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What is ettringite in cement?

Asked By: Saanvi Trivedi

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Pharmacist Ibm Change Management Bangalore India

Ettringite is a primary constituent of hydration of Portland cement concrete. Ettringite is the mineral name for calcium sulfoaluminate (3CaO•Al2O3•3CaSO4•32H2O), which is normally found in portland cement concretes. Ettringite is normally one of the earliest phases formed during cement hydration. In concrete chemistry ettringite is a hexacalcium aluminate. One of the first new crystal structures to form is ettringite; it forms almost instantly when water is added to portland cement. Ettringite or hydrated calcium aluminum sulfate hydroxide is formed by the reaction between sulfate ions and the aluminate phases in cement.


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