Peng Xi, Li Han, Shuai Qin, Wang Liancong
State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, China.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Materials (Basel). 2020 Jan 22;13(3):535. doi: 10.3390/ma13030535.
This work aims to investigate the feasibility that alkali-based geopolymer foams produced from metakaolin and NaO are applied for fire protection. Dry bulk density, porosity, mechanical strength, thermal conductivity, and fire resistance of the geopolymer foams are discussed as a function of the NaO amounts. As NaO content varies from 1% to 4%, dry bulk density, mechanical strength and thermal conductivity of the geopolymer foams approximately exhibit opposite trends with that of the porosity. At the later stage of the 3 h fire-resistance tests, the reverse-side temperatures of all tested samples were always maintained at 220-250 °C. Meanwhile, the amorphous skeleton structures have been converted to smooth ceramics during the high temperature processes, which is the main reason that the geopolymer foams possess a stable porous structure and excellent fire resistance. Therefore, we could conclude that alkali-activated geopolymer foams with extraordinary fire resistance have great potential for fire protection applications.
本研究旨在探讨由偏高岭土和NaO制备的碱基地质聚合物泡沫用于防火的可行性。讨论了地质聚合物泡沫的干堆积密度、孔隙率、机械强度、热导率和耐火性随NaO用量的变化情况。当NaO含量从1%变化到4%时，地质聚合物泡沫的干堆积密度、机械强度和热导率与孔隙率大致呈现相反的趋势。在3小时耐火测试的后期，所有测试样品的背面温度始终保持在220 - 250°C。同时，无定形骨架结构在高温过程中已转变为光滑的陶瓷，这是地质聚合物泡沫具有稳定多孔结构和优异耐火性的主要原因。因此，我们可以得出结论，具有卓越耐火性的碱激活地质聚合物泡沫在防火应用方面具有巨大潜力。
