Effect of Fire on Concrete

Concrete is a kind of long-term used construction material which can be used as long as 50 years and more, the long-term properties of concrete such as the fire resistance and durability performance are need to be valued. Both the mechanical and durability performance of the concrete will be severely deteriorated due to the destruction of the concrete micro-structure when the concrete is subjected to a high temperature environment. After fire, the severely deteriorated concrete cannot be used anymore and will be replaced using the new concrete in the RC structures. However, the concrete is still can be used after some strengthening and rehabilitation if the heating temperature is not too high. On the other hand, the residual durability properties of the fire damaged concrete will also be influenced by the high temperature even the deterioration of the mechanical properties is not serious. An effort to evaluate the effect of fire on properties of concrete have been studied.