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Investigations on one-part geopolymers synthesized from different silica sources

  • One-part geopolymers, synthesized from three different silica sources and sodium aluminate, were investigated regarding their microstructure and the evolution of their compressive strength on curing at slightly elevated temperatures. The effect of thermal treatment was studied up to 1000 °C and for the investigation of the chemical durability specific samples were treated with sulfuric acid (H2SO4, pH = 1). Depending on the silica feedstock, different degrees of reaction were observed. One of the silicas had a significantly higher reactivity. For two of the silicas, significant amounts of zeolites occurred as reaction products besides geopolymeric gel, whereas the more reactive silica source lead to the formation of a rather fully condensed geopolymeric network. The composites indicated promising behavior on heating in so far as no distinct shrinkage step occurred in the temperature range of dehydration. Up to 400 °C the residual strength of those mixes increased. Above 800 °C theOne-part geopolymers, synthesized from three different silica sources and sodium aluminate, were investigated regarding their microstructure and the evolution of their compressive strength on curing at slightly elevated temperatures. The effect of thermal treatment was studied up to 1000 °C and for the investigation of the chemical durability specific samples were treated with sulfuric acid (H2SO4, pH = 1). Depending on the silica feedstock, different degrees of reaction were observed. One of the silicas had a significantly higher reactivity. For two of the silicas, significant amounts of zeolites occurred as reaction products besides geopolymeric gel, whereas the more reactive silica source lead to the formation of a rather fully condensed geopolymeric network. The composites indicated promising behavior on heating in so far as no distinct shrinkage step occurred in the temperature range of dehydration. Up to 400 °C the residual strength of those mixes increased. Above 800 °C the samples underwent new phase formation. After exposure to sulfuric acid (pH 1; 70 d) specimens showed a residual compressive strength of about 77 % of the reference, indicating high acid resistance.zeige mehrzeige weniger

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  • NTCC2017_Supplementary_paper_Sturm et al.pdf
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  • Investigations on one-part geopolymers synthesized from different silica sources_Titelblatt.pdf
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Metadaten
Autor*innen:Patrick SturmORCiD, Gregor GluthORCiD, Sebastian Greiser, Christian Jäger, H.J.H. Brouwers, Hans-Carsten KühneORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Präsentation
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Proceedings of the the 6th International Conference on Non-Traditional Cement & Concrete
Jahr der Erstveröffentlichung:2017
Erste Seite:299
Letzte Seite:306
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Acid resistance; Chemical durability; Geopolymers; Thermal properties; Zeolites
Veranstaltung:6th International Conference on Non-Traditional Cement & Concrete
Veranstaltungsort:Brno, Czech Republic
Beginndatum der Veranstaltung:19.06.2017
Enddatum der Veranstaltung:22.06.2017
ISBN:978-80-214-5507-8
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:11.07.2017
Referierte Publikation:Nein
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