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Question

Which of the following is/are the raw materials used to manufacture cement?

A
Clay
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B
Limestone
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C
Calcium sulphate
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D
Slaked lime
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Solution

The correct options are
A Clay
B Limestone

The most common raw rock types used in cement production are:

  1. Limestone (supplies the bulk of the lime)
  2. Clay, marl or shale (supplies the bulk of the silica, alumina and ferric oxide)
  3. Other supplementary materials such as sand, fly ash/pulverised fuel ash (PFA), or ironstone to achieve the desired bulk composition


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