Based on a visual comparison of extracted two-dimensional images and a numerical comparison of normalized correlation functions, good agreement between the three-dimensional microstructure of real and CEMHYD3D hydrated cement pastes has been observed. The analysis has also provided insights into the increasing correlation distance observed for the unhydrated cement particles, the strong influence of sealed curing on the maintenance of a set of coarse pores in the hydrating microstructure, and the proper selection of parameters controlling the nucleation of calcium hydroxide crystals within the simulated microstructures.