Civil Engineering - Building Materials - Discussion

Quick-setting cement is a type of cement that sets rapidly after being mixed with water. It is used in situations where a fast setting is required, such as underwater construction or in emergency repair works.

Aluminium sulphate is added to the cement in a very fine powdered form. It accelerates the hydration process, making the cement set quickly.

Gypsum is usually added to slow down the setting time of cement, so reducing or increasing gypsum does not produce quick-setting cement.

Pozzolana is used in making pozzolanic cement, which is different from quick-setting cement.

Gypsum retard the initial setting time, therefore we should add in less amount.

So, option A is the correct answer.

Yes, A is the appropriate answer.

It is for rapid hardening cement. But for quick setting cement, it is option C.

Gypsum is retarder. It delays the setting time.

I think A is the right answer. Or one can add calcium chloride as an accelerator.

I think answer A & C both are correct because gypsum is mainly increase setting time but here it said less amount of gypsum and aluminium sulphate is accelerate setting so both answer A & C is correct.

@Srinivas.

Plasticizers - 1%
Calcium chloride - 2%
Gypsum - 0.5%

Option C is correct.

C -, cz gypsum is retardar, which mean increase setting time,

But here asked about the quick setting, i.e accelerator, mean decrease setting time which is aluminium sapphire (Al2So4).