Comprehensive review of the properties of fly ash-based geopolymer with additive of nano-SiO₂

Abstract Nano-SiO 2 is a non-toxic, tasteless, and pollution-free material with hydroxyl groups that facilitate the adsorption of water on its surface. characterized by small particle size, high purity, low density, large surface area, good dispersion properties. In addition, nano-SiO has excellent stability, reinforcement, thixotropy, optical mechanical The additive can enhance properties microstructure concrete. Therefore, widely used as an in field building materials. Geopolymers have properties, acid–alkali resistance, fire high-temperature resistance. mineral waste construction be raw materials for geopolymers. geopolymers potential to substitute ordinary Portland cement prospects application nanomaterials geopolymer products shown effective increasing rate geopolymerization reaction reducing setting time controlled quantity. Related results indicate appropriate quantity make fly ash-based denser produce higher strength. this study, based mechanism geopolymerization, effects including compressive strength, microstructure, hardening shear bond durability, practical applications been summarized. This study provide basis understanding durability