How core filling affects intumescent paint coatings

Core filling is a viable solution to fire-protect high Hp/A hollow section steel that is otherwise unable to achieve the desired FRL.

It provides additional options between:

  • Upgrading the steel size
  • Lowering DFTs

A grout or standard concrete mix (<40MPa) loosely packed concrete is adequate.

Mix lowers the Hp/A of the steel member and justifies a significant reduction in required dry film thickness of intumescent paint coatings to meet high FRLs.  

The benefits of core-filling hollow section steel are:

  • It lowers the Hp/A value
  • The mix adds thermal resistance to the structural steel
  • It forms a composite column with higher compressive capacity
  • Lower film builds can have aesthetic advantages in terms of level of finish
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