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Question

Consider the following statements:
High early strength of cement is obtained as a result of
A. Fine grinding
B. Decreasing the lime content
C. Burning at higher temperatures
D. Increasing the quantity of gypsum
Which of these statements are correct?

A
Only A and B
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B
Only A and C
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C
Only B, C and D
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D
Only A, C and D
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Solution

The correct option is B Only A and C
  • For high early strength of cement it should be grounded more finely.
  • Lime content should be less. An increase in lime content beyond a certain limit, makes it difficult to combine completely with other compounds.
  • Consequently free lime will result in an unsound cement.
  • Clinker is obtained as a result of incipient fusion and sintering at a temperature of about 1400oC to 1500oC. Because ferric oxide has a lower melting point than the other oxides, it acts as a flux.
  • Increasing the quantity of gypsum causes increased setting time.

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