We investigated the translational dynamics of water molecules in the hydrated aluminate and aluminum-ferrite pastes (C 3 A and C 4 AF), two main components of the Ordinary Portland Cement (OPC), using the incoherent quasi-elastic neutron scattering (QENS) technique. We used a high-resolution disk chopper spectrometer (DCS) at the Center For Neutron Research (NCNR) in NIST, with incident monochromatic neutrons of wavelength, λ = 9 A, resulting in an energy resolution of 20 μeV, covering a Q-range from 0.31 to 1.22 A - 1 . QENS spectra have been analyzed with a translational relaxing cage model previously developed by us. 1 We were able to extract time evolution of three characteristic parameters of the setting pastes: p, β, and τ, describing the fraction of the bound water (p) and relaxation behavior of the glassy water (β and τ) present in the aluminate pastes during the last stage of the reaction kinetics. These parameters, obtained for the first time for C 3 A and C 4 AF, show striking difference from that obtained in previous experiments for calcium silicate pastes (C 2 S and C 3 S).