TY - CONF A1 - Gluth, Gregor A1 - Lehmann, Christian A1 - Rübner, Katrin A1 - Kühne, Hans-Carsten ED - Bílek, V. ED - Kersner, Z. T1 - Influence of sodium concentration of the activating solution on the hydration of calcium carbonate-rich wastepaper sludge ash N2 - 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 as addition in alkali-activated binders. T2 - NTCC2014 - International conference on non-traditional cement and concrete CY - Brno, Czech Republic DA - 16.06.2014 KW - Wastepaper sludge ash KW - Calcium carbonate KW - Alkali-activation KW - Monocarboaluminate KW - AFm KW - Hydrogarnet PY - 2014 SN - 978-80-214-4867-4 SP - 71 EP - 74 PB - Novpress AN - OPUS4-30992 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -