Industrial residues will be valorized and via geopolymerization turned into fire resistant materials. The waste envisioned is 'bauxite residue (also known as red mud)', bricks and tiles from construction and demolishing waste, and fly ash from biomass incineration. Most of these waste streams still don't have a decent 'high value' use. If they are not landfilled, they are downcycled. In this project, the different waste streams will be combined in the right proportions, after physico-chemical pre-treatment. The compositions of the residues are complementary in that the baxite residue is mainly an iron oxide, with some sodium, the bricks and tiles are aluminosilicates and the fly ash adds calcium (and silica and alumina) to it. Together they can be combined to an iron/aluminosilicate with a tunable amount of Ca. This mixture is then molten and quenched as a kind of slag. The result is a good precursor for geopolymers (or alkali activated cements). The blending ensures the constant composition and quality of the precursor. With the addition of Ca, the setting rate of the geopolymer can be tuned.
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