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This paper focuses on the investigation of the co-utilization of two major industrial waste materials, power station fl y ash and red mud. Experimental studies were carried out to establish the correlation between the physical properties of a geopolymer product and a mixture composition. The eff ect of mechanical activation and the red mud dosage on the geopolymerisation was investigated. Geopolymerisation of mechanically activated fl y ash has been carried out with various proportions of red mud ranging between 0-30 % by weight. The compressive strength of fl y ash based geopolymer increased until 15 % of red mud addition. The optimal red mud addition in fl y ash geopolymer was determined. The infl uence of red mud on phase composition and chemical bonds of the resulted geopolymer were determined by XRD analysis and FTIR studies. Due to the geopolymerisation reactions, new phases like hydroxy-cancrinite, faujasite and thenardite appeared in the product.

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