Fire resistance evaluation of lightweight geopolymer concrete system exposed to elevated temperatures of 100-800 °C

This paper reports the fire resistance property of a lightweight aggregate geopolymer concrete (LWAGC) material synthesized by the alkali-activation of locally source fly ash (FA) after exposed to elevated temperatures ranged of 100 degrees C to 800 degrees C. The results illustrates that the concrete gained a compressive strength after exposing to elevated temperatures of 100, 200 and 300 degrees C. Afterward, the strength of the LWAGC is started to deteriorate after exposing to elevated temperatures ranged of 400 degrees C to 800 degrees C, due to the difference in thermal expansion between the geopolymeric paste and LWA as well as to the evaporation of the structural water which increased the thermal shrinkage.