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The ferrite phase in clinker has a variable composition, which means that

  • A.it forms only in the clinker of white cement
  • B.it hydrates faster than any of the other phases
  • C.it cannot be seen at all under a microscope
  • D.its formula lies on a solid solution series

Answer: D

The proportion of aluminium to iron varies continuously, so the conventional formula represents one point on a range rather than a fixed compound. This is one reason Bogue figures are estimates rather than measurements.

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