Civil Engineering - Building Materials - Discussion

I think it is Tri calcium silicate.

How long time due to tri-calcium aluminate gains the initial setting by cement?

Silica indicates strength aluminium indicates settings times.

Answer is right, When water is mixed with cement to form a paste, reaction starts. In its pure form, the finely ground cement is extremely sensitive to water. Out of the three main compounds, viz. C3A, C3S, and C2S, reacts quickly with water to produce a jelly-like compound which starts solidifying. The action of changing from a fluid state to a solid state is called 'setting' and should not be confused with 'hardening'.

Answer is wrong C3S (Tricalcium Silicate) is responsible for initial setting and Di Calcium silicate (c2s) contributes strength after 7 days.

Tricalcium silicate responsible for early setting of cement.

Early gain of strength is caused due to tricalcium silicate and thus setting time too.