Reactivity of lime and related oxides. XII. Hydration of dolomitic lime

Dolomitic lime samples differing widely in surface activity (specific surface, 5–65 m.2g.−1) have been ‘dry’ hydrated by exposure to water vapour at 22° and ‘wet’ hydrated by liquid water at 22° and 95°. In general, the calcium oxide hydrates much more rapidly than the magnesium oxide in the dolimes. During the ‘dry’ hydration of dolime, the calcium hydroxide impedes subsequent hydration of the magnesium oxide. In the ‘wet’ hydrations, changes in surface area and crystal structure resemble those during the separate hydration of lime and magnesia.