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Home > Structure > Concrete > Concrete general > Pre-mixed concrete Firth Steelcrete® And Steelcrete® Shotcrete Firth has currently engaged in an environmental assessment of its products with Greenbuild. Work is in progress and results will be published shortly.Steelcrete® is a Steel Fibre Reinforced Concrete (SFRC) introduced by Firth in 1996 and used in many successful structural applications. Homogenous steel fibres are mixed throughout the concrete so that when it is placed, the need for in situ steel reinforcement is eliminated or substantially reduced. The purpose of adding steel fibres to the mix is to maintain and enhance the post cracking tensile strength of the concrete. Plain concrete is brittle while Steelcrete® is a homogenous ductile composite product. Steelcrete® Shotcrete is a variant that is sprayed, on to slopes for example, to provide immediate reinforced ground support.
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Steelcrete® is used for construction of industrial floors and pavements. Firth has developed Steelcrete® mix designs that enable standard concreting techniques for placing, screeding, and finishing. Steelcrete® floors can be thinner than equivalent conventionally reinforced floors and its use can save the time and cost of placing reinforcing bars. Steelcrete® Shotcrete is used for tunnel linings, slope stabilisation and retaining walls. It is sprayed in a uniformly thick layer and eliminates the need for mesh.
Firth Steelcrete® makes industrial floors and pavements easier to construct, less costly, and very flat compared to regular ‘steel-reinforced concrete’. A major benefit is high flexural strength that lowers the risk of industrial floors and pavements cracking due to long term drying shrinkage, load and impact. Steelcrete® Shotcrete, by eliminating the need for reinforcing mesh, increases its bond to the ground surface and allows it to better follow the contour of the ground. This in turn avoids overuse of concrete to fill up pockets behind the mesh and reduces the likelihood of voids forming and subsequent infiltration of water.
Firth Steelcrete® uses Dramix steel fibres as its reinforcement. They are made from hard drawn low carbon steel, in accordance to ASTM A820.90 Type 1 and have a minimum tensile strength of 1000MPa. A wide range of fibre aspect ratios (defined as fibre length to its diameter) of 45-80 is available to suit specific structural requirements of a wide variety of applications. Steelcrete® typically uses Dramix 65/60 steel fibres while Steelcrete® Shotcrete makes use of Dramix 65/35 steel fibres. Firth is committed to sustainability in concrete manufacture and distribution, including the recycling of surplus raw materials, water and leftover concrete.
Firth Steelcrete® redistributes stress over a larger area, increasing load bearing capacity and significantly reducing the chances of cracking. Experimental results of restrained shrinkage tests of Steelcrete® show that fibres can effectively bridge shrinkage cracks and pinch them together, while these cracks are found to be wider and more rapidly growing in the case of non-fibrous concrete. A drastic decrease of nearly 90% can be achieved in crack width with Steelcrete® having volume fraction of 0.5 (corresponding to fibre weight dosage of 20 kg/m³).
Firth Steelcrete® industrial floors and pavements can be installed without the need for placing mesh, enabling trucks to be unhindered when delivering concrete to the workface. Steelcrete® can be placed continuously allowing larger slabs to be poured each day. Steelcrete® Shotcrete is sprayed in a uniformly thick layer, without the need for mesh, to create tunnel linings, retaining walls and for slope stabilisation.
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