where the apparent equilibriumconstant given is the undersaturation at
which the measured rate vanishes, which differs greatly from the true
equilibriumconstant for dissociation of anhydrous C3S (ln K ~ 0), possibly
because of surface hydroxylation in water [4,29]. The equilibrium
constant for anhydrous C3S appears to have little bearing on the kinetic
behavior of dissolution, as demonstrated by Nicoleau et al. [4].
HydratiCA incorporates H3SiO4
− and H2SiO4
2−, but not H4SiO4, as the
silicate components in solution. However, reaction (3) can be transformed
using the silicate speciation reaction [30],