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Why is Gypsum added with clinker during cement production?

added cement clinker gypsum production
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Why is Gypsum added with clinker during cement production?

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The gypsum controls the rate of hydration of the cement in the cement-setting process. Amount corresponding to 1~3 % SO3 is added during cement grinding to retard the setting time. It has favorable affect on strength also. Large quantity leads to slow expansion of cement.

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