The results of recent studies [8–11] have shown the effective- ness of low-calcium fly ash based geopolymer concrete as a con- struction material. As a relatively new construction material, it is essential to study the performance of geopolymer concrete in various structural applications. The previous research on fly ash based geopolymer concrete studied numerous short-term and long-term properties. Various parameters influencing the strength of geopolymer concrete were investigated [1,2]. It was shown that heat-cured geopolymer concrete possesses high compressive strength, undergoes low In addition to other structural behaviours, it is vital to under- stand the fire endurance of a construction material in order to ensure safety for life and property. The extent of cracking, spalling and residual strength of a material after exposure to high temper- ature fire gives indication of the fire endurance of the material. This paper presents a study on the fire endurance of fly ash based geopolymer concrete.