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Calcium hydroxide produced during hydration is significant chiefly because it

  • A.gives the finished concrete its characteristic grey colour
  • B.protects steel reinforcement by keeping the pore water alkaline
  • C.provides very nearly all of the strength of the hardened paste
  • D.prevents any further hydration from taking place at all

Answer: B

The high pH forms a passive film on embedded steel that resists corrosion. Carbonation gradually consumes the hydroxide and lowers the pH, which is what eventually puts the reinforcement at risk. Cover depth is specified to delay that front reaching the steel.

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