The Interface Reactions and Solidification Mechanism of Glassy Waste under Hydrothermal Conditions

In this paper, the reaction mechanism of glassy waste in both single-glass and glass–Ca(OH)2 systems was investigated. However, while adding Ca2+ or Al3+ ions into reaction solutions, the ions interacted with the Si-rich hydrated layer on the surface of glass particles and produced zeolite or anorthite crystals between glass particles. As for glass-Ca(OH)2 system, besides facilitating the formation of crystals between glass particles, additional Ca2+ or Al3+ ions also promoted the growth of tobermorite or xonotlite crystals at the glass–Ca(OH)2 interface. In conclusion, the strength of materials was greatly enhanced by strengthening crystal connections in glass particles and at the glass–Ca(OH)2 interface.