FIBRE REINFORCED SHOTCRETE FOR LONG TUNNEL PROJECTS IN SWITZERLAND

摘要

Fibre reinforced shotcrete is nowadays a common support mean in tunnels. Fibres, and especially steel fibres, are added into shotcrete to improve the ductility and energy absorption. But also polypropylene fibres are in use as structural fibres to prevent spalling of the concrete. The determination of the properties of the material is normally done with rectangular or circular plate tests. The plates are supported on the whole circumference. Bending tests with beams are not very common to determine the properties of fibre reinforced shotcrete. The result from different test methods are compared to prove the existing relation between the different methods.