Determination of the diffusive motion of water molecules in hydrated cement paste by quasielastic neutron scattering

摘要

The microscopic motions involved in diffusion of hydrogen containing moleculescan be most effectively studied by quasielastic incoherent neutron scattering. In this paper we reportthe results of our high resolution quasielastic incoherent neutron scattering experiment on thetranslational dynamics of water molecules contained in the structure of the cement paste. Based on theaccumulated data we try to outline the diffusion of water molecules at the microscopic level. Thespectra from the confined H2O are first analyzed in terms of half with at half maximum over thestudied Q range to obtain the diffusion constant. Age dependent dynamics of water in hydratedcement paste has been studied as function of integrated intensity.