Civil Engineering - Building Materials - Discussion

2. 

Initial setting of cement is caused due to

[A]. Tri-calcium silicate
[B]. Di-calcium silicate
[C]. Tri-calcium aluminate
[D]. Tetra calcium alumino ferrite.

Answer: Option C

Explanation:

No answer description available for this question.

Prithvi said: (May 30, 2014)  
Early gain of strength is caused due to tricalcium silicate and thus setting time too.

Vikas said: (Feb 19, 2016)  
Tricalcium silicate responsible for early setting of cement.

Sonu said: (Jul 29, 2016)  
Answer is wrong C3S (Tricalcium Silicate) is responsible for initial setting and Di Calcium silicate (c2s) contributes strength after 7 days.

Sohan Jangra said: (Sep 29, 2016)  
Answer is right, When water is mixed with cement to form a paste, reaction starts. In its pure form, the finely ground cement is extremely sensitive to water. Out of the three main compounds, viz. C3A, C3S, and C2S, reacts quickly with water to produce a jelly-like compound which starts solidifying. The action of changing from a fluid state to a solid state is called 'setting' and should not be confused with 'hardening'.

Devaraj said: (Dec 31, 2016)  
Silica indicates strength aluminium indicates settings times.

Laxman Prasad said: (Mar 8, 2017)  
How long time due to tri-calcium aluminate gains the initial setting by cement?

Chandrima said: (Apr 22, 2017)  
I think it is Tri calcium silicate.

Amitkumarsachin said: (Jul 1, 2017)  
C3S is responsible to early strength not early setting time, C3A is responsiblefor early setting time.

Ramavtar said: (Dec 13, 2017)  
C3S is correct.

Shekhar Kumar said: (Jan 27, 2018)  
Properties of cement compounds These compounds contribute to the properties of cement in different ways

Tricalcium silicate, C3S:- This compound hydrates and hardens rapidly. It is largely responsible for portland cement's initial set and early strength gain.

Dicalcium silicate, C2S:- C2S hydrates and hardens slowly. It is largely responsible for strength gain after one week.

Tricalcium aluminate, C3A:- It liberates a lot of heat during the early stages of hydration, but has little strength contribution. Gypsum slows down the hydration rate of C3A. Cement low in C3A is sulphate resistant.

Tetracalcium alumino Ferrite, C4AF:- This is a fluxing agent which reduces the melting temperature of the raw materials in the kiln (from 1650o C to 1450o C). It hydrates rapidly but does not contribute much to the strength of the cement paste. By mixing these compounds appropriately, manufacturers can produce different types of cement to suit several construction environments.

Rabindra said: (Apr 10, 2018)  
The Answer is right because it is asking the for the early setting time of cement which is due to tricalcium aluminate but for the early strength of cement, tricalcium silicate and ultimate strength or final strength is due to dicalcium silicate. So don't be confused be clear.

Basavaraj said: (Aug 21, 2018)  
C3S for initial setting.
C3A for the flash setting.
C2s for Ultimate strength.

Abhishek Yadgiri Mudiraj said: (Sep 19, 2018)  
C3S and C2S for strength and C3A for the early setting of cement.

Sunil Kumawat said: (Oct 31, 2018)  
C3A is responsible for both flash and initial setting time.

Muttu said: (Apr 29, 2019)  
Option A is the correct answer.

Opsc Aee said: (Oct 29, 2019)  
Give ans is right.

Here asked about initial setting, not asked speeds the setting. Kindly read the que again.

Aditya said: (Jan 30, 2020)  
The setting and hardenings of cement paste is mainly due to the hydration and hydrolysis.

Dharanidharan said: (Feb 21, 2020)  
Answer C is correct.

Be because.

C3s strenth property.

C3a time &hydration property.

Nitesh said: (Mar 9, 2020)  
Hello guys, the answer is right, because C2S is responsible for early STRENGTH of cement in the INITIAL stage, in this question ask the initial setting time of cement.

Joey said: (Jun 15, 2020)  
C3S - early strength.
C2S - ultimate strength.
C3A - the initial setting of cement.

Heat of hydration C3A > C3S > C4AF > C2S.

Sushant Kumar Sahu said: (Jul 29, 2020)  
When water is added in cement, first tricalcium aluminate is reacted with water and it is responsible for initial setting of cement.

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