INVESTIGATION OF ALKALINE ACTIVATORS FOR FLY-ASH BASED GEO-POLYMER CONCRETE

civil engineering

Geopolymer concrete technology has the potential to reduce globally the carbon emission and lead to sustainable development and growth of the concrete industry. This study represents “Effects of alkali activators on fly ash based concretes”. The main objective of this study is to investigate different alkali activators for Geopolymer concrete and their effect on strength of fly ash based concrete. The Geopolymer concrete is the mixture of coarse aggregate, sand, fly ash and alkaline solution of Sodium hydroxide (NaOH) or Potassium hydroxide (K2SiO3) or Calcium hydroxide and sodium silicate (Na2SiO3) or Potassium silicate (K2Si) 3) or calcium silicate .This study presents the experimental investigation were total nine different trial combination of alkaline activators are used having concrete grade M30 with 8M molarity at 800 oven curing. From those, three combinations is selected for further studies as KOH + Na2SiO3, NaOH+K2SiO3 and KOH + Na2SiO3for different molarity for temperature 900. The compressive strength of Geopolymer concrete were carried out during this study and it was observed that, how different alkaline activators effect the strength of Geopolymer concrete. Also it is found that KOH+Na2SiO3 combination having maximum strength than other two combinations. Also it is found that KOH + Na2SiO3 and KOH + Na2SiO3is suitable for concrete work.

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