study of strength development of high calcium fly ash based Geo-polymer concrete by using M-sand as fine aggregate
Publication Date : 08/04/2019
Ordinary Portland Cement is a major construction material worldwide. Cement manufacturing industry is one of the carbon dioxide emitting sources besides deforestation and burning of fossil fuels. The global warming is caused by the emission of greenhouse gases, such as CO2, to the atmosphere. The CO2 contributes about 65% of global warming. The Cement industry contributes globally about 5-7% of greenhouse gas emission to the earth’s atmosphere. In order to address environmental effects associated with Portland cement, there is a need to develop alternative binders to make concrete. The effort which we used is to produce more environment friendly concrete is the development of inorganic alumino-silicate polymer, called geopolymer which is synthesized from materials of geological origin or by-product materials such as fly ash that are rich in silicon and aluminum. In this project high-calcium (Class C) fly ash from Neyveli Thermal power plant has been used for the production of geopolymer concrete. The combination of sodium silicate and sodium hydroxide solution is used as alkaline solution for fly ash activation. The concentration of sodium hydroxide solution was maintained as 8M (Molarity) and also study the different properties of geopolymer concrete with replacement of manufactured sand. The curing condition of geopolymer concrete was varied as ambient curing. The compressive strength, Split Tensile Strength of the geopolymer concrete was tested at various ages such as 7, 14 and 28 days.
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