Enhancement of the Thermal Durability of Fly Ash-Based Geopolymer Paste by Incorporating Potassium Feldspar

The aim of this research is to study the effect of different percentages of potassium feldspar (KF) (0%, 5%, 10% and 20% by weight) on the proficiency of fly ash (FA)-based geopolymer paste when exposed to elevated temperatures of 300 °C, 600 °C and 900 °C. The percentages (by weight of the source material) of both Na2O and SiO2 were fixed at 8% each. The behaviour was evaluated on the behalf of residual strength, weight loss, volumetric...