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Discussion

Loss on ignition of a cement indicates chiefly

  • A.the quantity of gypsum that was interground with it
  • B.pre-hydration and carbonation during storage
  • C.the free lime content of the clinker it was made from
  • D.the fineness to which the cement was finally ground

Answer: B

Heating drives off combined water and carbon dioxide taken up from the air, so a high figure suggests the cement has been stored badly. Standards set a maximum for exactly this reason. Fresh cement from the mill shows a very low figure indeed.

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