ABSTRACT
The object of field investigation was to determine the condition of concrete and steel reinforcement of secondary lining of the tunnel after fire ignites inside the tunnel cladding. Activities performed
1 INTRODUCTION
During the performance of secondary concrete lining there was a spontaneous ignition from which the fire spread to the rest of the tunnel. The exact time of a fire is not known, so the age of burned concrete class C25/30 was estimated less than 16 hours.
