Applying inorganic geopolymers added with aluminium powder to fire-resistant fillers

In this study, aluminium powder was added to inorganic geopolymers, which created pores that foamed to reduce the specimen weight and effectively insulated heat. The produced material can be used as fire-resistant fillers for increasing the thermal-insulating performance of fire doors. The specimens were manufactured by mixing 0.1% aluminium powder with inorganic geopolymers for various mixing durations. The standard temperature rising curves regulated in China National Standards 12514 were used as the basis of the heating experiments. The specimen interior was heated at 945 degrees C and the unexposed-surface temperature of the specimen was measured within 1 hour. The experimental results complied with the China National Standards 11227 requirements for Class A fire doors, which specify that the unexposed-surface temperature must not exceed 260 degrees C after combusting at 925 degrees C for 1 hour. Through this study, it was verified that the addition of aluminium powder into the inorganic geopolymers can be applied to the fire-resistant fillers of fire doors.