Characterisation of surface properties of various fly ashes

The paper reports a study of fly ashes obtained as a result of black and brown coal combustion by the following methods: chemical analysis, X-ray diffraction (XRD), infrared (IR) spectroscopy, differential thermal analysis, (DTA), low-temperature nitrogen and methylene blue adsorption and scanning electron microscopy (SEM). The samples of fly ashes of different types were characterised by different chemical compositions, structures, surface areas and porosities.