Civil Engineering - Building Materials - Discussion

Yes, the sequence of the rate of hydration and heat of hydration for the four main constituents of cement is C3A > C3S > C4AF > C2S.

Rate of hydration:
The rate of hydration for the four constituents of cement is C3A > C4AF > C3S > C2S. C3S reacts more than five times faster than C2S.

Heat of hydration:
The heat of hydration for the four constituents of cement is C3A > C3S > C4AF > C2S. The heat of hydration for each compound is:
C3A: 867 J/kg
C3S: 502 J/kg
C4AF: 419 J/kg
C2S: 260 J/kg
The main cement constituent, C3S, contributes the most to the early strength of Portland cement, while C2S contributes the most to its long-term strength.

According to me, C3A is the correct answer.

@Aman.

It is C4AF.

The first compound to be formed in the manufacturing of cement is?

Can anyone answer this?

Rate of Hydration C4AF>C3A.

So, option B is the correct answer.

Option B is correct.

The Rate of hydration C4AF>C3A>C3S>C2S.
The Heat of hydration C3A>C3S>C4AF>C2S.

Decreasing order of rate of hydration.

C4AF > C3A > C3S > C2S.

Cement has 4 compounds which are known as Bogue compound.

1. Tricalcium silicate: It gives early strength.
2. Dicalcium silicate: It gives ultimate strength.
It also decreases the heat of hydration.

3. Tricalcium Aluminate:it rapidly reacts with.
Water. It is also responsible for the initial setting. It has a high heat of hydration.

4: Tetracalcium Amino Ferrite: It produces less heat. If increase the content reduce the strength slightly.

Cement has 4 component.

1. C3S it is quickly hydrated and a short time in give strength.
2. C2s it is a set time long periods and alternative setting time.
3. C3af training Calcium Alumino-ferrite.

C4AF is the right answer.