EXPERIMENTAL INVESTIGATION OF CONCRETE BY USING ALKALI ACTIVATED ALUMINO SILICATES
Publication Date : 23/03/2020
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Concrete is the one of the world’s most durable, reliable, and versatile construction material. Concrete is the most used construction material, which required large quantity of Portland cement. Production of Ordinary Portland cement is second to the automobile manufacturing which is the major generator of carbon di oxide, which pollutes the atmosphere. In addition to that, large amount of energy was also consumed during the production of cement. Hence, it is very essential to find an alternative material to the existing most expensive, most resource consuming Portland cement. Geopolymer concrete utilizes a material such as fly ash as a binding material in place of cement. Fly ash, a byproduct of coal obtained from the thermal power plant is available in plenty worldwide. Fly ash, rich in silica and alumina react with alkaline solution and produce Alumino silicate gel that act as the binding material for the concrete. It is an excellent alternative construction material to the existing plain cement concrete. Since geopolymer concrete is the emerging field, an attempt has been made to find out the behavior of geopolymer concrete along with the use of quarry dust as fine aggregate. In this project complete replacement of cement by ASTM Class F fly ash and complete replacement of sand by quarry dust were used in M20 concrete mix. The parameter considered in our project is the molarity of alkaline activator. The grade chosen for the experiment is M20. The mixes were designed for molarity of 10M, 12M, and 16M. The alkaline solution used is the combination of sodium hydroxide and sodium silicate solution with the ratio of 2.50. Concrete specimens were prepared and cured under ambient temperature. The experimental program involves casting of geopolymer concrete specimens and testing the same at different ages of compressive strength.
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