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Geopolymer or alkali-activated binders are produced by

  • A.burning ordinary limestone at a very much higher temperature
  • B.grinding Portland clinker together with additional gypsum
  • C.dissolving magnesia in a concentrated phosphate solution
  • D.activating an aluminosilicate with a strong alkaline solution

Answer: D

Fly ash, slag or calcined clay reacts with sodium silicate or hydroxide to form a binding network without any Portland clinker. Handling the caustic activator safely is one of the practical obstacles to wider adoption.

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