Civil Engineering - Building Materials - Discussion

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.

Initial strength to cement is provided by C3S and later strength is provided by C2S.

So, ultimate strength to cement is provided by both C3S & C2S.

Sabarri: It's not palsticity it's elasticity.

Di-calcium Silicate (C2S): It is responsible for the ultimate strength of concrete. This is also called as Belite.

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.

Plasticity is opposite of elasticity,

Plasticity never regains its original shape after applied load as elasticity do.

Plasticity is a stage between liquid limit and plastic limit of the material.

C3S gives intial strength and C2S give Ultimate strength.

Tri-calcium silicate is response for early developing strength. So, why gives ultimate strength a di-calcium silicate.

Option B is correct answer. Ultimate strength is due to di-calcium. Tri calcium provides initial setting. Then ultimate strength starts.

According to me, option A is correct.