Understanding and Mastering Coal Fired Ashes Geopolymerisation Process
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The EU regulations are restrictive with regard to solid residues and waste management. Research efforts to develop satisfying solutions are thus necessary. The GEOASH project aims, on one hand, at producing new geopolymeric matrixes using the advantageous properties of fine particles extracted from (co)-combustion fly ashes for the long-term stabilisation of inorganic hazardous wastes and, on the other, at predicting technologies for the recycling of coal ashes into added-value products which could be integrated in manufacture processes, allowing a reduction of primary resources consumption.…mehr

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Produktbeschreibung
The EU regulations are restrictive with regard to solid residues and waste management. Research efforts to develop satisfying solutions are thus necessary. The GEOASH project aims, on one hand, at producing new geopolymeric matrixes using the advantageous properties of fine particles extracted from (co)-combustion fly ashes for the long-term stabilisation of inorganic hazardous wastes and, on the other, at predicting technologies for the recycling of coal ashes into added-value products which could be integrated in manufacture processes, allowing a reduction of primary resources consumption. The new geopolymer matrixes produced at room temperature in moderate alkaline conditions display a compressive strength of 60-80 MPa that is not affected by the particle size of the starting fly ashes. High content of unburned carbon (10 %) in the fly ash inhibits the reactions. The higher the amorphous phases content in fly ashes the higher the polymerisation degree typical of the geopolymerframework.