Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Use of sodium metasilicate as silica source and stabilizing agent in two-part metakaolin–H2O2 geopolymer foams
Graphical abstract Display Omitted
Highlights Sodium metasilicate was used as a complementary silica source in two-part geopolymer foams. Sodium metasilicate acted as a stabilizing agent in H2O2–geopolymer foam. H2O2 should be limited to a SiO2/Al2O3 ratio up to 2.5 for curing at 50 °C. SiO2/Al2O3 = 2.5 and H2O2 = 6.0% were most conducive to the porous structure. Produced geopolymer foams can be used as lightweight insulating cores.
Abstract The synergistic effects of the SiO2/Al2O3 ratio (2.0, 2.5, and 3.0) and H2O2 content (1.5%, 3.0%, and 6.0%) were evaluated in metakaolin-based geopolymer foams using sodium metasilicate pentahydrate as a complementary silica source. Sodium metasilicate helped to stabilize the pores in foams with SiO2/Al2O3 molar ratios of up to 2.5 cured at 50 °C without stabilizing additives. The optimum porous system for insulation cores was obtained using a SiO2/Al2O3 ratio of 2.5 and H2O2 content of 6%. Furthermore, a SiO2/Al2O3 molar ratio of 3.0 reduced pore formation as the increased geopolymerization and viscosity served as a barrier to bubble diffusion.
Use of sodium metasilicate as silica source and stabilizing agent in two-part metakaolin–H2O2 geopolymer foams
Graphical abstract Display Omitted
Highlights Sodium metasilicate was used as a complementary silica source in two-part geopolymer foams. Sodium metasilicate acted as a stabilizing agent in H2O2–geopolymer foam. H2O2 should be limited to a SiO2/Al2O3 ratio up to 2.5 for curing at 50 °C. SiO2/Al2O3 = 2.5 and H2O2 = 6.0% were most conducive to the porous structure. Produced geopolymer foams can be used as lightweight insulating cores.
Abstract The synergistic effects of the SiO2/Al2O3 ratio (2.0, 2.5, and 3.0) and H2O2 content (1.5%, 3.0%, and 6.0%) were evaluated in metakaolin-based geopolymer foams using sodium metasilicate pentahydrate as a complementary silica source. Sodium metasilicate helped to stabilize the pores in foams with SiO2/Al2O3 molar ratios of up to 2.5 cured at 50 °C without stabilizing additives. The optimum porous system for insulation cores was obtained using a SiO2/Al2O3 ratio of 2.5 and H2O2 content of 6%. Furthermore, a SiO2/Al2O3 molar ratio of 3.0 reduced pore formation as the increased geopolymerization and viscosity served as a barrier to bubble diffusion.
Use of sodium metasilicate as silica source and stabilizing agent in two-part metakaolin–H2O2 geopolymer foams
dos Santos, Maria Natali Gomes (Autor:in) / dos Santos, Cassiana Mendonça (Autor:in) / de Souza, Marcelo Tavares Gomes (Autor:in) / de Vasconcelos, Elder Alpes (Autor:in) / da Nóbrega, Ana Cecília Vieira (Autor:in) / Marinho, Érika Pinto (Autor:in)
20.05.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Alkali–silica reaction in metakaolin-based geopolymer mortar
| British Library Online Contents | 2015
Alkali–silica reaction in metakaolin-based geopolymer mortar
| Online Contents | 2014
Alkali–silica reaction in metakaolin-based geopolymer mortar
| Springer Verlag | 2014