Preparation and characterization of acid-based geopolymer using metakaolin and disused polishing liquid

Abstract The aim of this work is to prepare acid-based geopolymer using metakaolin and disused phosphoric acid-based polishing liquid of aluminum alloy, which can be used to substitute pure phosphoric acid activator in the fabrication of acid-based geopolymer. It not only presents a good solidified method of hazardous components in the disused polishing liquid, but also provides an anti-corrosion and heat-resistance geopolymer material. The mechanical performance, phase structure and microstructure of this disused polishing liquid geopolymer are characterized in this study, and the results indicate that the disused polishing liquid had a higher reactive rate to metakaolin than pure phosphoric acid. Through the characterization of the compressive strength, electrical conductance, high temperature resistance and acid or alkali corrosion resistance of the geopolymer, it can be concluded that the disused polishing liquid acid based geopolymer has a higher reactivity than pure phosphoric acid when it developed a reaction with metakaolin.