Miscellaneous Cement Types

So-called sorel cement is not a cement in the true sense of the word. Mixtures of caustic burnt magnesite (reactive MgO, produced by heating magnesium carbonate just above its decomposition temperature) and magnesium salts harden into a stone-like mass. Sorel cement is obtained by reacting magnesium oxide with concentrated magnesium chloride solution  

Magnesia cement exhibits, even when dry, a considerable electrical conductivity. As a result flooring produced from it does not exhibit static charging. 

Magnesium sulfate also forms a stonc-like mass with magnesium oxide, which is used for the manufacture of lightweight boarding (Heraklith ). 

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Miscellaneous Cements. Butyl and polyisobutylene are used in a range of cements. Several specific types shown in Table 2 illustrate their use. All concentrations in formulations in this chapter are expressed in parts by weight. 

In 1989, 4,689,000 metric tons of uncalcined gypsum was sold or used 3,229,000 metric tons for use in Pordand cement and the remainder for agriculture and miscellaneous uses. About 17,778,000 metric tons of calcined material was used to produce 1.9 million square meters of board products. Over one million square meters of this material was regular board and about 560,000 m was Type X board. 

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