provincial highways in 1993 because of the soundness problem. 5 Cementing properties of steel slag The presence of C3 S, C2 S, C4 AF and C2 F contributes to the cementitious property of steel furnace slag.

Mirabilite was once an item of commerce. Because of its low melting point along with efflorescence when exposed to ambient conditions, sodium sulphate anhydrous is preferred for most applications. However, small quantities of mirabilite are still sold for some special uses. 15 Na2 SO4 – H2 O phase diagram. 4 Applications of sodium sulphate in cement and concrete production Many researches have confirmed that sodium sulphate can be a very effective alkaline activator for portland cement and lime-based cementing materials.

9% of crystallized water and is opaque to colourless. 48 and forms as efflorescent, needlelike monoclinic crystals, but generally is found in the massive form. Mirabilite has a very low melting point of 32 4 C, slightly higher than room temperature. Mirabilite was once an item of commerce. Because of its low melting point along with efflorescence when exposed to ambient conditions, sodium sulphate anhydrous is preferred for most applications. However, small quantities of mirabilite are still sold for some special uses.

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