Question

Approximate percentage range of A2O3 in OPC is _______

(a) 17-25

(b) 3-8

(c) 3- 10

(d) 4-15

This question was addressed to me during an interview.

My query is from Process of Manufacture of Fresh Concrete in division Fresh Concrete of Concrete Technology

Answer 1

Right answer is (c) 3- 10

For explanation I would say: Percentage of A2O3 is 3-8, CaO has 60-67, SiO2 has 17-25, SO3 is 1-3, MgO has .1-4 and soda has .5-1.3.