Civil Engineering - Building Materials - Discussion

Di-calcium silicate gives progressive strength so how it can give ultimate strength?

C3S hydrates rapidly generating high heat and develops as an early strength however C2S hydrates slowly and takes longer time to gain strength but strength for C3S and C2S will be same. Answer is C3S.

Tricalcium silicate would contribute more in gaining the early and ultimate strength of the concrete then that of dicalcium silicate. So C3S is the answer.

Ultimate strength gain by C3S.

Di-calsium silicate has give a ultimate strength provide.

Add 25% of Di-calcium silicate in cement then it provide ultimate strength.

Tricalcium aluminate responsible for initial setting time.
Tricalcium silicate responsible for initial strength.
Di calcium silicate responsible for ultimate strength.
Tetra calcium alumino ferrite responsible for the flash set.

I think C2S.

Di- Calcium silicate responsible for the lateral strength of cement. C2S.

Tricalcium calcium silicate responsible Early strength of cement. C3S.

As water is added to cement, it hydrates and forms tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite.

Tricalcium silicate forms immediately after hydration and responsible for early strength.

Dicalcium silicate contributes strength by around after 7 days and it is responsible for ultimate strength.

Tricalcium aluminate took months to impart strength after hydration and tetracalcium aluminoferrite took even years. Both are less significant in contributing to strength.