64.
Which of the following is the main ingredient of cement?
A.
Limestone
B. Silica Clay
C.
Gypsum
D. Ash
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Answer:
Limestone
Explanation:
Limestone is the most common form of calcium carbonate which is used extensively for the manufacture of cement. Cements in different types are made mainly by calcining a mixture of about 75% limestone and 25% clay to form a calcium silicate clinker which is then ground and mixed with a small amount of gypsum
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