Sandersfire International

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Firecrete - Structural Properties

The following data summarises the result of an extensive and ongoing structural testing programme at South Bank University, Department of Civil Engineering, London.

Key areas of investigation have been:

  • Relationship between workability and compressive strength;
  • Effect of steel reinforcement on flexural strength;
  • Influence of span/depth ratio and seal geometry on load bearing performance of floor seals.

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Relationship between workability and compressive strength


Firecrete STD (N/mm2) Firecrete HS (N/mm2) Firecrete HD (N/mm2)
Consistency 24 hours28 days 24 hours28 days 24 hours28 days
Pourable2.55.06.513.06.012.0
Plastic4.08.08.517.07.515.0
Stiff5.010.011.022.09.519.0

Effect of steel reinforcement on flexural strength


Steel Reinforcing BarFirecrete Beam Cross Section ReinforcementFlexural Strength at 28 days (N/mm2)
No x dia (mm)(mm)(%)Firecrete STDFirecrete HS
None100 x 100Nil2.85.0
1 x 8130 x 750.523.06.4
1 x 10130 x 750.813.78.0
1 x 12130 x 751.165.010.8
2 x 10130 x 751.614.314.7
2 x 12130 x 752.32-9.3

Effect of steel reinforcement on flexural strength

Influence of span/depth ratio and seal geometry on load bearing performance of Firecrete HS floor seals


Sizes tested:

  • Openings 900 x 900 up to 2000 x 600;
  • Typical one-way spanning situation;
  • Typical two-way spanning situation;
  • One and two-way spanning enhanced by additional perimeter bonding.

Failure Pressure / Span Depth Ratio Graph

(click graph to enlarge)