ABSTRACT
PP fibres cannot protect concrete from thermal deterioration. However, in case of fire ingress micro-synthetic PP fibres intermixed into the concrete can have the following effects.
1 INTRODUCTION
1.1 Tunnel fires
Fire disasters in traffic tunnels (Kusterle et al. 2004), such as the fires in the Storebælt Tunnel1994, in the Euro Tunnel-1996, 2008, in the Mont Blanc Tunnel-1999, in the Tauern Tunnel-1999 and in the Gotthard Tunnel-2001, not only interrupted important European traffic connections for a long time but also severely damaged the concrete inner lining of these tunnels.
