Journal
MATERIALS
Volume 13, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/ma13030535
Keywords
alkali activated geopolymer foams; metakaolin; Na2O2; fire resistance; ceramics
Categories
Funding
- Natural Science Foundation of China [51404200]
- Science and Technology Innovation Talent Foundation of Sichuan Province [20132065]
- Southwest University of Science and Technology [14tdgk04, 17lzx618, 18lzx654]
- Postgraduate Innovation Fund Project, Southwest University of Science and Technology [19ycx0039]
- State Key Laboratory of Solid Waste Reuse for Building Materials [SWR-2013-005]
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This work aims to investigate the feasibility that alkali-based geopolymer foams produced from metakaolin and Na2O2 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 Na2O2 amounts. As Na2O2 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 degrees 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.
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