How to calculate a,b, c coefficient using si/al and ca/(si+Al ) ratio?
Example-
ca/(si+al) ratio are 0.1, 0.2 and 0.3 also si/al ratio are 2.5,3.0,3.5,4.0,4.5
"a" coefficient are 9.06,3.24,-2.58,-8.4,-14.22 respectively.
Dear Bhupesh,
to understand how to balance every Geopolymer binder and how to select the correct molar ratio depending on the type of alkali ion used you must read the book of prof. Davidovits at chapter 21. Will be your best investment to know about Geopolyme technology. You will also understand that Ca/(Al+Si) ratio is useless parameter because geopolymerization is polymer process not hydraulic like for alkali activated materials AAMs aren’t polymers so aren’t the same of Geopolymers.
Concrete remains an application with coarse aggregates and low amount of binder but you need to learn before the mix design that for GP is different from Portland and AAMs.
Geopolymerization is promoted by Si/Al ratio so different values bring to completely different hardened materials and performances. There are several raw materials that can be used and even the aggregates should be taken from partially reactive minerals (calcium carbonate and silica sand are inert in GP systems).
But again, to understand what does it means reactive or partially reactive minerals used as aggregates you must study the book Geopolymer - Chemistry & Applications that you can buy on www.geopolymer.org in the shop area.
All the best
Dr. Alex Reggiani
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