Discussion
Consider the following statements about cement raw materials.
1. Limestone typically forms about four fifths of the raw mix.
2. Clay or shale supplies silica and alumina.
3. Gypsum is added to the raw mix before burning.
Answer: D
The first two are correct. The third misplaces the gypsum, which is interground with the cooled clinker after burning, since its purpose is to retard a compound the kiln has already formed and it would decompose at kiln temperatures anyway.
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