Mechanical Properties of High Calcium Flyash Geopolymer Concrete with Metakaolin Blend

In the present study, the Portland cement was fully replaced with high calcium fly ash to produce the geopolymer concrete. Alkaline liquids were used in different combination in the source material. The alkaline liquids used in this study for the polymerization was sodium hydroxide (NaOH) and sodium silicate (Na2SiO3).High calcium fly ash was partially replaced by metakaolin blend by 0%, 25%, 50%, 75% and 100%. Ambient curing was given to the mortar specimens. Based on many trials on compressive strength of high calcium flyash geopolymer mortar at 3, 7, 28 days, the optimum mix combination was chosen. Upon the optimum mix combination compressive strength was determined. Test results depict that high calcium fly ash geopolymer mortar specimen’s attained higher compressive strength at 75% replacement of metakaolin. Compressive strength, split tensile strength, flexural strength of concrete specimens to determine by 75% replacement of metakolin.