Concrete and cement I Give an example of noncalcium silicate

Concrete and cement:

I) Give an example of non-calcium silicate cement

II) Can Portland cement hydrate without exposure to air?

Solution

(i)Answer:- Example for non calcium silicate cement is High alumina cement or cement fondu.

The principal compound of cement fondu is mono calcium aluminate.

(ii)Answer:- Yes cement can hydrate without exposure to air.

2Ca₃SiO₅ + 7 H₂O = 3 CaO.2SiO₂.4H₂O + 3 Ca(OH)₂