Civil Engineering - Building Materials - Discussion

Discussion Forum : Building Materials - Section 5 (Q.No. 9)
The compound of Portland cement which reacts immediately with water and also sets first is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite.
Answer: Option
No answer description is available. Let's discuss.
6 comments Page 1 of 1.

DIPEN TILVA said:   7 years ago
Tricalcium aluminate (C3A) is mostly related to the heat of hydration.

Functions of Dicalcium Silicate:-
1. Hardens slowly.
2. It effects on strength increases occurs at ages beyond one week.
3. Responsible for long-term strength.

Functions of Tricalcium Aluminate:-
1. Contributes to strength development in the first few days because it is the first compound to hydrate.
2. It turns out the higher heat of hydration and contributes to faster gain in strength.

Akki said:   7 years ago
Yes, C3A is the correct answer.

Dhananjay said:   5 years ago
No, the first compound to show the hydration when water is added is C4AF.

Gui said:   5 years ago
Answer is correct as we add gypsum in cement to slow down the reaction of c3A if gypsum is not added then cement would flash set in 5-10 mins.

Nehra said:   3 years ago
Option D is correct it's responsible for flash set.

Irfan ali said:   1 year ago
I think Both option C and D are correct.

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