Too less or too much alkali-activator is bad for the geopolymer,but how to determine the right amount and through what way?
You can only do it by trials. Because every source materials has different chemical characteristics and will leach differently. Also the type of alkali cation is important. In the presence of KOH the leaching could be higher than NaOH. But again it all depends on the type of source materials you are using for your geopolymerization. You may find some guideline in the literature for your specific kind of source material and chemical composition. Hope this helps.
Dear Xinyu Kan, the chemistry of geopolymers tells us that there should be one alakli metal atom for one aluminium. So by keeping the Na:AL molar ratio of 1:1 is more suitable in class F-fly ash and Metakaolin based geopolymers. In case of steel slag, blast furnace slag or other low alumina and silica containing precursors, you must work on different ratios.
A. B. M Amrul Kaish I would like to know how is the H2O to Na2O ratio calculated? I went through the documents you have put...but havent been able to understand this ratio. So can you help me out in this regard?
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