SEM images were examined under JEOL-JXA-733 Superprobe, scanner electron microscope, in secondary electron imaging. The study showed that despite containing a small amount of microspheres, Seyitömer fly ash also comprises a lot of porous
particles. Microanalyses under SEM also revealed that these porous particles are actually calcium aluminosilicates, unburnt carbon, anhydride and mullite which are composed of kaolinite (Fig. 3).