Option 1: Decrease the rate of setting of cement

Gypsum is added to clinker during cement manufacturing to decrease the rate of setting of cement. Setting is the process by which cement hardens and gains its strength. When water is mixed with cement, it forms a paste that gradually solidifies and hardens over time. However, if the cement sets too quickly, it can be difficult to work with and may not have sufficient time to properly bond and develop its strength. By adding gypsum to the clinker, the rate of setting of cement is slowed down, allowing for a more manageable working time and ensuring that the cement has enough time to develop its desired strength.

Option 2: Bind the particles of calcium silicate

This option is not directly related to the specific role of gypsum in cement manufacturing. The binding of particles in cement primarily occurs through chemical reactions and the formation of hydration products, rather than the presence of gypsum.

Option 3: Facilitate the formation of colloidal gel

This option is not accurate. Gypsum does not facilitate the formation of colloidal gel in cement manufacturing. The role of gypsum is mainly related to the rate of setting and the development of strength in the cement.

Option 4: Impart strength to cement

This