Civil Engineering - Building Materials - Discussion

22. 

Quick setting cement is produced by adding

[A]. less amount of gypsum in very fine powdered form
[B]. more amount of gypsum in very fine powdered form
[C]. aluminium sulphate in very fine powdered form
[D]. pozzolana in very fine powdered form
[E]. none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Ankit Bhadola said: (Aug 22, 2015)  
Answer is C.

Quick Setting Cement as the name indicates, these types of cements are used where quick setting is needed. The quick setting cement is manufactured by adding a small percentage of aluminum sulphate and then it is finely grinded with cement.

And also for quick setting action a small percentage of gypsum or retarder is added. The aluminum sulphate is mainly added to accelerate the setting time fast.

Srinivas said: (Oct 14, 2015)  
For normal cement gypsum add 2% which causes increasing setting time.

Bishal said: (Oct 21, 2016)  
The answer will be option A. Because gypsum is such a chemical compound which is liable for the setting of cement.

Ranjan said: (Jan 29, 2017)  
I think the option will be both A and C.

Ajay said: (Jul 20, 2017)  
Gypsum is an retarder not accelerater.

Ravinder Poonia said: (Sep 6, 2017)  
The Correct answer is A Because gypsum is such a chemical compound which is liable for the setting of cement.

Lal Bahadur Bairwa said: (Nov 18, 2017)  
Answer is A and C because gypsum is retarded setting time and aluminum sulphate is produced quick setting but best answer is C.

Manish Goley said: (Jan 2, 2018)  
I think it is both A and C.

Mahboob Ali said: (Apr 19, 2018)  
Option C is CORRECT.

Because quick setting cement mainly produced by adding a small amount of ALSO4 and fine grinding other than RHS OR OPC. And reduced CASO4 (GYPSUM).

Rabindra said: (Apr 30, 2018)  
Nice @Ankit.

Bhaskar said: (Sep 24, 2018)  
C is the appropriate answer. I agree with the given answer.

Saddam Hussain said: (Dec 21, 2018)  
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).

Sharath T Raj said: (Feb 1, 2019)  
Option C is correct.

Opsc Aee said: (Oct 29, 2019)  
@Srinivas.

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

Shashwat Singh said: (Nov 23, 2019)  
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.

Som Nath said: (Jan 17, 2020)  
I think A is the right answer. Or one can add calcium chloride as an accelerator.

Alee said: (Feb 27, 2020)  
Gypsum is retarder. It delays the setting time.

Himanshu Gupta said: (Apr 8, 2020)  
It is for rapid hardening cement. But for quick setting cement, it is option C.

Arsh Afroz said: (Sep 13, 2020)  
Yes, A is the appropriate answer.

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