Effect of White vitriol (Zinc sulphate) on bonding characteristics of Magnesium oxysulphate cement

Sorel S.T., a French Scientist discovered a non calcareous Magnesium Oxysulphate cement in 1867 which showed cementing characteristics and was even superior than calcareous Portland cement. It is prepared by the combination of magnesium sulphate solution with magnesium oxide. Inert filler dolomite is also added in the matrix to absorb the excess heat evolved during the exothermic formation of the cement, which reduces thermal shocks. Additives may alter the properties of the cement. Mixing of Zinc sulphate (white vitriol) in Magnesium Oxysulphate cement (Sorel’s cement) as an additive shows very encouraging results. Remarkable increase in strength and watertightness of the cement is noticed with increasing quantities of the additive alongwith moderation in its setting. Weathering effects also reveal favourable findings. No significant volume changes are noticed on mixing the additive in the matrix

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