Influence of Al and Si Oxides in Geopolymer Nano-Silica Composite

Abstract

Geopolymerization is a chemical process in Geopolymer concrete, which involves under the alkaline condition with Si and Al minerals, it brings in a 3D polymeric chain and ring structure brings of Si-O-Al-O-Si bonds. Geopolymer concrete is an innovative material that is characterized by long chains or networks of inorganic molecules. It is a potential alternative to conventional Portland cement concrete for use in construction. In this paper, the examination concerns the utilization of an ideal mix of pozzolanic material such as Ground Granulated Blast furnace Slag (GGBS) with an alkaline solution as the binder. Moreover, Metakaolin which is rich in silica and aluminum is added as an admixture to increase the strength of the Geopolymer concrete. In addition, Nano-silica is utilized to decrease the pores and boosts the strength of geopolymer concrete. The Chemical composition of the materials, mixing proportions and curing methods play an important role in the development of strength and influence the rate of polymerization. 30 mixes were outlined at different extents such as 10%, 20%, 30%, 40% and 50% of Metakaolin and 0.5% and 1% of Nano-silica at ambient curing. It is observed that the result of compressive strength at 30% of Metakaolin and 0.5% of Nano-silica gives high strength. At the same combination, the chemical analysis also revealed an increase in the strength of concrete with this level of Silica and Alumina content.