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Three of the following improve the durability of marine concrete. Which is the odd one out?

  • A.the use of a supplementary cementitious material
  • B.a higher water content to improve workability
  • C.a low water to cement ratio in the mix
  • D.generous cover to the reinforcement

Answer: B

Extra water increases permeability and shortens the life of the concrete. The other three each reduce chloride ingress to the reinforcement within. Permeability is the property that matters most. Water content governs permeability directly.

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