Activator solutions for geopolymers are most stable when used warm within about 1 to 1.5 minutes after mixing water, NaOH and sodium silicate in that order, and cooling can push them into an unstable, gelled state.
This significantly reduces the ≥ 24-hour preparation times commonly cited in the geopolymer literature, enabling faster and more efficient mixing procedures and process control
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Optimisation of Activator Solutions for Geopolymer Synthesis: Thermochemical Stability, Sequencing, and Standardisation
Activator solutions for geopolymers are most stable when used warm within about 1 to 1.5 minutes after mixing water, NaOH and sodium silicate in that order, and cooling can push them into an unstable, gelled state.