Preparation and Characterization of Lightweight Mullite-Silica Rich Glass Aggregates

Abstract

Phase compositions, microstructures and properties of four lightweight mullite-silica rich glass aggregates with high strength were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and FactSage 6.2 software. It was found that the lightweight aggregates with higher Al2O3 content had higher mullite content, porosity and larger mullite crystallites, but lower content and viscosity of melt at elevated temperature. Most of Fe2O3 and TiO2 were incorporated in mullite and most of K2O and Na2O were in glass to reduce viscosity of melt at elevated temperature.

Keywords

• Lightweight
• Mullite
• Silica rich glass
• Viscosity
• Composition