Concrete is absolutely fireproof
Concrete can do more than you think – there is only one thing it cannot do and that is to "burn". In the event of fire, the excellent fire protection properties of concrete protect people, property and even the environment. Concrete does not add to the fire load in a serious fire; it secures escape routes, prevents the fire from spreading and delays the collapse of the supporting structure. In this way, concrete satisfies all the governmental fire protection criteria and from the technical point of view is far superior in this respect to other construction materials. In the event of fire, concrete produces neither smoke nor toxic gases and thus reduces the risks for the occupants and the surrounding area.