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One of the circular economy’s principals is to «keep products and materials in use». Geopolymerization technology is promising enough to support this principle as it exploits wastes and by-products as alternative raw materials streams. However, the challenge that must be overcome to commercialize geopolymers is the substitution of the caustic alkaline solution that activates the aluminosilicate raw material. The introduction of solid activators in the process has given great results. This paper deals with the synt...