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Corrosion of steel reinforcement in geopolymer mortars - Carbonation resistance, chloride migration, and preliminary corrosion potential data

  • Geopolymers present a group of novel building materials exhibiting improved chemical resistance, fire resistance and lower CO2 emissions over traditional OPC-based materials. Corrosion of steel rebars in concrete presents one of the main deterioration mechanisms limiting service life of the reinforced structures. The corrosion is accompanied by an expansion of the corrosion products causing high pressures, concrete cracking and finally spalling of a cover layer. Critical chloride concentration, loss of alkalinity and modeling of the steel corrosion are in researchers' spotlight for decades, however steel corrosion in geopolymer materials is insufficiently described and understood yet. An optimized geopolymer mixture based on German hard coal fly ash activated with sodium hydroxide and sodium silicate solutions was selected for steel reinforcement-corrosion experiments. The formation of passive layer on the steel rebars is observed after approx. two weeks of hardening at laboratoryGeopolymers present a group of novel building materials exhibiting improved chemical resistance, fire resistance and lower CO2 emissions over traditional OPC-based materials. Corrosion of steel rebars in concrete presents one of the main deterioration mechanisms limiting service life of the reinforced structures. The corrosion is accompanied by an expansion of the corrosion products causing high pressures, concrete cracking and finally spalling of a cover layer. Critical chloride concentration, loss of alkalinity and modeling of the steel corrosion are in researchers' spotlight for decades, however steel corrosion in geopolymer materials is insufficiently described and understood yet. An optimized geopolymer mixture based on German hard coal fly ash activated with sodium hydroxide and sodium silicate solutions was selected for steel reinforcement-corrosion experiments. The formation of passive layer on the steel rebars is observed after approx. two weeks of hardening at laboratory temperature. However, alternative heat-treatment at 80°C for several hours leads to immediate formation of the passive layer as well as to a faster strength gain (80 MPa after 24h at 80°C). Chloride diffusion coefficient, Na+ leaching as well as carbonation rate is identified on unreinforced geopolymer mortar samples. The data are used for simulations and design of the steel rebars-corrosion experiments. The effect of chloride ingress, Na+ leaching and carbonation of the geopolymer mortar on the steel-reinforcement corrosion is studied.zeige mehrzeige weniger

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Metadaten
Autor*innen:Petr Hlavacek
Koautor*innen:Gregor Gluth, Steffi Reinemann, Gino Ebell, Hans-Carsten Kühne
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Chloride transport coefficient; Geopolymer; Steel corrosion
Veranstaltung:II European Geopolymer Network
Veranstaltungsort:Madrid, Spain
Beginndatum der Veranstaltung:14.07.2017
Enddatum der Veranstaltung:14.07.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:24.07.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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