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Discussion

A ragged or fringed rim on belite crystals suggests

  • A.that the clinker was quenched very rapidly
  • B.an excess of iron in the raw mix
  • C.that the kiln was running unusually cold
  • D.that the clinker was cooled slowly

Answer: D

Slow cooling gives the belite time to react with the surrounding melt and develop the characteristic fringe. Rapid quenching freezes the crystals with sharp boundaries instead. The rim is therefore a direct record of how the cooler performed.

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