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Amorphous Calcium Aluminate Cement (ACA) is on of the latest developments in cement chemistry. There is not a lot published on this subject so therefor this blog. Main phase is C12A7 (mayenite) a most reactive phase in cement hydration. Amorphous calcium aluminate can be used as an additive in cementitious compositions as an accelerating agent to Portlandcement.Other features are rapid drying and compensation of shrinkage through positive expansion.Read less