One-part geopolymers and aluminosilicate gel-zeolite composites: factors influencing microstructure and engineering properties
- Mixing and curing of geopolymers and related alkali-activated materials without storage and handling of highly alkaline solutions possesses advantages regarding safety and economic viability. One possible approach is to produce these materials from solid silica feedstocks and solid sodium aluminate, and subsequent mixing with water. We present a comparison between geopolymers and aluminosilicate gel-zeolite composites synthesized by this route from different silica feedstocks (by-product silica from chlorosilane production, microsilica, rice husk ash) and with different SiO2/Al2O3 ratios, using results from XRD, NMR, SEM, thermal analysis, mechanical and acid resistance testing. The use of rice husk ash favors formation of a fully amorphous geopolymer with high strength. Utilization of the other silica feedstocks leads to formation of aluminosilicate gel-zeolite composites, the amount and kind of zeolites depending on the feedstock and the SiO2/Al2O3 ratio. These composites showMixing and curing of geopolymers and related alkali-activated materials without storage and handling of highly alkaline solutions possesses advantages regarding safety and economic viability. One possible approach is to produce these materials from solid silica feedstocks and solid sodium aluminate, and subsequent mixing with water. We present a comparison between geopolymers and aluminosilicate gel-zeolite composites synthesized by this route from different silica feedstocks (by-product silica from chlorosilane production, microsilica, rice husk ash) and with different SiO2/Al2O3 ratios, using results from XRD, NMR, SEM, thermal analysis, mechanical and acid resistance testing. The use of rice husk ash favors formation of a fully amorphous geopolymer with high strength. Utilization of the other silica feedstocks leads to formation of aluminosilicate gel-zeolite composites, the amount and kind of zeolites depending on the feedstock and the SiO2/Al2O3 ratio. These composites show beneficial dehydration behavior, viz. no distinct dehydration step of thermal strain, with the phase assemblage after heating to 1000°C controlled by the starting composition. Mortars produced from both, the geopolymers as well as the composites, exhibit high resistance to sulfuric acid attack, making them promising materials for the construction and the repair of industrial and sewer structures.…
Autor*innen: | Gregor GluthORCiD, Patrick SturmORCiD, Sebastian Greiser, Christian Jäger, Hans-Carsten KühneORCiD |
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Persönliche Herausgeber*innen: | J. Wang, W. Kriven, T. Fey, P. Colombo, W.J. Weber, J. Amoroso, W.G. Fahrenholtz, K. Shimamura, M. Halbig, S. Kirihara, Y. Wu, K. Shurgart |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Proceedings of the 42nd International Conference on Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings Volume 39, Issue 3 |
Jahr der Erstveröffentlichung: | 2019 |
Organisationseinheit der BAM: | 6 Materialchemie |
6 Materialchemie / 6.3 Strukturanalytik | |
7 Bauwerkssicherheit | |
7 Bauwerkssicherheit / 7.4 Baustofftechnologie | |
Herausgeber (Institution): | American Ceramic Society |
Verlag: | John Wiley & Sons |
Jahrgang/Band: | 39 |
Ausgabe/Heft: | 3 |
Erste Seite: | 183 |
Letzte Seite: | 196 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau |
Freie Schlagwörter: | Alkali-activated materials; High-temperature resistance; One-part geopolymers; Sulfuric acid resistance |
Themenfelder/Aktivitätsfelder der BAM: | Infrastruktur |
Veranstaltung: | 42nd International Conference on Advanced Ceramics and Composites |
Veranstaltungsort: | Daytona Beach, FL, USA |
Beginndatum der Veranstaltung: | 21.01.2018 |
Enddatum der Veranstaltung: | 26.01.2018 |
DOI: | 10.1002/9781119543381.ch17 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 31.01.2019 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 06.04.2020 |