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Influence of sodium concentration of the activating solution on the hydration of calcium carbonate-rich wastepaper sludge ash

  • In paper recycling several types of waste sludges are produced, which contain organics as well as inorganic fillers of the recycled paper, e.g. kaolinite, calcite, talc, or titanium dioxide [1,2]. Part of these sludges is incinerated to recover energy and to reduce the volume of waste to be handled. The ashes generated in this process are commonly referred to as wastepaper sludge ash (WSA). The quantities of WSA produced are large and at present much of it is still landfilled or otherwise handled entailing costs. Depending on the composition of the recycled paper and the conditions during processing and incineration, WSA can have cementitious properties. In the present investigation a CaC03-rich WSA was analyzed for reaction products and strength development after hydration with water, 2 M NaOH solution and 8 M NaOH solution. The rationale for activating the WSA with NaOH was to assess the behaviour of the WSA when alkalis are introduced to the System or when the WSA is used asIn paper recycling several types of waste sludges are produced, which contain organics as well as inorganic fillers of the recycled paper, e.g. kaolinite, calcite, talc, or titanium dioxide [1,2]. Part of these sludges is incinerated to recover energy and to reduce the volume of waste to be handled. The ashes generated in this process are commonly referred to as wastepaper sludge ash (WSA). The quantities of WSA produced are large and at present much of it is still landfilled or otherwise handled entailing costs. Depending on the composition of the recycled paper and the conditions during processing and incineration, WSA can have cementitious properties. In the present investigation a CaC03-rich WSA was analyzed for reaction products and strength development after hydration with water, 2 M NaOH solution and 8 M NaOH solution. The rationale for activating the WSA with NaOH was to assess the behaviour of the WSA when alkalis are introduced to the System or when the WSA is used as addition in alkali-activated binders.zeige mehrzeige weniger

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Autor*innen:Gregor GluthORCiD, Christian Lehmann, Katrin RübnerORCiD, Hans-Carsten KühneORCiD
Persönliche Herausgeber*innen:V. Bílek, Z. Kersner
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):NTCC2014 - International conference on non-traditional cement & concrete V (Proceedings)
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):Brno University of Technology
Verlag:Novpress
Erste Seite:71
Letzte Seite:74
Freie Schlagwörter:AFm; Alkali-activation; Calcium carbonate; Hydrogarnet; Monocarboaluminate; Wastepaper sludge ash
Veranstaltung:NTCC2014 - International conference on non-traditional cement and concrete
Veranstaltungsort:Brno, Czech Republic
Beginndatum der Veranstaltung:16.06.2014
Enddatum der Veranstaltung:19.06.2014
ISBN:978-80-214-4867-4
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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