Lightweight Cellular Glass Composite from Eggshell and Glass Cullet Powder for Insulation and Bioactive Glass Applications

Abstract

Cellular glass composites can be made of waste flat glass or bottle glass added with eggshell powder 0, 1, 3 and 5%wt and then fired at 800° and 900°C for 1 h using compression molding process. Adding eggshell powder mixed with glass cullet affects to form open and closed pores and to decrease firing temperature, thermal expansion coefficient and light weight. However, adding high amount of eggshell powder affects to form an excessively amount of open and closed pores effect to increase water absorption. The standard Thailand Industries determines water absorption of glass foam less than 25% because high water absorption affects to decrease mechanical properties. Therefore, cellular glass composites added 1, 3 and 5%wt should not be fired at temperature higher than 800°C for 1h. In addition, the cellular glass composites added 1 %wt eggshell powder and fired at 900°C for 1 h still have low water absorption and low thermal expansion coefficient. Cellular glass composites are potential to apply for many industries such as construction, petroleum and petrochemical, insulation, medical and dental applications.