Strength characteristics of Flyash and metakaolin based geopolymer concrete
Keywords:
Geopolymer concrete, PCC, Alkaline solution, NaOH, Na2Sio3, flyash, metakaolin, cement(OPC 43 grade), compressive strength.Abstract
The major problem in the world is facing today is the environmental pollution. In the construction industry mainly the production of Portland cement will causes the emission of pollutants results in environmental pollution. We can reduce the pollution effect on environment, by increasing the usage of industrial by-products in our construction industry. Geopolymer concrete is such a one and in the present study, to produce the geo-polymer concrete the Portland cement is fully replaced with fly ash & metakaolin are used for the binding of materials. This paper presents the strength characteristics of Flyash and metakaolin based geopolymer concrete with different proportion of binder and molarities. The alkaline liquids used in this study for the polymerization are the solutions of Sodium hydroxide (NaOH) and sodium silicate (Na2Sio3). Different molarities of sodium hydroxide solution i.e. 10M, 12M and 14M are taken to prepare different mixes and the compressive strength is calculated for each of the mix. There are 60 cube specimens are taken of size 150mm x 150mm x 150mm. The Geopolymer concrete specimens are tested for their compressive strength at the age of 7days and 28 days. They are curing by oven at 600C for 24 hours then after ambient temperature. The test results presented in this paper show the strength of Geopolymer concrete based on fly ash and metakaolin with increase the molarities of sodium hydroxide (NaOH) and also comparable with that of Ordinary portland cement concrete.
