.

Likewise, what are the factors affecting the setting time of cement?

The major factors affecting the time ofsetting are cement composition, water-cementitiousmaterial ratio (w/cm), temperature, and admixtures. Whencement hydrates faster, the time of setting isreduced.

Furthermore, why gypsum is added during the setting of cement? Gypsum plays a very important role incontrolling the rate of hardening of the cement.During the cement manufacturing process, upon thecooling of clinker, a small amount of gypsum is introducedduring the final grinding process. Gypsum is added tocontrol the “setting of cement”.

Also to know is, what is added to delay the setting of cement?

A delay in the setting of cement paste canbe achieved by adding a retarder to the concrete mix.Retarders generally slow down the hardening of the cementpaste by stopping the rapid set shown by tricalcium aluminates butdo not alter the composition of hydration products (Neville andBrooks, 2006; Lea, 1988).

How Gypsum affect the setting time of cement?

When the gypsum is added in the correct amount(typically 5% by weight of cement), it is most emphaticallynot going to lower the setting time. It should increase it.Or it was not added to Portland cement. That is simply wherethe gypsum itself acts as a binder.