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The main practical obstacle to using geopolymer concrete widely is

  • A.its inability to gain any strength at all
  • B.the impossibility of testing it in a laboratory
  • C.handling the caustic activator safely on site
  • D.the complete absence of any suitable raw material

Answer: C

Correct answer: handling the caustic activator safely on site

Geopolymers are activated by strong alkali - sodium hydroxide or silicate solution - which burns skin and eyes and demands protective equipment and training that ordinary site practice does not include. The chemistry works; the practicality of the activator is what has held the material back.

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