Ettringite Formation and the Performance of Concrete - The Portland .gypsum, are intentionally added to portland cement to regulate early hydration . expansion in the specimens resulted from frost damage and not from recrystallization of . and react soon after cement comes into contact with mix water. However .. added to cement during final grinding, slows down the initial hydration rate.what happens when gypsum is not added during grindin,What is the role of gypsum in cement? - QuoraDec 1, 2017 . Gypsum is a mineral and is hydrated calcium sulfate in chemical form. . a small amount of gypsum is introduced during the final grinding process. . If not added, the cement will set immediately after mixing of water leaving no time for concrete placing. . When water is added to the cement,hydration reaction takes place.
what happens when gypsum is not added during grindin