Abstract
A mathematical model for the kinetics of geopolymerisation is presented. The model includes explicit description of a complex multistep reaction process leading to a phase-mixed product. Silicate speciation equilibria are described by relationships derived explicitly from high-resolution 29Si NMR data, and an autocatalytic polymerisation step provides good agreement with the observed kinetics of geopolymerisation. Comparisons of model predictions with data from in situ energy dispersive X-ray diffractometry are presented, and the kinetic effects of different alkali metal cations ( Na + or K + ) and of variations in SiO 2 / Al 2 O 3 ratio are seen to be described adequately by the model.
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