Q. The main constituent of ordinary portland cement is-

A
Silica
B
Lime
C
Alumina
D
Iron oxide
Solution:

The composition of raw materials in portland cement are as follows
Lime 60-65%
Silica 17-25%
Alumina 3-8%
Iron oxides 0.5-6%
Also trace amount of magnesia,soda, potash and sulphur trioxide

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