McqMate
| Q. |
Cement is usually a mixture of – |
| A. | Calcium silicate and calcium alurninate |
| B. | Calcium silicate and calcium ferrate |
| C. | Calcium aluminate and calcium ferrate |
| D. | Lime stone and silicon dioxide |
| Answer» A. Calcium silicate and calcium alurninate | |
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Explanation: Portland cement is the most common type of cement in general use around the world because it is a basic ingredient of concrete, mortar, stucco and most non-specialty grout. It usually originates from limestone. It is a fine powder produced by grinding Portland cement. clinker (more than 90%), a limited amount of calcium sulfate (which controls the set time) and up to 5% minor constituents. |
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