Steel fibre-reinforced shotcrete
Steel fibre-reinforced shotcrete (SFRS) is shotcrete (spray concrete) with steel fibres added. It has higher tensile strength than unreinforced shotcrete and is quicker to apply than weldmesh reinforcement. It has often been used for tunnels.[1][2]
Advantages
The primary advantages of fibre-reinforced shotcrete are:
- Addition of steel fibers into the concrete improves the crack resistance (or ductility) capacity of the concrete. Traditional rebars are generally used to improve the tensile strength of the concrete in a particular direction, whereas steel fibers are useful for multidirectional reinforcement. This is one of the reasons why steel fiber reinforced (shotcrete form) concrete successfully replaced weldmesh in lining tunnels.
- Less labour is required.
- Less construction time is required.
Applications and types
SFRS has various types, which are applicable to differing situations. Primary uses are:
- Tunnels - uses short steel fibers
- Industrial floorings - uses long steel fibers
See also
References
- ^ Swamy, R. N., ed. (31 December 1990). Fibre Reinforced Cement and Concrete: Proceedings of the Fourth RILEM International Symposium. RILEM (International Union of Laboratories and Experts in Construction Materials, Systems, and Structures).
- ^ Hoek, E., ed. (31 December 1990). Underground Excavations in Rock: Published for the Institution of Mining and Metallurgy. Elsevier Applied Science.