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Question

The main raw materials required for the manufacture of portland cement are:

A
limestone and clay
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B
limestone and gpsum
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C
limestone and calcium chloride
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D
limestone and silica
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Solution

The correct option is A limestone and clay
It consists of calcium silicates and the ratio of calcium oxide to silicon dioxide is not less than 2. It consists of MgO not more than 5% by mass.

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