Engineering properties of alkali activated fly ash foams

  • Alkali-activated fly ash foams – mechanical, chemical and physical properties Alkali-activation of fly ash together with an aluminum powder blowing agent led to the synthesis of inorganic fly ash-based foam. The aluminium powder reacts with the alkalies from the activation solution. Hydrogen is released during this reaction and creates a closed-pore structure. The amount of liquid activation solution and aluminium powder was optimized considering proper pore distribution and feasible bulk density of the resulting foam. The viscosity of the initial mix was found as a crucial factor for the foaming process as well as for the stability of the fresh foam. The fly ash foam is characterized in terms of its compressive and flexural strength, thermal conductivity and capacity, resistance to chemically aggressive environments, fire resistance and 2D morphology. The fire resistance test shows, that almost all mass loss occurres below 500°C and the biggest volume change take place betweenAlkali-activated fly ash foams – mechanical, chemical and physical properties Alkali-activation of fly ash together with an aluminum powder blowing agent led to the synthesis of inorganic fly ash-based foam. The aluminium powder reacts with the alkalies from the activation solution. Hydrogen is released during this reaction and creates a closed-pore structure. The amount of liquid activation solution and aluminium powder was optimized considering proper pore distribution and feasible bulk density of the resulting foam. The viscosity of the initial mix was found as a crucial factor for the foaming process as well as for the stability of the fresh foam. The fly ash foam is characterized in terms of its compressive and flexural strength, thermal conductivity and capacity, resistance to chemically aggressive environments, fire resistance and 2D morphology. The fire resistance test shows, that almost all mass loss occurres below 500°C and the biggest volume change take place between 800°C and 1100°C. An excellent chemical durability stems mainly from the closed-pore network and absence of leachable Ca in the system. Experiments and micromechanical simulations prove that reasonable bulk densities lie in the range of 400 to 800 kg/m3.zeige mehrzeige weniger

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Metadaten
Autor*innen:Petr Hlavacek
Koautor*innen:V. Smilauer
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Alkali activation; Foam; Inorganic
Veranstaltung:92. DKG Jahrestagung
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:19.03.2017
Enddatum der Veranstaltung:22.03.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:04.04.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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