Preparation of closed pore structure of fully waste-based foam glass-ceramic for thermal insulation from waste granite, glass and marble
Lei Han, Ruling Du, Yu Chen, Longhao Dong, Chenyang Xi, Ningning Mei, Liang Li, Shaowei Zhang
Abstract
Foam glass-ceramics (FGCs) offer an exceptional solution for thermal insulation, featuring lightweight, low thermal conductivity and minimal water absorption. Closed pore structures significantly improve thermal efficiency and mechanical strength, though they are challenging to create. In the present work, an innovative study reveals a process that transforms waste granite, glass, and marble into a fully sustainable foam glass-ceramic, with waste marble serving as an effective blowing agent. The optimal production involves adding 5 wt% waste marble and sintering at 1100 °C for 2 hours, resulting in a closed pore structure that outperforms open pores in insulation. The final product achieves a density of 0.27 g/cm 3 , a specific strength of 15.3 MPa·cm 3 ·g -1 , and an impressive thermal conductivity of just 0.113 W/(m·K). This unlocks significant economic and environmental advantages by recycling waste into FGC. With its superior insulation and durability, FGC is a sustainable option for wall insulation, promoting a greener future while addressing waste management challenges.