Question

The ratio of percentage of alumina to iron oxide in OPC 43 grade is:

(a) 3.5

(b) 0.66

(c) 0.1

(d) 0.05

I had been asked this question during an interview for a job.

I would like to ask this question from Grades of Cement topic in chapter Materials for Construction of Basic Civil Engineering

Answer 1

Correct option is (b) 0.66

Explanation: It is mentioned in IS 8112:2013 Table 2.  3.5 is the total sulphur content, 0.1 is chloride content and 0.05 is alkali content.