Special Issue Article Open Access

Fly Ash Based Geopolymer Concrete

Abstract

A concrete use around the world is second only to water. The production of ordinary Portland cement contributes 5-7% of total green house gas emission. It also consumes large amount energy .Hence it is essential to find alternative to cement. Fly ash is a byproduct of coal obtained from thermal power plant. It is also rich in silica and alumina. In this paper, fly ash is used to produce a geopolymer concrete. Geopolymer is a material resulting from the reaction of a source material that is rich in silica and alumina with alkaline solution. Geopolymer concrete is totally cement free concrete. In geopolymer, fly ash act as binder and alkaline solution act as an activator. Fly ash and alkaline activator undergo geopolymerization process to produce alumino silicate gel. Alkaline solution used for present study is combination of sodium hydroxide (NaOH) and sodium silicate (Na􀀀Sio􀀀) with ratio 2.5. A grade chosen for the investigation were M40.The mix were designed for molarity of 12M, 14M and 16M. The test results have shown that compressive strength increases with increase in molarity.

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