Question

Which material is prone to spalling under fire conditions?

1) Concrete
2) Wood
3) Steel
4) Glass

Answer 1

Concrete is prone to spalling under fire conditions due to the formation of internal pressure caused by expanding steam.

Step-by-step explanation:

Concrete is prone to spalling under fire conditions. Spalling refers to the breaking off of small pieces or layers from the surface of a material. In the case of concrete, when it is exposed to high temperatures, the water trapped within it turns into steam, causing the concrete to expand rapidly. This results in the formation of internal pressure, which leads to spalling and the disintegration of the concrete surface.