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Coloured cements are usually produced by

  • A.changing the fineness of the grinding
  • B.adding pigments to white cement
  • C.burning the clinker in a coloured flame
  • D.dyeing the finished concrete surface

Answer: B

Correct answer: adding pigments to white cement

Colour is obtained by grinding in mineral pigments - iron oxides, chromium oxide, cobalt compounds - at a few per cent by mass. The pigment must be stable in the alkaline environment and fast to light, which restricts the palette considerably compared with paints.

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