There is no general rule for the waterglass concentration.
What works best depends on the kind of pozzolan and if with or without aggregate and the kind of aggregate as well.
Grog, pure or with only small amaounts of aggregate, does not need waterglass at all.
What works well with relatively high amounts of fine aggregate may not work sufficiently with pure pozzolans.
Pure pozzolans will usually do better with higher concentrations.
Thickness does virtualy not play a role for the chemical and physical reactions,
merely for drying.
As patience never has been one of my strong points I like to use small amounts of accelerators.
In mixtures with quicklime or cement citric acid will delay hydration, thus by delaying the
accelerating effect of the calcium oxide keep it a bit longer liquid, but later accelerate geopolymerisation.
Usualy I let the mixture rest under ambient conditions for some time until it is not longer liquid
and has already gained a bit strengt before I start warm curing.
Luckily this does not take long if an accelerator has been used.
Then I cure at 50°C for about three hours and about two hours more at 75°C.
Warm curing may be continued without sealing.
Some geopolymers eg. zeolite need then to loose a significant part of the water to get really hard.
After this the temperature can be raised even more, if wished.
For very thick material one may need to add some time for warm up.
Without an accelerator I would start with curing at about 30°C.
During geling and onset of the geopolymerisation parts of the mixture may undergo
volume changes without much affecting the overal volume.
If this happens to fast, eg by starting at to high temperature, cracks may occur.
