During their service life, structures may be subjected to several damage causes. Fire damage is considered one among of the excepted causes. Moreover, as material properties can change dramatically due to exposure to high temperature associated with fire, investigating their performance under fire is so important to assure the structure safety when subjected to fire.

Concrete shows generally better fire resisting characteristics when compared to the other construction materials due to its relatively low thermal conductivity, high heat capacity and slower strength degradation with temperature. On the other hand, cellular lightweight concrete (CLC) is considered one the novel types of concrete which is suitable and preferable for several construction applications due to its numerous advantages including thermal properties, lightweight, …etc.

The lack of the existing data about the fire endurance of CLC material led to the need of the current experimental investigation. So, this study is designed to investigate the performance of CLC mixtures with different densities under fire with several temperature levels as well as different duration of exposure. After exposure to high rise temperature, the residual compressive properties were investigated. The results revealed that the CLC mixtures show better residual compressive properties compared with those for traditional Portland cement concrete mixtures. Moreover, CLC mixtures with lower densities showed better residual compressive properties compared to mixtures with higher density values.