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Limestone calcined clay cement, often abbreviated LC3, reduces clinker content by combining clinker with

  • A.slag and gypsum in equal proportions
  • B.sand and a chemical accelerator
  • C.magnesia and a phosphate binder
  • D.calcined clay and limestone together

Answer: D

The calcined clay and the limestone react synergistically, so the pair performs better than either alone at the same replacement level. Suitable clays are far more widely available than slag or fly ash, which is the main argument for it.

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