ABSTRACT
Constructive fire protection of underground constructions has gained increasing importance in line with growing road and rail traffic and the risks associated with tunnels. Fires in traffic tunnels can cause severe damage to the structure and, as a consequence, threaten the lives of occupants. Accordingly, the lining system must be planned and constructed to provide sufficient protection of people and to enable economical and practical rescue in the event of an emergency and repair. This paper reports on a comprehensive experimental investigation undertaken into the effect of micro-synthetic fibres on the fire resistance of concrete, giving a detailed background of concrete spalling processes under thermal exposure and the beneficial effects of these fibres.
