I have two questions.The first is, is a proportion of water taken to the binder in the geopolymer industry, as in ordinary concrete, or do we rely only on additional water, hydroxide water, and silicate water?Is the superplasticizer taken as a percentage of the binder or something else? as in ordinary concrete, or do we rely only on additional water, hydroxide water, and silicate water?Is the superplasticizer taken as a percentage of the binder or something else?
Dear Raheem,
you are wronging the fundamentals of geopolymerization.
To change the workability of every GP material you must understand how happened the reactions. So check your raw materials and learn about the mixing method that are completely different from OPC technology or from every alkali activated materials, that are still hydraulic so can have some feature close to the Portland recipes. GP are mineral polymers without crystal water inside.
Only very few admixtures work with GP materials but to fluidize at best can be used a proper balancing of the precursor and few % of extra water maintaining in this way under control (very low) the shrinkage.
No additives are necessary for having self compacting and water to something ratio are numbers with no importance. Can be evaluated a ratio between liquid reagent (alkaline or acid for GP the selection depend only on the costs and because of the application) and precursor in powder to know just how fine and reactive is that specific precursor but isn’t connected to hardening time, mechanical strength development or other important parameters.
Check at www.geopolymer.org for more detailed informations it’s the site where write directly Professor Davidovits the father of Geopolymer Technology.
Best regards
Alex Reggiani
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