What is steel fibre reinforced concrete?
Steel fibre reinforced concrete is a concrete where the inter-granular mortar (theorigin of all cracking) is controlled by steel fibres. For a concrete with a 20mmaggregate the distance between adjacent fibres should be kept to between 18 and 20mm when casting a joint free floor (TAB-Floor) or a piled suspended slab (TABStructural) and between 22 to 24mm for jointed (TAB-Fibre) floors.
When the fibre spacing falls below 18mm, the concrete will become difficult to pump requires modification to the mix design.
To control shrinkage in the concrete, a minimum fibre dosage of 20kg/m³ is required. Fibre dosages of below this will not provide effective control of shrinkage within the concrete.
For joint free (TAB-Floor) floors a minimum fibre dosage of 40 kg/m³ when using 1 mm diameter fibres is mandatory.
For suspended floors on piles (TAB-Structural) a minimum dosage of 45 kg/m³ TABIX+ 1/60 fibres is required.
