... ABSTRACT Red mud is a waste material obtained from the aluminium extraction industry with the Bayer process and million of tons of red mud are produced annually. Fly ash is the finely divided ... physico- mechanical properties and manufacruring process of the unfired brick using fly ash and red mud through geopolymerization process with the aim of finding a new material that is appropriate ... that red mud contains silica, aluminum, iron, calcium, titanium.., etc. The variation in chemical composition between different red muds is high. Figure 1. Red mud from...