Development of paving blocks from synergistic use of red mud and fly ash using geopolymerization

► Red mud and fly ash mix has been used for ambient temperature geopolymerization. ► Red mud addition enhanced the intensity of reaction and structural reorganization. ► Improvement in physical properties can be ascribed to compact microstructure. ► Paving blocks with 10-20% red mud meets IS 15658 specification. ► The paving blocks are environmentally safe in terms of leaching of toxic metals.