MAP20071506186 Kitchen, Andrew Concrete ideas / Andrew Kitchen Passive fire protection in tunnels has become an important issue since tunnels fires have shown that intense heat can lead to explosive spalling in which the structural integrity of the concrete lining is impaired, exposing reinforcing steel to above-critical temperatures En: Fire prevention. - London. - nº 385, October 2004 ; p. 40-41 1. Seguridad pasiva . 2. Seguridad contra incendios . 3. Túneles . 4. Investigación sobre fuego . 5. Materiales ignifugados . 6. Comportamiento de estructuras . 7. Comportamiento de los materiales frente al fuego . I. Title. II. Título: Fire prevention.