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Advanced concrete materials for floating wave energy converters

Date: September 18, 2018 at 11:13 GMT

[This poster won 2nd prize at the 2018 ICOE Poster Awards]

Reinforced concrete (RC) is well suited for the offshore environment, with good strength and stiffness properties at a low unit cost. However, there are a number of issues with using the material in its conventual form for floating structures.

  • Concrete is heavy, with minimum wall thicknesses driven by the practicality at fitting in internal steel rebar with adequate cover to ensure durability - can be an issue for floating structures;
  • Concrete cracks under tension - reduced permeability of cracked concrete can be an issue for reinforcement durability and watertightness. Additional prestressing is often required to keep structure in compression.
  • Dynamic, multi-axial force regimes result in complex internal reinforcement requirements; rebar is a high cost item for RC structures.
  • Complex shapes require complex formwork; also, a high cost item.

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