1.

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

Answer» 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.


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