Discussion
Consider the following statements about cement.
1. Gypsum is added to retard setting 2. Tricalcium silicate gives the later strength 3. Cement sets by hydration rather than by drying
Answer: D
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: gypsum retards the flash set caused by tricalcium aluminate, and cement sets by hydration rather than by drying, which is why it hardens under water. Statement 2 reverses the two silicates - tricalcium silicate gives the early strength and dicalcium silicate the later.
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