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Natural or Roman cement, used widely in the nineteenth century, was made by

  • A.calcining a very pure limestone in an open fire
  • B.mixing calcined bauxite with a strong chloride solution
  • C.burning argillaceous limestone at a moderate temperature
  • D.grinding volcanic ash together with slaked lime

Answer: C

The clay already present in the stone supplied the silica and alumina, so no separate raw mix was needed. It set quickly and was much used for stucco before Portland cement displaced it. Its rapid set suited the decorative work of the period.

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