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in The s Block Elements by (35.1k points)
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Cement is a complex mixture of silicates and aluminates. 

1. What is the function of gypsum in cement? 

2. Explain setting of cement.

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1. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened. 

2. When the cement is mixed with water, it forms a gelatinous mass which sets slowly to a hard mass having 3 dimensional network structure with -Si- O-Si and -Si-OAI- chains. This is an exothermic process and is called setting of cement.

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