Gypsum Dehydration

What are the effects of gypsum dehydration on setting time and physical strength development characteristics of cement mortar?

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Re: Gypsum Dehydration

Gypsum dehydration is necessary for it to become an effective set moderating agent. Gypsum itself is insolouble and therefore cannot moderate the setting of the C3A in cement clinker. For that to happen soluble sulphate must be present. Dehydration of gypsum to hemihydrate renders it soluble.

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