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Strength gain in concrete continues after 28 days because

  • A.the water to cement ratio falls with time
  • B.hydration of the slower phases carries on for months
  • C.the concrete absorbs strength from the reinforcement
  • D.the aggregate itself continues to harden

Answer: B

Belite in particular reacts slowly, and blended cements continue longer still through the pozzolanic reaction. The 28-day figure is a convention for specification rather than the final strength of the material. Long-term gain is one argument in favour of blended cements.

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