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For a cement of good quality, what should be the approximate ratios of the following? I. Silica to alumina II. CaO to the combined oxides of SiO2, Al2O3 and Fe2O3

1. I = 2.5 to 4, II = greater than 2
2. I = nearly 4, II = less than 2
3. I = 2.5, II = close to 2
4. I = 2.5 to 4, II = close to 2

Correct answer: I = 2.5 to 4, II = close to 2

Solution

The correct option indicates that a good quality cement should have a silica to alumina ratio between 2.5 and 4, which ensures proper strength and durability, while the calcium oxide to the combined oxides ratio being close to 2 supports optimal chemical reactions during hydration.

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