Question

Mention the function of gypsum in cement manufacturing process.​

Answer 1

Explanation:

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The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water.

The process involved in hydration of cement is that, when the water is added into cement, it starts reacting with the C3A and hardens. The time taken in this process is very less, which doesn’t allow time for transporting, mixing and placing.

When gypsum is added into the cement and water is added to it, reaction with C3A particles tales place to form ettringite. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles .These crystals are too small to bridge the gaps between the particles of cement. The cement mix therefore remains plastic and workable.

The time allowed for mixing, transporting and placing plays a important role in strength, composition and workabilty of concrete. As gypsum retards the process of hydration, it is termed as retarding agent of cement.

Answer 2

Explanation:

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The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water.

The process involved in hydration of cement is that, when the water is added into cement, it starts reacting with the C3A and hardens. The time taken in this process is very less, which doesn’t allow time for transporting, mixing and placing.

When gypsum is added into the cement and water is added to it, reaction with C3A particles tales place to form ettringite. This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles .These crystals are too small to bridge the gaps between the particles of cement. The cement mix therefore remains plastic and workable.

The time allowed for mixing, transporting and placing plays a important role in strength, composition and workabilty of concrete. As gypsum retards the process of hydration, it is termed as retarding agent of cement.