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The hydration product that gives hardened cement paste most of its strength is

  • A.crystalline calcium hydroxide
  • B.calcium sulphoaluminate
  • C.unreacted tricalcium silicate
  • D.calcium silicate hydrate gel

Answer: D

The poorly crystalline gel formed by both silicates fills the space between the grains and binds them together. The calcium hydroxide liberated alongside it contributes little strength and is the component a pozzolana consumes.

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