Gypsum
Summary
Gypsum - is a sulphate mineral which is added to the clinker during grinding in the production of Portland cement. It is composed of hydrated calcium sulphate.
Technical Information
The main function of gypsum in Portland cement is to control the rate of hydration and prevent flash setting. Without the addition of gypsum, the cement would harden too quickly. It does not contribute to the strength of the concrete.
Because gypsum is a source of sulphate, excessive amounts of it in a cement mix can lead to a higher risk of internal chemical attacks such as delayed ettringite formation.
Related Definitions
Clinker , Pulverised Fuel Ash (PFA) , Sulphate Attack , False Set , PasteResources
What is the purpose of adding gypsum in cement? - www.engineeringcivil.comPaper with a section on the use of gypsum in Portland cement - https://ir.uiowa.edu
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