The structural characteristics of fly ash mainly include its particle morphology, chemical composition and physical properties.
The particle morphology of fly ash is diverse, usually with a porous honeycomb structure, which gives fly ash a large specific surface area and high adsorption activity. Under a microscope, the morphological characteristics of fly ash include a complex mixture of regular and irregular glass particles, unburned carbon, etc. The particle diameter of fly ash ranges widely, generally between 0.5-300μm, the density is 2.0-2.9g/cm³, the bulk density is 0.53-1.26g/cm³, the specific surface area is 900-8000cm²/g, and the water absorption is 90%-130%.