The Structural Engineer's Corner

Eng. Onorio Francesco Salvatore

Design for durability, part II – surface of members in interior environments

Written By: Lexatus - Oct• 19•13

Interior Concrete - Onorio

Following the previous post on durability (“Design for durability, part I – surface of members in contact with the ground“), in the following there are the requirements for surface of members in interior environments.

  • Fully enclosed within a building except for a brief period of weather exposure during construction (residential);
    • Exposure classification = A1;
    • Minimum concrete strength, f’c = 20 MPa;
    • Minimum initial curing = continuously for at least 3 days;
    • Minimum average compressive strength at the time of stripping of forms or removal from moulds = 15 MPa;
    • Required cover where standard formwork and compaction are used = 20 mm.
  • Fully enclosed within a building except for a brief period of weather exposure during construction (non-residential);
    • Exposure classification = A2;
    • Minimum concrete strength, f’c = 25 MPa;
    • Minimum initial curing = continuously for at least 3 days;
    • Minimum average compressive strength at the time of stripping of forms or removal from moulds = 15 MPa;
    • Required cover where standard formwork and compaction are used = 30 mm.
  • In industrial buildings, the member being subject to repeated wetting and drying;
  • Exposure classification = B1;
  • Minimum concrete strength, f’c = 32 MPa;
  • Minimum initial curing = continuously for at least 7 days;
  • Minimum average compressive strength at the time of stripping of forms or removal from moulds = 20 MPa;
  • Required cover where standard formwork and compaction are used = 40 mm.

 

 

For any issues or questions, you can contact the author at:

onorio@strutturista.com

Eng. Onorio Francesco Salvatore

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