What is the best ratio for Alkaline Activator/Fly Ash in Geopolymer Materials?

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Pradeep Kumar Rana

It depends on type of Fly ash youare using, but mostly, 7.5-13.4 (Na2O) : 25-29.6 (SiO2) in sodium silicate is recommended.

Sanjay Kumar

In our understanding, only amorphous fraction of fly ash participates in reaction during early geopolymerisation and remaining acts as an aggregate. If there are free alkali available then the crystalline part participate in reaction which is very slow. Thus deciding a geopolymerisation reaction based on total Al2O3 and SiO2 is misleading sometimes.

Radhakrishna Krishna

0.35 - 0.4 is the best ratio

Dear Prof. S.El. Aleem Thank you

Hammad Farooe

0.5

Mohammed Haneefa Kolakkadan

May be based on flow requirements and concentration/composition of alkali solutions....