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State whether the following is true or false.
Blended cements are a recent innovation of the last decade.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: D

Correct answer: False

Blended cements are very old. The Romans used volcanic ash with lime, and slag cements have been made industrially since the nineteenth century. What is recent is the scale of their use, driven by the cost of clinker and by the carbon dioxide released in making it.

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