A new type of technology of foamed gel with fly ash is developed to prevent and extinguish fire so as to overcome the existing shortages of fire prevention technologies. As a complex multi-component foam system, the foamed gel with fly ash is mainly formed by putting foaming agent, thickener and crosslinker into fly ash slurry, introducing nitrogen and stirring physically and mechanically. The experiments were done to investigate the microstructures of foamed gel with fly ash and theoretically analyze its gelation process and mechanism. The results show that the foaming agent is one of the key factors of forming foamed gel. And when the thickener dissolved in water, the helical mesh polymer or double helix cluster are formed by molecular chains, besides, active group in polymer or cluster fully collide with that in the main chain structures of crosslinker, thereby the three-dimensional network structures are formed, making the scattered polymer and cluster form a uniform continuous phase.
