A Study on the Effect of Oxide Compositions on the Compressive Strength Characteristics of Geopolymer Concrete

The present study deals with investigating the influence of oxide compositions (viz., SiO₂, Al₂O₃, Fe₂O₃, CaO) on the mechanical behaviour of geopolymer concrete made of fly ash. The study has been carried out employing the extensive data collected from the literature. Trends between 7 and 28 day compressive strengths versus individual oxide composition were developed using the data. In general, the strength of geopolymer concrete found varying greatly with the individual oxide composition and its content. It has been particularly observed that the final compressive strength of concrete is predominantly influenced by SiO₂ and Al₂O₃ contents as compared with CaO and Fe₂O₃ contents, which showed an insignificant effect. As such, results demonstrate that oxide compositions can influence the mechanical behaviour of geopolymer concrete to a greater extent.