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Gypsum is added to portland cement to...

Gypsum is added to portland cement to

A

fasten the process of setting

B

slow down the process of setting

C

improve the colour of the cement

D

increase the melting point of cement.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Portland Cement**: Portland cement is a common type of cement used in construction. It is made from a mixture of limestone and clay that is heated to form clinker, which is then ground to a fine powder. 2. **Role of Gypsum**: Gypsum (calcium sulfate dihydrate) is added to Portland cement during the manufacturing process. Its primary role is to control the setting time of the cement. 3. **Setting Time of Cement**: When water is added to cement, it begins to set and harden. If the setting process occurs too quickly, it can lead to incomplete hydration and insufficient strength of the final product. 4. **Effect of Gypsum**: By adding gypsum to Portland cement, the setting time is slowed down. This allows for a more manageable working time and ensures that the cement can achieve sufficient hardness and strength before it sets completely. 5. **Conclusion**: Therefore, gypsum is added to Portland cement to slow down the setting process, allowing the cement to gain adequate hardness. **Final Answer**: Gypsum is added to Portland cement to slow down the process of setting, ensuring that it achieves sufficient hardness. ---
**Step-by-Step Solution:** 1. **Understanding Portland Cement**: Portland cement is a common type of cement used in construction. It is made from a mixture of limestone and clay that is heated to form clinker, which is then ground to a fine powder. 2. **Role of Gypsum**: Gypsum (calcium sulfate dihydrate) is added to Portland cement during the manufacturing process. Its primary role is to control the setting time of the cement. 3. **Setting Time of Cement**: When water is added to cement, it begins to set and harden. If the setting process occurs too quickly, it can lead to incomplete hydration and insufficient strength of the final product. ...
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