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State whether the following is true or false.
Ordinary Portland cement concrete is suitable for furnace linings.

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

Answer: A

Its hydrates decompose on heating and the concrete loses strength and spalls. Refractory work uses calcium aluminate binders or purely ceramic materials designed for the temperature. Hydraulic and ceramic bonding are quite different mechanisms.

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