The composition of mixture of clay and lime stone in the raw for cement material is __________________?
Correct answer: A. 75% lime stone and 25% clay
- A. 75% lime stone and 25% clay
- B. 25% lime stone and 75% clay
- C. 15% lime stone and 55% clay
- D. 55% lime stone and 15% clay
Explanation
The usual cement raw mix contains approximately 75% calcareous material, mainly limestone, and 25% argillaceous material, mainly clay. Hence the stated composition is 75% limestone and 25% clay. Students may choose b by reversing the roles, although limestone is the major component because calcium compounds form most of the cement.
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