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A concrete producer finds that a batch of rice husk ash gives no strength improvement at all.

What is the most likely cause?

  • A.The husk contained too much silica
  • B.The ash was stored too long
  • C.The husk was burnt too hot
  • D.The ash was ground too finely

Answer: C

Pozzolanic activity depends on the silica remaining amorphous, and above about 700 degrees it converts to crystalline forms that do not react with lime. Combustion control is what separates a valuable ash from a filler.

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