Comparison of Compressive Strengths for Different Alkaline Liquid to Binder Ratio on Geopolymer Concrete under Ambient Curing

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A. Krishna Rao, D. Rupesh Kumar


The geopolymer concrete is an environmental friendly material in the sense that it uses the industrial by products such as Ground Granulated Blast furnace Slag and Fly Ash, along with alkaline activated solutions. The commonly used combination of alkaline activator solution is NaOH and Na2SiO3. The silica byproducts form with alkaline solution a binder matrix to bind aggregate in the mixture and to produce the hardened concrete. There are two main constituents of geopolymer, namely the source materials and the alkaline liquids. The source materials for geopolymer based on alumina-silicate should be rich in silicon (Si) and aluminum (Al). These could be natural minerals such as kaolinite, clays, etc. Alternatively, by-product materials such as Fly Ash, silica fume, slag, rice-husk ash, red mud, etc., could be used as source materials. The materials required for Geopolymer Concrete may be chosen by their availability, cost and other structural requirements. The mixture of Sodium hydroxide and Sodium Silicate is usually employed as alkaline activator for the Geo-polymerization. In this study alkaline to binder ratio is used 0.3 and 0.35, and mass of sodium silicate to sodium hydroxide as 2.5, total combined aggregate is considered as 70% for molarity of NaOH is 8, partially replaced fly with GGBS is 40% with an increment of 10% and under ambient curing condition. The investigations are carried out for compressive strength, flexural strength and split tensile strength.

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