The Parrot and Killoh model 56 modified by Lothenbach et al. was used to compute the degree of hydration (DoH) evolution of a C 3 S paste over time with a water-to-solids ratio of 0.5. The output of the model was then taken as input (GEMS version 3 software ), coupled with the CEMDATA18 thermodynamic database to compute the phase (C-S-H, CH) at each time step. While several assumptions are made in this calculation, the model provides a rough overview of the relative proportions of anhydrous C 3 S and hydrates at different DoH, which was then used to generate Ca NMR spectra of these systems.