The effect of adding several types of industrial wastes to fly ash based geopolymers hasbeen studied. For that, flexural and compression strengths were evaluated at 7 and 28 daysafter curing. From the obtained results it seems that the incorporation of stone cutting sludgehas some beneficial effect on the measured mechanical properties. However, theincorporation of ceramic wastes from ferrous foundry operations seems detrimental. Theseare preliminary results, further works being necessary to confirm these relationships.
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