Which among the following are essential constituents of Portland cement?
- A. Sand, lime, clay
- B. Silica, alumina, lime ✓
- C. Silica, lime, graphite powder
- D. Sand, graphene, clay
Correct Answer: B. Silica, alumina, lime
Explanation
The essential chemical constituents of Portland cement are calcium oxide (lime), silicon dioxide (silica), and aluminum oxide (alumina).
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