Civil Engineering - Building Materials - Discussion

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.

Option B is correct.

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

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.

@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.

Decreasing order of rate of hydration.

C4AF > C3A > C3S > C2S.

C4AF is the right answer.

According to me, C3A is the correct answer.

Flash set is the property of concrete by which upper surface of concrete become hard without setting the inner portion.