Concrete increases safety in case of fire
Concrete does not burn. A concrete construction can withstand even great heat. Concrete walls and ceilings offer the highest possible protection against the spread of fire.
Structural fire protection helps to prevent large fires from developing in the first place and to keep fires confined to the smallest possible spaces. Therefore, components and structures must be able to resist fire for a sufficiently long time. Building components made of concrete are classified as non-combustible building materials class A1 and thus meet the requirements of the highest fire resistance class. This is because the structural elements - concrete walls and ceilings - do not burn or melt even under the usual heat development of approx. 1,000°C in the event of a fire. This means that the building remains protected against collapse and one of the main dangers to life and limb has been averted.
More about this topic at Beton.org