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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.zeige mehrzeige weniger

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Autor*innen:Gregor GluthORCiD, Patrick SturmORCiD, Sebastian Greiser, Christian Jäger, Hans-Carsten KühneORCiD
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
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